GSM BSS Swap Guide-20060430-A-1.0
For internal use only
Document
Product
number
number Product
Intended for Edited for
GBSS
engineers
and
GSM RNO engineers GSM Product/RNO GEO
GSM BSS
version Document number
GSM BSS Swap Guide Prepared by Reviewed by
Chen Xinting, Yang Jie, Fan Kai, and Yi Hongwei Si Fazhong, etc.
Date
2006-03-02
Date
Reviewed by
Date
Approved by
Date
Huawei Technologies, Co., Ltd. All rights reserved
2016-07-05
HUAWEI Confiential
Page 1 of 112
GSM BSS Swap Guide
For internal use only
Revision Record Data
Revision Version
Version Description
Author
2006-02-22
V1.0
Initial Version
Chen Xinting, Yang Jie, Fan Kai, and Yi Hongwei
2016-07-05
HUAWEI Confidential
Page 2 of 112
GSM BSS Swap Guide-20060430-A-1.0
For internal use only
Table of Contents Chapter 1 Swap Principle and Strategy..............................................................................................8 1.1 Huawei Network Swap Experience........................................................................................... 8 1.2 General Swap Principle........................................................................................................... 9 1.3 Swap Implementation Strategy................................................................................................. 9 1.4 Swap Procedure...................................................................................................................... 9 Chapter 2 Network Information Collection and Evaluation..............................................................13 2.1 Network Information Collection............................................................................................. 13 2.1.1 Basic Information of the Original Network...................................................................13 2.1.2 Basic Needs and Functions of the Original Network.......................................................18 2.1.3 Basic Equipment Information of the Original Network...................................................19 2.1.4 RNP Data of the Original Network...............................................................................23 2.1.5 Core Network KPI of the Original Network..................................................................25 2.1.6 Transmission Networking Information of the Original Network......................................26 2.1.7 Power Supply Configuration of the Original Network....................................................28 2.1.8 Abnormal Network Information and Customer Complaints.............................................29 2.1.9 Customers’ Engineering and Maintenance Capability.....................................................29 2.1.10 Acceptance Information............................................................................................ 30 2.2 Analysis and Evaluation of the Original Network.....................................................................30 2.2.1 DT Evaluation............................................................................................................ 30 2.2.2 Network KPI Evaluation............................................................................................. 31 2.2.3 Other Evaluations....................................................................................................... 32 2.2.4 Confirmation of the Acceptance Indicators after Network Swap......................................36 Chapter 3 Project Survey, Equipment Installation and Test..............................................................36 3.1 Survey and Design................................................................................................................ 36 3.1.1 Survey of BSC/PCU Room......................................................................................... 37 3.1.2 BTS Survey............................................................................................................... 39 3.1.3 M2000 Survey........................................................................................................... 43 3.1.4 Project Design............................................................................................................ 44 3.2 Hardware Installation............................................................................................................ 45 3.2.1 Goods Preparation...................................................................................................... 45 3.2.2 BSC Installation......................................................................................................... 46 3.2.3 Huawei PCU Installation............................................................................................. 46 3.2.4 BTS Installation......................................................................................................... 46 3.2.5 M2000 Installation..................................................................................................... 48 3.2.6 Removing the Equipment of the Original Network.........................................................48 3.3 GBSS Test........................................................................................................................... 48 3.3.1 BSC Test Points......................................................................................................... 48 3.3.2 CDB/CBC Test.......................................................................................................... 49 3.3.3 PCU Test................................................................................................................... 50 3.3.4 BTS Test................................................................................................................... 51 3.3.5 M2000 Test................................................................................................................ 52 3.3.6 Equipment Function Acceptance..................................................................................53 Chapter 4 Network Swap Planning and Network Parameters...........................................................54 4.1 Network Swap Planning........................................................................................................ 54 4.1.1 Whole Network Planning............................................................................................ 54 4.1.2 Network Swap Planning Data Design...........................................................................57 4.1.3 RNP Data Review...................................................................................................... 61 4.2 Network Interconnection Parameter Confirmation....................................................................61 4.2.1 A-interface Interconnection Parameters.........................................................................61 4.2.2 Gb-interface Interconnection Parameters.......................................................................63 4.3 Customer Suggestion............................................................................................................ 64
2016-07-05
HUAWEI Confiential
Page 3 of 112
GSM BSS Swap Guide
For internal use only
Chapter 5 Network Swap Preparations............................................................................................ 65 5.1 Network Swap Solution Design and Review............................................................................65 5.1.1 Overall Swap Solutions............................................................................................... 65 5.1.2 Designing and Reviewing the Solutions Used to Swap Network Elements........................65 5.1.3 Swap Plan and Customer Confirmation.........................................................................66 5.2 Network Swap Preparations................................................................................................... 66 5.2.1 Coordination Meeting and Customer Cooperation..........................................................66 5.2.2 Integration Difficulty Analysis and Emergency Measures...............................................67 5.2.3 Personnel Arrangement, Vehicle Arrangement, Test Tool, Installation Tool, Equipment Preparation, and Emergency Measure....................................................................................67 5.2.4 Version Confirmation and License Application..............................................................70 5.2.5 Swap Data Design and BTS Swap Preparation..............................................................71 5.2.6 Pre-integration........................................................................................................... 73 Chapter 6 Swap Implementation...................................................................................................... 75 6.1 Network Integration on the Swap Day.....................................................................................75 6.1.1 Network Integration Schedule......................................................................................75 6.1.2 Checking Each Network Element (Before Integration)...................................................77 6.1.3 BSC Integration......................................................................................................... 78 6.1.4 MSC-Related Work during BSC Integration..................................................................79 6.1.5 BTS Integration.......................................................................................................... 80 6.1.6 PCU Integration......................................................................................................... 84 BSC overall performance measurement............................................................................................ 84 G-Abis interface performance measurement.....................................................................................84 Pb interface performance measurement............................................................................................ 84 6.1.7 Network Optimization Arrangement.............................................................................85 6.2 Emergency Measures and Changback for Network Integration..................................................85 6.2.1 Emergency Measures.................................................................................................. 85 6.2.2 Changeback Principle Description................................................................................86 6.2.3 Changeback Measures................................................................................................ 87 6.3 Network Monitoring on the Day Next to Swap.........................................................................87 Chapter 7 After-Swap Network Quality Monitoring and Optimization.............................................88 7.1 Online Equipment Problem Handling......................................................................................88 7.1.1 Hardware Problem Handling.......................................................................................88 7.1.2 Complaint Handling................................................................................................... 89 7.1.3 Alarm Analysis........................................................................................................... 89 7.2 Network Monitoring and Optimization....................................................................................90 7.2.1 OMC Traffic Statistics Analysis...................................................................................90 7.2.2 Analysis of NSS-Related Radio Indicators....................................................................92 7.2.3 Analysis of Area DT and CQT and Related Suggestions.................................................93 7.2.4 After-Swap Network Maintenance................................................................................93 7.2.5 Network Optimization................................................................................................ 93 7.3 Customer Communication..................................................................................................... 94 Chapter 8 Swap Acceptance and Document Transformation............................................................94 8.1 Preliminary Acceptance......................................................................................................... 94 8.2 Network Performance Acceptance.......................................................................................... 94 8.3 Document Transformation..................................................................................................... 95 Chapter 9 Swap Risk Analysis......................................................................................................... 95 9.1 Network Information Collection and Risk Evaluation...............................................................95 9.1.1 Risks Caused by Inadequate Understanding of the Performance of the Original Equipment95 9.1.2 Risks Caused by Inaccurate Information.......................................................................95 9.1.3 Case Study................................................................................................................ 96 9.2 Project Survey, Equipment Installation and Commissioning......................................................98 9.2.1 Interconnection Risks................................................................................................. 98 9.2.2 Problems Related to Interconnection of GBSS and G9...................................................98 9.2.3 Risks Concerning BTS Survey.....................................................................................98 9.2.4 Quality Risks Caused by Project Installation Team’s Engineering Level...........................99 9.2.5 Version Risk.............................................................................................................. 99 2016-07-05
HUAWEI Confidential
Page 4 of 112
GSM BSS Swap Guide
For internal use only
9.2.6 Case Study.............................................................................................................. 100 9.3 Network Planning and Optimization Risk..............................................................................101 9.3.1 Risk Related to Network Indicators............................................................................101 9.3.2 Coverage Risk.......................................................................................................... 102 9.3.3 Inadequate Test before Swap.....................................................................................102 9.3.4 Frequency Planning Risk........................................................................................... 103 9.3.5 Risk Related to Traffic Volume..................................................................................103 9.3.6 Case Study.............................................................................................................. 103 9.4 BSS Integration and Monitoring Risk....................................................................................104 9.4.1 Risk Relate to BSS Integration Solution......................................................................104 9.4.2 Risk Related to BTS Pre-integration...........................................................................105 9.4.3 Risk Related to Transmission Commissioning.............................................................105 9.4.4 Risk Related to BTS Integration.................................................................................105 9.4.5 Emergency Problems Related to BSC Integration........................................................106 9.4.6 Handling of Abnormal Conditions during BTS Integration............................................106 9.4.7 Case Study.............................................................................................................. 107 9.5 Acceptance Risks................................................................................................................ 108 9.5.1 Risk Related to Customer Communication..................................................................108 9.5.2 Risk Related to Acceptance Test before Integration......................................................108 9.5.3 Case Study.............................................................................................................. 109 9.6 Non-technical Risk Analysis................................................................................................ 109 9.6.1 Risk Related to Contract Items...................................................................................109 9.6.2 Risk Related to Project Duration Risk.........................................................................109 9.6.3 Management Risk..................................................................................................... 110 9.6.4 Risk Related to Communication.................................................................................111 9.6.5 Risk Related to Contract Implementation....................................................................111 9.6.6 Risk Related to Work Flow........................................................................................ 112 9.6.7 Case Study............................................................................................................... 112 Appendix: Reference Document Catalog and Network Integration Checklist...................................114 9.7 Reference Document Catalog............................................................................................... 114 9.8 Network Integration Checklist..............................................................................................114 9.8.1 BSC Service Test...................................................................................................... 114 9.8.2 GPRS Dialing Test Checklist.....................................................................................115 9.8.3 A-interface Dialing Test Checklist..............................................................................116 9.8.4 Abis Interface Dialing Test Checklist..........................................................................116 9.8.5 BTS Radio Channel Dialing Test Checklist.................................................................117
2016-07-05
HUAWEI Confidential
Page 5 of 112
GSM BSS Swap Guide
For internal use only
GSM BSS Swap Solution (Template) Key words: swap, integration, GBSS, network optimization Abstract: Compared with the swap documents edited before, this document describes the whole swap procedures based on the swap experience of the current GBSS (the version is BSC32). As with this version, the focuses are on the introduction of the specific swap implementation from the perspective of engineering and the differentiation of the engineering scenarios. In addition, this document also provides the tips on how to control network quality and what should be paid attention to (especially the coverage and parameters) during swap. Furthermore, this document gives the risk analysis and related cases for your reference. In a word, this document can help you improve work efficiency, avoid unexpected problems, reduce technical requirement on engineers, and ensure swap quality.
2016-07-05
HUAWEI Confidential
Page 6 of 112
GSM BSS Swap Guide
For internal use only
Preface What are the characteristics of this document?
Whole swap procedures are described in this document and the focuses are given to four aspects, including network information collection and evaluation, network optimization, swap implementation, and risk analysis.
The differentiation of the original network information is available and the information collected according to the forms provided in this document can meet swap requirement.
Engineering scenarios and detailed swap steps are provided.
Risk analysis and many cases are available.
Delivery according to contract is appreciated.
Control of network swap quality is emphasized.
Swap cases are updated.
How to use this document? Network swap is a systematic project, so it must be implemented according to steps. More importantly, good planning and network monitoring are necessary.
This document consists of several chapters, but the actual swap process can be divided into three parts, including network information collection (Chapter 1, 2, and 3), swap implementation (Chapter 4, 5, and 6), and network monitoring and acceptance (Chapter 7 and 8).
Collecting and evaluating the information of the original network is the most important for a successful swap. Therefore, the earlier to provide technical service and use this document, the better for the network swap. Generally, this document must be used after contract signature but before network swap so that the network information collection and evaluation can be finished as soon as possible.
The parts for survey, installation and commissioning, and integration preparation are for the implementation engineers’ reference.
This document can be used as the template of network swap and integration during the implementation of a swap project.
The parts for RNP and RNO are for the RNO engineers’ reference.
The parts for risk analysis are for project engineers’ reference.
Note: In this document, the “original network” refers to the network need to be swapped but has not been swapped.
2016-07-05
HUAWEI Confidential
Page 7 of 112
GSM BSS Swap Guide
For internal use only
Chapter 1 Swap Principle and Strategy At present, the GSM technology is mature than ever before, and so is the market competition. Therefore, GSM network swap, especially the swap of the base station system, will surely become the trend. The GSM network swap is a complex systematic project for the following considerations:
Multiple operators’ equipments are involved.
The features of the equipments vary with operators.
The network structure will change after swap.
The quality of the swap implementation must be ensured.
The cooperation of different operators’ equipments must be available.
The RNP and RNO level is a great concern during network swap.
The performance of various equipments may be greatly different in the same geographic environment.
As a leading GSM equipment provider in the world, Huawei has swapped multiple operators’ networks and has acculturated rich experience. Hereunder lists several examples and gives a general description of the swap strategies.
1.1 Huawei Network Swap Experience Huawei GSM system has been widely used in the worldwide. By December 2005, Huawei has swapped 300, 000 TRXs and more than 50,000 BTSs and the equipments of many world-honored operators are involved, including Motorola, Siemens, Ericsson, Nokia, Bell, Alcatel, Nortel, Lucent, etc. Huawei has accumulated rich experience in network swap through these projects, among which the major projects are listed in Table 1.1. Table 1.1 Major swap projects implemented by Huawei Country or region
Operator
Equipment
provider
of
the
Swap scale
original network Philippines
Digitel
Alcatel
5893TRX
Nigeria
MTN
Ericsson
4795TRX
Liaoning Province
Unicom
Lucent
6241TRX
Indonesia
Indosat
Siemens
4552TRX
Sichuan Province
China Mobile
Ericsson
4505TRX
Colombia
Movil
Siemens
1300TRX
Guangdong
China Unicom
Motorola
4405TRX
2016-07-05
HUAWEI Confidential
Page 8 of 112
GSM BSS Swap Guide
For internal use only
Zhejiang
China Unicom
Nortel
870TRX
Fujian Province
China Mobile
Nokia
3000TRX
Inner Mongolia
China Mobile
Nokia
1065TRX
Note:
Actually, multiple network elements, such as MSC, HLR, and GPRS part, are involved in GSM network swap. In this case, you should swap the core network part, and then swap the base station part.
If network expansion and construction should be performed during the swap, you should swap the network first so that the smooth transition of the network can be ensured.
The network indicators must be consistent with that specified in the contract for delivery.
1.2 General Swap Principle The swap of the GBSS is the same as that of other network elements and the following four principles should be followed:
Security
Excellent quality and low cost
Smooth transition
High efficiency
1.3 Swap Implementation Strategy From the perspective of the effect against the network, the following strategies can be used for GBSS swap.
Parallel swap
One-time swap
Batch swap (recommended)
Mixed swap
1.4 Swap Procedure This document introduces the whole swap procedures, including network information collection and evaluation, equipment installation and commissioning, network swap planning, integration solution design, swap preparation, integration preparation, after-integration test and optimization, and swap acceptance. The key tasks are network information collection and swap implementation. Figure 1.1 shows the whole network swap procedure.
2016-07-05
HUAWEI Confidential
Page 9 of 112
GSM BSS Swap Guide
For internal use only
Start, contract information
Communicate with customers , make contract and technical proposal
Netw ork information collection
Basic information of the original network/ basic need and function/equipment information/RNP data/core network KPI/ transmission networking/power supply configuration/abnormal network information and customer complaint/customers' engineering and maintenance capability/ acceptance standards
Analysis and evaluation of the original netw ork
DT test/KPI evaluation/CQT for VIP area/ GPRSCQT and GPRS DT test/external interference test/CW test/simulation/MOS test/coverage comparison test
Project survey and design
BSC/PCU/BTS/project design file for M2000/survey report
Goods preparation, shipment, transportation, customs clearance, storage, goods distribution
Hardware installation
Install g temporary BTS
Install BSC/PCU/M2000
Transmission adequate or not ?
N
Install BTS equipment
Cabinet installation space adequate or not?
Allocate temporary transmission resource
N
Temporary
N
installation space?
Y
Y Y Constructing new power supply?
Hardw are installation completed
N
Y BSC/PCU hardw are check, acceptance, pow er-on test, hardw are status
Constructing new antenna
N
Y Hardw are installation completed
BSC/PCU commissioning
Connect to core netw ork
Joint debugging w ith BSC
Y
BTS transmissio qualified or not?
N
BTS off-line test
Acceptance test for various functions, services, and BSC/PCU equipment
Netw ork sw ap implementation
2016-07-05
HUAWEI Confidential
Page 10 of 112
GSM BSS Swap Guide
For internal use only
Netw ork sw ap implementation
Netw ork sw ap planning
Total netw ork planning/after-sw ap acceptance/sw ap RNP data design/planning data review /interconnection parameter confirmation
Sw ap solution design
General network swap solution/design and review for the swap solutions to network elements/integration plan and customer confirmation
Sw ap preparation
Integration coordiination and affairs needing customers' cooperation/analyzing integration difficulties and making emergency measures for integration failure/ personnel arrangement, vehicle arrangement, test tool, installation tool, spare part preparation and emergent measures/data preparation
Pre-integration or not?
Y
Pre-integration
Test passed or not?
N
N
Failure processing
Y Transmission confirmation
The transmission at the A/A-sub/Abis/Pb/Gb interfaces need to be confirmed.
BSC integration Is each network element normal before integration？
N
Failure processing
Y BSC A-interface integration
Does BSC run normally?
A-interface dialing test table/netw ork element status check/traffic statistics registration
N
Failure processing
Success or not?
N
Changeback of the data of the original BSC
Y
End
Y Shut dow n the original BTS
BTS integration
Remove the original BTS
Package the orginal cabinet properly
Install new cabinet, pow er-on check the hardw are
Focus attention on checking TRX transmit pow er
Transmission system integration
BTS on-line test
Focus attention on testing TRX call and service
Antenna and feeder system integration
Focus attention on testing standing-to-w ave ratio
2016-07-05
HUAWEI Confidential
Page 11 of 112
GSM BSS Swap Guide
For internal use only
The test contents include signal strength, Ec/Io, interference indicators, and site distance
Field DT acceptance
Analyze test results and check BTS running state
Success or not?
N
Y
Failure processing
Success or not?
N
Change back to the original BTS
Y
End
Integration completed
Netw ork quality monitoring and optimization after sw ap
Process equipment problems online
Equipment failure processing/complaint processing/alarm analysis
Netw ork evaluation
KPI analysis: voice KPI analysis/packet service KPI analysis/NSS-side indicator analysis/DT analysis/CQT analysis
Netw ork optimization adjustment
N Meet the requirement specified in contract or not?
Y Sw ap acceptance/documentation handover
End
Figure 1.1 Whole network swap procedures
2016-07-05
HUAWEI Confidential
Page 12 of 112
GSM BSS Swap Guide
For internal use only
Chapter 2 Network Information Collection and Evaluation Engineering capability is the key to the success of a swap project. To improve work efficiency and thoroughly understand customers’ needs, you should collect the related network information beforehand. This chapter introduces the information needed to be collected before swapping a network. You can obtain the data through contract review, customer communication, field test, etc.
2.1 Network Information Collection The following information of the original network must be collected:
Basic information of the network
Basic needs and functions
Basic information on the operation of online equipment
RNP data
Transmission and networking information
Information of power supply configuration
Abnormal network information and customers’ complaints
Customers’ engineering and maintenance capability
2.1.1 Basic Information of the Original Network I. Network Structure of the Original Network The network structure of the original network should contain the basic information of the main equipments, such as the MSC, BSC (PCU), and the overall BTS layout. If packet service is available in the original network, the information of the packet equipments, such as SGSN and GGSN, should be included. If the core network needs to be swapped, the basic networking information of the HLR and MSC should be included. In addition, the description of the configuration and capacity of the network should also be provided based on the networking diagram. If possible, you can configure the BTS layout created by MAOINFO. If you have an all-round understanding of the above information, you can know more about the total network and see more clearly the order and difficulty of the swap project. Figure 1.1 shows the schematic drawing of a GSM network.
2016-07-05
HUAWEI Confidential
Page 13 of 112
GSM BSS Swap Guide
For internal use only
Figure 1.1 Schematic drawing of a GSM network In the urban area of XX city, the operator S has 2 MSCs. MSC1 can accommodate 270,000 users and has 5 BSCs. They are S BSC2, S BSC5, S BSC 6, S BSC 12, and Huawei BSC2, responsible for the covering eastern XX district, XX district, and XX road. MSC2 can accommodate 300,000 users and has 6 BSCs. They are S BSC4, S BSC7, SBSC8, S BSC11, S BSC20 and SBSC4, responsible for covering XX district and XX road. In the urban area of XXX city, there is 1 Huawei MSC. MSC4 can accommodate 270,000 users and has 6 BSCs. They are S BSC1, S BSC3, S BSC10, Huawei BSC1, Huawei BSC5, and Huawei BSC6, responsible for covering XX district and XX road.
II. Configuration Information of the Original Network The configuration information of the original network includes equipment configuration information, capacity information, provider information, BSC home information, BTS number under BSC, TRX number, etc. For details, see the following two tables. Table 1.1 MSC information in XXX city Equipment
Original
No.
Name
Capacity
Operator
Version
BSC Carried
1
MSC1
270,000
S
SR9
BSC2, 5, 6, 12, HWBSC12
2
MSC2
300,000
N
SR9
BSC4, 7, 8, 11, 20, HWBSC4
3
MSC4
270,000
Huawei
G6
BSC1, 3, 10, HWBSC1, 5, 6
4
MSC3
220,000
E
R12
BSC9, 13, 14, 18, 19, HWBSC3
Table 1.2 BSC information in XXX city No.
BSC Name
2016-07-05
Operator
BTS number
TRX number
HUAWEI Confidential
Coverage area
LAI
Page 14 of 112
GSM BSS Swap Guide
1 2 3
SBSC12 HWBSC2 HWBSC4
S Huawei Huawei
For internal use only
44 47 30
197 317 220
III. OMC Networking Diagram and Network Management System Information For the networks large in size and the network elements are distributed in vast areas, the OMC networking is often complex. In this case, multiple routers and switches are needed for communication. Sometimes the original semi-permanent connection equipment or timeslot insertion equipment can be used for the networking. Therefore, you are suggested to collect the OMC networking diagram of the original network. If the original OMC networking is simple and all the equipments are concentrated in a place, you can use simple local area network for TCP/IP communication. But before that, you should understand the composition of the local area network. In a word, it is a must for you to understand the original network management information and the accessibility of the third party’s equipments. Before swapping a network, you should have an overall understanding of the following contents:
The topology of the network
The accessibility of the third party’s equipments for alarming and traffic statistics
The formats and interface standards of the original traffic statistics and alarming data (Generally, TCP/IP is used for data connection and FTP is used for data transmission)
The types of the wide area network, including ISDN, DDN, X.25, frame relay, etc.
The components of the network, including HUB, exchange, router, ATM exchange, WAN exchange, access server, timeslot integration equipment, etc.
The performance of the network, especially the indicators about bandwidth and delay.
Figure 1.1 shows the OMC networking diagram used in XXX area.
Figure 1.1 The OMC networking diagram in XXX area 2016-07-05
HUAWEI Confidential
Page 15 of 112
GSM BSS Swap Guide
For internal use only
IV. Traffic Model of the Original Network The traffic model of the original network should be collected. Traffic model is the basic data for network capacity planning. Generally, the total network capacity is predicted according to mathematic models. First the traffic model is used to calculate the traffic volume of the system, and then the structure of the PLMN can be used to estimate the traffic volume present of interface, while the traffic volume of each interface can be used to decide the configuration of the voice circuits and signaling links at the interfaces. Finally, the TRX channel configuration of the base station can be decided. Traffic model will be greatly affected by social environment, economy, and main user groups and will change with the growth of user number. Customers’ RNP departments are responsible for providing the traffic model, so there is no unified standard. At present, the traffic model for voice service is mostly emphasized. Table 1.1 introduces the traffic model for the voice service of a domestic GSM network. Table 1.1 Traffic model for GSM voice service (a domestic GSM network) Item Busy-hour Erlang per subscriber Average call hold time Calling mobile subscribers Called mobile subscribers Calls made by each mobile subscriber at busy hour Call connected ratio Mobile subscriber location update at busy hour Secondary page ratio caused by called mobile subscriber Handovers for each call made by mobile subscriber Short messages send by each mobile subscriber at busy hour Short messages received by each mobile subscriber at busy hour Ratio of mobile subscribers roaming inside to total mobile subscribers Ratio of mobile subscribers roaming outside to total mobile subscribers Mobile subscriber activation ratio Mobile-Mobile Fix-Mobile Traffic distribution Mobile-Fix
Traffic model-1 0.018 48 39 57
Traffic model-2 0.018 48 39 57
1.35
1.35
80% 1.21
80% 2.61
20%
20%
1
1.7
128
100
384
211
10%
10%
10%
10%
100% 40% 36% 24%
100% 40% 36% 24%
Table 1.2 introduces the traffic model for the voice service of a foreign GSM network.
2016-07-05
HUAWEI Confidential
Page 16 of 112
GSM BSS Swap Guide
For internal use only
Table 1.2 Traffic model for GSM voice service (a foreign GSM network) Parameters Average Call Hold Time Erlang per Subscriber BHCA Mmobile to Mobile Mobile to Other PLMN Mobile to PSTN PSTN to Mobile SMS Numbers/BH/SUB(MO) SMS Numbers/BH/SUB(MT) Ratio of IN subscribers location update numbers/BH/SUB location update numbers/BH/SUB(to HLR) Authentication numbers/BH/SUB
Value 72s 0.02 0.5MO+0.5MT 60% – 20% – 1 1 95% 1.5 0.3 0.3
Remark – – – – – – – – – – – – –
Table 1.3 introduces the traffic model for packet data service. Table 1.3 Traffic model for packet data service Item GOS of circuit service Busy-hour Erlang per subscriber for circuit service GPRS user penetration rate IP layer bandwidth for each (BYTE/s) Bandwidth for each GPRS channel (BYTE/s) Busy-hour bandwidth for each GPRS subscriber (bps) GoS of GPRS service
Value 2% 0.03 50.00% 2500 2000 400 2%
Remark For reference For reference
Note: The increase of the SMS will raise the load on the NO.7 signaling link. Therefore, if the SMS takes a larger ratio, the configuration of the NO.7 signaling link should be adjusted accordingly; otherwise the SDCCH and NO.7 signaling link will be congested.
V. Customers’ Charging Setting Information Generally, you can collect the customers’ charging setting information from their market departments. There information to be collected includes the followings:
Time for free of charge Some operators set the time for free call. Generally, in this period of time, the traffic volume will grow rapidly and thus network congestion may be caused.
Monthly fee policies, including monthly fee for the calls made within the same network, monthly fee for called services, and monthly fee for packet data service.
Charging policies for SMS 2016-07-05
HUAWEI Confidential
Page 17 of 112
GSM BSS Swap Guide
For internal use only
2.1.2 Basic Needs and Functions of the Original Network You should analyze the basic needs and functions of the network according to the technical proposals made in contracts, especially you should check if the needs and functions that have been realized in the original network can be realized by Huawei BSS and if they are supported by Huawei software. If you find any problem, contact the technical supports as quickly as possible. Table 1.1 lists the basic services and functions of the original network.
Table 1.1 Basic services and functions of the original network Item Voice version Encryption setting Circuited data service TFO Cell broadcast
Content FR No Not support Support Support
EFR A50 2.4K
Remark – – – – Cell name,
HR AMR A51 A52 4.8K 9.6K Not support Not support
advertisement, LCS SDCCH dynamic allocation Mutual aid between main
Support Support Support
Not support Not support Not support
whether reports – – –
BCCHs MNC digit
Support
Not support
–
function Concentric cell CO-BCCH GS interface Extended cell GPRS/EDGE BSC/BTS intra-exchange Authentication Paging mechanism
Support Support Support Support Support Support – LAC paging
Not support Not support Not support Not support Not support Not support – LAC and
– – – – – – – Other paging
2G/3G handover Acoustic Echo Canceller
Support Support
paging Not support Not support
Noise Suppression
Support
Not support
extension
CI
–
2.1.3 Basic Equipment Information of the Original Network I. GSM Protocol Standard Phase Version For A-interface, the phase versions are PHASE2+, PHASE2, and PHASE1.
2016-07-05
HUAWEI Confidential
Page 18 of 112
GSM BSS Swap Guide
For internal use only
Note: To avoid that some functions cannot be realized normally after interconnection, you should check the protocol phase version supported by the original equipment if the original network has been there for a long time. You are suggested to use singling analyzer to collect the messages sent across the A-interface and Abis interface at busy hour and send them to technical supports for verification.
II. Software Version Information Table 1.1 lists the software version information of some network elements. Table 1.1 Software version information of MSC, BSC, and BTS No. 1 2 3 4
Equipment MSC1 MSC4 BSC2 BSC1
Operator S Huawei S N
Type – G6 – –
Software version SR9 R003 SR9 R10
Remark – – – –
5
BTS
N
ULTRASITE
DE21
–
III. BSC Configuration Information Table 1.1 lists the BSC configuration information Table 1.1 BSC configuration information BSC
Location
Operator
BTS
TRX
number
number
Half
rate
EDGE
TRX
TRX
number
number
Coverage
Slave
area
MSC
Urban area SBSC12
–
S
44
197
100
90
1 Urban area
MSC3
HWBSC2
–
Huawei
47
317
231
123
2 Suburban
MSC2
HWBSC4
–
Huawei
30
220
125
46
area
MSC3
IV. BTS Configuration Information Table 1.1 lists the BTS configuration information.
2016-07-05
HUAWEI Confidential
Page 19 of 112
GSM BSS Swap Guide
For internal use only
Table 1.1 BTS configuration information Cell BTS
Location
Operator
Type
configuratio n
TRX
Transmission
E1
Slave
number
mode
number
BSC
BFM K KPR
XX city
S
R11
S222
6
Micro wave
1
MSC3
I CBI
XX island
Huawei
3002C
O1
1
Satellite
1
MSC2
O
XXX
Huawei
312
S3443
14
Optical fibre
2
MSC3
V. TRX Configuration, Combiner Information, Set-top Power
Table 1.1 TRX configuration, combiner information, set-top power BTS Type A9100 BTS30
BTS312
Operator
Configurati
A Huawei
on S666 S222
Huawei
S666
Combiner Type
Combination
ANC+ANY CDU
Mode 4-to-1 2-to-1
2CDU+SCU
Concentric cell
Combiner loss
Set-top
8dB 4.5 dB
Power 7.1W 21.4W Underlay
Overlay:8dB;
:21.4W;
underlay:4.5dB
Overlay: 9.5W
Note: You are suggested to select the BTSs with typical configuration and perform field verification of the set-top power. In addition, you should check if the partner has installed the lightening protector.
VI. Tower Amplifier Information If the tower amplifier is configured for the original BTS, you should collect the tower amplifier information, as listed in Table 1.1.
2016-07-05
HUAWEI Confidential
Page 20 of 112
GSM BSS Swap Guide
For internal use only
Table 1.1 Tower amplifier information Specification
Operator
Type
Frequency
Receiver
Working
Working
band
gain
voltage
current
Power supply mode CDU
–
–
Triplex
900
12dB
12DC
100-200mA
feeder
–
–
Duplex
1800
–
–
–
–
–
–
Simplex
–
–
–
–
–
VII. Feeder Configuration Principle The feeders 7/8 and 5/4 are most commonly used. Some operators also use the feeder 18/8.
VIII. BTS Grounding Principle and Feeder Grounding Principle The BTS grounding principle and feeder grounding principle vary with operators. For example, the operators in Indonesia have no requirement on feeder grounding, but the operators in Iran do not allow the feeder to be connected with the tower directly.
IX. Indoor Coverage Distribution System Information Indoor coverage is used to improve the mobile communication quality for indoor users. The principle of the indoor coverage system is to use the indoor antenna distribution system to evenly distribute the signals from the BTS in an indoor environment. At present, the following solutions are used for indoor coverage.
Repeater + distribution antenna
Macro cell + distribution antenna
Micro cell + distribution antenna
Mini-micro cell + distribution antenna
Mini-micro cell only
You should pay attention to collect the indoor coverage solution used in the original network. If distribution antenna system is used, you should especially know the feeder configuration principle of the distribution antenna system and check if there is diversity reception.
X. Repeater Information The repeater is used in vast areas to cover the indoor dead zones and is the coverage extension of the surrounding BTSs. The types of repeaters include wireless frequency selection repeater, optical frequency selection repeater, wireless wide band repeater, and optical wide band repeater. You should have an overall understanding of the repeaters in the original network and pay special attention to the repeater location, transmit power, channel number setting, antenna configuration, etc. Table 1.1 lists the repeater information should be collected. 2016-07-05
HUAWEI Confidential
Page 21 of 112
GSM BSS Swap Guide
For internal use only
Table 1.1 Repeater information
Type Provider and
Band or
specification
Channel Selective
AFL GSM 900
Allgon AR 120
Band
Channel
GSM 900
Mikom MR 340
Channel
Gain
Power
/dB
Downli
nk )
Figure
/dB
Downli (Uplink
Noise
Downli
nk
nk
(Uplink
(Uplink
)
)
Order Intercep t
No.
/dBm
of
Size
Downli
Channe
/mm
nk
ls
(Uplink )
1,5,10,20
30,50,80,
4.5
40,47,50,
,25 W
95
(4.5)
54
550 x
(30,50,8
(40,47,5
220
0,95)
0,54)
24
40-60
<6
N/A
460 x
(10W) 2
230 (W)
(20)
285 (H)
dBm
120 (D)
32 dBm
85-89
(2channe
6-8
2
425 (W)
(2channe
channel
255 (H)
l)
l)
modules
110 (D)
28 dBm
82-86
(4channe
(4channe
l)
l)
per cabinet [2]
XI. Movable BTS Information Movable BTSs are often installed in the cars or in the containers that can be easily moved. The satellite or micro wave is used to transmit the signals for movable BTSs, so movable BTSs are often used in emergent communication situations. You should have an overall understanding of the configuration information of the movable BTSs in the original network and pay special attention to the TRX configuration, transmission mode, and antenna configuration.
2.1.4 RNP Data of the Original Network I. Proejct Parameters Hereunder lists the project parameter information
BTS information: BTS name, BTS number, BTS configuration, equipment specification
Cell information: cell number, longitude, latitude, CGI, BSIC, frequency band, channel number, frequency hopping, cell name
2016-07-05
HUAWEI Confidential
Page 22 of 112
GSM BSS Swap Guide
For internal use only
Antenna and feeder system: antenna type, antenna gain, polarization mode, half-power angle, electrical tilt, frequency scope, mechanical tilt, antenna height, azimuth, down tilt, feeder length, diversity mode.
Environment information: city, height above sea level, collocation site, coverage area (urban area or suburban area)
For more information, see RPO201-05 project parameter table (G).
II. Radio Parameters of the Original Network Providers and Special Functions The radio parameters of the original network providers include cell parameter, system parameter, handover, power control, access parameter, frequency hopping, adjacent cell, etc. First you should obtain the RNP parameter configuration files used by the original network providers from the customer, and then use the parameter conversion tool to convert these parameters into the ones used by Huawei. For more information, you can consult technical support engineers and related operation guides.
III. Original Network Traffic Statistical Data and KPI Formula The original traffic statistical files vary with equipment providers, but they can be converted into excel documents by corresponding conversion tools. Therefore, you can obtain such files from customer. For cell-level indicators, the busy-hour data in 7 days should be collected. For total network indicators, you can use the data reported on the customer maintenance day (one month of data is needed). Generally, the following KPIs will be contained in a contract:
TCH drop rate
SDCCH drop rate
TCH congestion rate
SDCCH congestion rate
Handover success rate
TCH assignment success rate
Call setup success rate
Call success rate
Paging success rate
Radio quality
These KPIs are obtained from some basic indicators through certain calculations and they reflect the statistical points used by the original equipment provider. You are suggested to collect the remark files of the KPI formulas from customers.
IV. Network Planning Principle For frequency planning principle, you should understand the frequency resource, frequency reuse pattern, reserved channel numbers, etc.
2016-07-05
HUAWEI Confidential
Page 23 of 112
GSM BSS Swap Guide
For internal use only
For cell naming principle, you should understand the composition of cell name, the matching relationship between cell sequence and azimuth. For CGI numbering principle, you should understand the matching relationship between the MCC, MNC, LAC and the areas, and the CI numbering scheme as well. For BSIC naming principle, you should know the optional scope of the BCC and NCC. For VIP area, such as the coverage hot-spots, capacity hot-spots, and key organizations, you should know the related agreements. For more information, obtain the related documents from the technical support engineers.
V. Channel Configuration You should know the principles used to configure the CCCH, SDCCH, and PDCH in the original network. In addition, you should also know the usage of half rate and AMR.
VI. MSC and RNP-related Information You should collect the following information:
MSC paging modes (paging according to LAC or CGI; TMSI paging, IMSI paging, or mixed paging; paging times, paging interval; or total network page)
Location update time at the network side
Voice support version
Encryption algorithm selection
Location update success rata and paging success rate
The settings of T305 and T308 have a great effect on call drop rate.
2.1.5 Core Network KPI of the Original Network I. MSC KPI of the Original Network The MSC KPI of the original network should be checked. Generally, you can check the following items:
Subscriber number ratio and intelligent subscriber ratio of the local VLR
Connective rate between MSCs
CPU seizure rate
Traffic volume per line
Traffic load per link
Paging success rate
Location update rate
Inter-MSC handover success rate
Short message sending success rate
Average duration
BHCA
2016-07-05
HUAWEI Confidential
Page 24 of 112
GSM BSS Swap Guide
For internal use only
II. PS KPI of the Original Network The PS KPI of the original network should be checked. Generally, you can check the following items:
ATTACH success rate
PDP activation rate
Packet paging success rate
Attached subscriber number
Average attach time
Average PDP activation time
III. Maximum Rate for User Subscription The maximum rate for user subscription is the most important user subscription parameters in HLR. If the peak throughput for the SIM subscription is incorrectly set, the EDGE rate will be slow. Hereunder gives an example. A user complained that the data service of the PCU MSC9 was unstable and the MSC9 rate ranged from 60 to 70 Kbps (the rate is far slower than the theoretical value) when 3 PDCHs were activated simultaneously. It is found later that the peak throughput was set to only 8000 octets/s (64Kbps) for SIM subscription. Therefore, the peak throughput the user can enjoy is 64Kbps during data transmission. After changing the peak throughput to 64000 Octets/s in the subscription information, engineers found that the average download rate was increased to 150Kb. Thus, this problem was solved.
2.1.6 Transmission Networking Information of the Original Network I. BTS Transmission Networking Information You should collect the following BTS transmission networking information:
The networking modes in common use, including star networking, tree networking, chain networking, ring networking, and mixed networking, in which the chain networking and ring networking should be paid special attention to.
If the operators are responsible for maintaining the transmission network by their own or they rent other operators’ transmission network.
If the original transmission network has adequate capacity and if another one transmission line can be added to the original site.
II. E1 Reuse Ratio of the Typically-configured BTS You should pay attention to the E1 configuration of the BTSs with big configuration and the maximum TRXs that one E1 can support. Generally, the modes include 10:1, 12:1, and 15:1.
III. E1 Types Twisted pair (120 Ω) and coaxial cable (75 Ω) are in common use. For the later one, its connector types include SMB and BNC. 2016-07-05
HUAWEI Confidential
Page 25 of 112
GSM BSS Swap Guide
For internal use only
IV. Microwave Transmission Equipment If microwave transmission equipments are wilily used in the original network, you should focus attention on checking the bit error and synchronization function of the equipment, the transmission alarm, and the alarm for clock out-of-synchronization.
V. Optical Fiber Information Check if the optical fiber is directly connected to the BTS. If yes, the type of the optical fiber and the type of the connector should be paid special attention to.
VI. Satellite Transmission Equipment The information about satellite transmission equipment needs to be collected is listed below:
Specifications and types of the satellite transmission equipment (VSAT or satellite MODEM)
Leased according to bandwidth or timeslot
Interfaces supported (Abis, Pb, Gb, A, Asub)
Stability requirement of transmission (BTS and satellite), average failure time and interruption time per year)
Circuit accuracy of satellite transmission (bit error rate)
VII. HDSL and SDSL Transmission Equipment With the help of twisted pair and digital modulation, HDSL and SDSL transmission technologies can be used to transmit 2M signals. The disadvantage is that the transmission may be easily interrupted, and thus the BTS cannot necessarily run normally. Considering the cost, some operators will use this transmission mode. When swapping a network, therefore, you should check the stability of the transmission equipment used in the original network.
VIII. Timeslot Consolidation Equipment The timeslot consolidation equipment can enhance the utilization rate of E1. That is, several BTSs can share 1 E1, or they can also use the E1 of the other network. For a swap project, you should especially check the allocation of the timeslots.
IX. Transmission Compression Equipment To save transmission cost, some operators will use transmission compression equipment to compress the data flow transmitted through E1. Therefore, to ensure that Huawei equipment can work normally after swap, you need to collect the compression theory, performance restriction, and compatibility of the compression equipment and send the information to the technical support engineers. Whether the equipment is compatible with Huawei BSS should be confirmed as early as possible.
X. BTS Concatention and Transmission Concatention The information about BTS concatenation and transmission concatenation should be collected, because the information is used to design concatenation data and decide the BTS swap order. 2016-07-05
HUAWEI Confidential
Page 26 of 112
GSM BSS Swap Guide
For internal use only
2.1.7 Power Supply Configuration of the Original Network Table 1.1 lists the information about the power supply configuration of the original network, and all the information should be collected. Table 1.1 Information about the power supply configuration of the original network Item Voltage of AC power supply Frequency of AC power supply AC phase Type of AC socket
Content –
Remark 110V, 220V, 110V (double live line)
–
50HZ, 60HZ
–
3-phase, single-phase English system, European system, American
–
system If the power supply always breaks, the battery discharge will frequently occur. In
Mains supply
–
this case, the life expectancy of the battery will be shortened and the BTS will be out of
Diesel configuration
–
Working hours of the diesel
–
Capacity
of
AC
power
distribution box Voltage of DC power Capacity of rectifier Capacity of battery Feeding duration of battery
Colour of power cable
Lightning
on
power supply Lightning requirement
on
transmission Grounding requirement Whether to use solar energy for power supply
UPS configuration
configuration. In the unit of KW.
– – –
+24V.-48V In the unit of KW In the unit of Ah In the unit of hour, depending on battery
–
–
requirement
unit of KW. In the unit of hour, depending on the fuel
–
–
Diameter of power cable
service. The power is twice that of the load, in the
capacity. Pay attention requirements,
especially
the
special
grounding
power cables of BSC and BTS equipment. Often 50KA
–
Often 5KA
–
customers’
cable. Pay attention to the diameters of the DC
–
–
to
Joint grounding; BTS < 5Ω; exchange room < 1Ω Pay attention to the solar radiation, the total power supply of battery array, and the capacity of the battery. Pay attention to the capacity of UPR (in the
–
unit of KVA). Types: one-in and one-out; three-in and oneout; three-in and three-out.
2016-07-05
HUAWEI Confidential
Page 27 of 112
GSM BSS Swap Guide
Inverter configuration Power supply mode
For internal use only
of
outdoor BTS
–
Pay attention to the rated power
–
Mains, diesel, and solar energy
2.1.8 Abnormal Network Information and Customer Complaints I. Network Failures and Alarming Information The following failures and alarms should be paid special attention to:
A-interface/Abs interface transmission alarm
BTS power supply alarm
No.7 signaling break alarm
II. Customer Complaints The complaints made by the customers in the latest month should be recorded and categorized; especially the problems concerning the coverage in hot areas and the problems that are mostly complained by customers should be checked. Generally, the following aspects deserve your attention:
The signals received by MS are weak and fluctuate greatly.
The subscriber is not in the service area.
The voice quality is poor. There are noise and one-way audio.
Call drop occurs easily.
The complaints about service failures, such as one-way audio, cross talking, call drop, incoming call failure, outgoing call failure, are made frequently.
There are complaints about PS service.
2.1.9 Customers’ Engineering and Maintenance Capability The following capabilities should be paid attention to, because they are references for the design of network integration solutions.
Capability to adjust the transmission ports
Capability to adjust the core network data
Capability to adjust BSS network data
Capability to maintain BSS network
Capability to implement projects and maintain organizational structure
2.1.10 Acceptance Information The acceptance should be performed according to contract. If there are vague descriptions or the committed indicators are abnormally high in the contract, you need to communicate with the customer for the confirmation of the acceptance mode and procedures in advance. The agreement
2016-07-05
HUAWEI Confidential
Page 28 of 112
GSM BSS Swap Guide
For internal use only
on acceptance time, place, personnel, standard, cases, documentation, and equipment should be reached with the customer.
2.2 Analysis and Evaluation of the Original Network 2.2.1 DT Evaluation I. Principle The DT deserves special attention, because the DT results can be used to understand the operation of the network and decide the DT line after the swap of the network. In addition, the DT results of the original network can work as comparative references for the swap. The roads covered by the major lobes of the cells should be chosen as DT lines and the DT lines should cover all the cells of the network. Note that the test should be performed at the busy hours during daytime.
II. Area DT The area DT aims to obtain the coverage signal level, conversation quality, handover, and call drop in the swap areas. In addition, the BTS distribution and coverage weakness of the original network should be obtained through area DT.
III. DT for Main Roads and VIP Areas The main roads and VIP areas should be specially tested, especially the handovers occurred on main roads should be tested, because the test results will be the references for coverage comparison and network optimization after swap.
IV. DT Data Analysis The DT data should be carefully analyzed. For example, you should verify the longitude and latitude of the BTS, the direction of antenna, and the cell parameters. In addition, you should also check if the antenna feeder is inversely connected and if there is cross coverage. Also the reasons for call drop and abnormal handover should be analyzed.
V. DT for Indoor Distribution System If the Bess to be swapped are connected to an indoor distribution system, you need to use the corresponding software that supports indoor test. Generally, you should get the permission for entrance before the indoor coverage test. It is better to obtain the plan view of the building beforehand. All parts of the building, including upper floors, middle floors, and lower floors, should be tested. Wrap test should be applied to corridor, meeting room, and offices during pace test. Note that the outer walls of offices and the areas near windows should be tested. The test items include signal level, conversation quality, cell reselection at the entrance and exit, and handover. For details, refer to the related guides about indoor coverage system acceptance. 2016-07-05
HUAWEI Confidential
Page 29 of 112
GSM BSS Swap Guide
For internal use only
A test analysis report is required after the completion of whole test. In addition, you can also obtain the related references from the technical support engineers.
2.2.2 Network KPI Evaluation I. Difference of KPI Formulas The KPI formulas used by Huawei are different from that used by the original network equipment provider in some aspects. At present, each equipment provider has the ability to design the traffic statistics and KPI formulas according to customer need, so the statistical points of other providers’ Kips may be different from that of Huawei Kips. Therefore, a full understanding of the original network (especially the KPI formulas and actual indicators) is quite necessary. Take the replies made by various equipment providers in an operator’s GSM statistical system for example; the calculation results of each provider are almost the same. For details, seek help from the technical support engineers. You are recommended to measure the paging success rate at MSC side and that measured at the BSS side should work as a reference only. Before selecting the corresponding Huawei statistical indicators, you should analyze the actual statistical scope of the Kips of the original network based on the evaluation of the definition of the statistical points used by the original network equipment provider. If no corresponding indicator is found, you need to communicate with the customer for other ones according to the interests of Huawei.
II. Evaluation Principle The traffic statistics exported by the original network should be used for evaluation. The evaluation aims to verify if the indicators provided by the customer are real. And the evaluation results are used as a comparative reference after swap. You can use the customer’s network maintenance report. If necessary, you can use related test analyzer for the evaluation.
III. Evaluation of Indicators about Voice, Signaling, and Capacity The traffic volume, SDCCH congestion rate, TCH congestion rate, paging times during busy hours, and call setup success rate should be evaluated for the understanding of the traffic distribution of the network. You should pay special attention to the signaling flow at the edges of location areas. And the pages made during busy hours also deserve your attention.
IV. Evaluation of Quality Indicators The quality indicators, including call drop, handover, immediate assignment, interference, RQ, etc, should be evaluated. You need to find out the Bess that have great effect against the total network indicators and the areas where the network quality is quite poor.
V. NSS-related Indicators The indicators related to NSS, including one-time paging success rate, location update success rate, A-interface signaling load, and inter-MSC module handover success rate should be analyzed, because these indicators may affect the radio network. 2016-07-05
HUAWEI Confidential
Page 30 of 112
GSM BSS Swap Guide
For internal use only
2.2.3 Other Evaluations I. CQT for VIP Areas CQT is the best method to check if the network quality is good or bad. It includes indoor COT and outdoor CQT. The spots for CQT are co-decided by the customer and Huawei RNO engineers. According to principle, it is better to choose important organizations, buildings, and prosperous areas as the test spots. Note that the spots chosen for the test should be consistent and the test instruments must be the same before and after the swap, otherwise the coverage quality cannot be effectively compared after the swap. Table 1.1 lists the main CQT items Table 1.1 Main CQT items Item name
Test value
Remark
Seized channel number Average signal strength LAC+CI Call times Call connected times Call drop times Voice break times Background noise One-way audio times Echo times Cross talking times
You can perform CQT by using MS for spot dialing test. Through analyzing the CQT results, you can see the network change.
II. GPRS Evaluation GPRS evaluation includes CQT evaluation, DT evaluation, and traffic statistics evaluation. GPRS CQT evaluation is used to reflect the network access ability, transmission delay, transmission rate, and service implementation. The test methods include attach test, WAP browse, Ping test, FTP test, WWW browse, etc. The test indicators include power, activation time, average delay, throughput, rate, etc. GPRS DT evaluation is similar to GPRS CQT evaluation. Besides the indicators tested according to GPRS CQT, the GPRS DT test indicators include location update, cell reselection, coverage, call drop, etc. The traffic statistical indicators include performance indicators and maintenance indicators. 2016-07-05
HUAWEI Confidential
Page 31 of 112
GSM BSS Swap Guide
For internal use only
For the related references, seek help from technical support engineers.
III. External Interference Test The external interference sources include TV station, big-power station, micro wave, radar, high voltage cable, analog BTS, CDMA network, meeting secrecy equipment, interference unit of gas station, etc. The interference from some sources is present at certain time. Generally, you can find out the interference through connecting the spectrum analyzer to the antenna. The Omni-directional antenna is beneficial for interference measurement. If you intend to locate the interference, you should use directional antenna. The commonly used directional antennas include plane antenna, 8-shaped antenna, and digital periodical antenna. The commonly used spectrum analyzers include HP85XX series and YBT250. The low-noise amplifier can be used to enhance the receiving sensibility of the test analyzer. For YBT250, the low-noise amplifier is installed in it. If the customer requires external inference test, you can refer to the related guides about interference problem handling.
IV. CW Test To obtain the radio propagation model fitting the local environment, enhance the accuracy of coverage prediction, and make a good preparation for network planning, some customers require the propagation model to be adjusted. CW test stands for continuous wave test and is an important step for propagation model adjustment. The brief steps of CW test are as follows: 1)
Select a suitable site to establish the test platform.
2)
Install signal source and antenna.
3)
Perform DT using the corresponding software.
4)
Process and analyze the DT data through corresponding software
For details, see the related guides about continuous wave test.
V. Simulation Some customers require coverage and quality simulation before and after the swap of the network and have certain requirements on DT data and simulation results. Generally, they require the schematic drawings of the coverage and C/I. Simulation software and 3-D digital maps are needed for simulation. And the adjusted propagation model is recommended. If the propagation has not been adjusted, you can use the ones provided by the customer. At present, Huawei uses ASSET and U-NET for simulation.
VI. MOS Test At present, the QoS of voice quality is evaluated subjectively, and the MOS (mean opinion score) is the most widely used. However, many objective measures have been used, and the basic ideas are similar. That is, different measurement technologies are used to simulate people’s auditory and
2016-07-05
HUAWEI Confidential
Page 32 of 112
GSM BSS Swap Guide
For internal use only
the equivalent MOS value is provided accordingly. Currently, the PESQ is a mature standard. Figure 1.1 shows the process.
Figure 1.1 Processing performed in PESQ As far as the PESQ is concerned, first the input signals and the signals that have been processed by the system are sent to the test instrument or related software for further processing, and the test instrument or the software will give the MOS classes. The value of PESQ ranges from -0.5 to 4.5. The greater the value is, the better the quality is. Generally, the value ranges from 1 to 4.5. For the matching relationship between the MOS score and voice quality, see Table 1.1. Table 1.1 Matching relationship between MOS score and voice quality MOS score
Voice quality
5
Excellent
4
Good
3
Fair
2
Poor
1
Bad
At present, many test instruments support MOS test. In many cities, the MOS test is a must now. Therefore, you should check the contract carefully to see if the MOS test is required and if the test instrument supports Huawei product.
2016-07-05
HUAWEI Confidential
Page 33 of 112
GSM BSS Swap Guide
For internal use only
2.2.4 Confirmation of the Acceptance Indicators after Network Swap I. Coverage Comparison If the customer requires coverage comparison test in the contract, you should pay attention to the following points:
Understanding the customer’s real intention.
Understanding the test environment and the coverage of the original network.
Designing the solutions to the interest of Huawei.
Protecting malicious interference.
For details, see the related operation guides about GSM BTS coverage.
II. Statement of Compliance You should check the RNP&RNO parts for which Huawei is responsible. If there is any vague point, communicate with the customer for clarification.
III. KPI Formulas and Other Test Methods You should communicate with the customer for the confirmation of each KPI and traffic statistical point. In addition, the test methods, such as DT, CQT, and the related test instruments must also be confirmed. Note that you should better guide the customer to use the methods and instruments recommended by Huawei.
IV. KPI Commitment Evaluation and Guidance You should evaluate the network after swap reasonably according to the information of the original network. If you find that the customer’s requirements on some indicators cannot be met, you should send the information to the project teams and the staff concerned as early as possible. In this case, all the departments or engineers concerned should take measures to make sure the pass of the acceptance test.
Chapter 3 Project Survey, Equipment Installation and Test This chapter describes the project survey and design, equipment installation and test. The engineering duration for this part is the longest and this part is quite important for the success of the network integration.
3.1 Survey and Design This section describes the survey of equipment room.
2016-07-05
HUAWEI Confidential
Page 34 of 112
GSM BSS Swap Guide
For internal use only
3.1.1 Survey of BSC/PCU Room You can survey the BSC/PCU room according to the related survey guide. The key points are listed in Table 1.1. Table 1.1 Key points for BSC/PCU room survey Item
Sub-item
Result
Remark The distance between the face of one cabinet and the face of the opposite cabinet must be equal to or
Installation position
larger than 1.5m. The distance between the sides of
cabinet
of the cabinet and the wall must be equal to or greater than 0.8m. The distance between the commissioning side and the wall must be equal to or greater than 1m. The load-bearing capability of the equipment room must be greater than 50kg/m2. The weight of the PCU is 183kg.
Conditions
Load-bearing
The weight of a BSC with full configuration is
capability
280kg.
of equipment
The weight of the front door and back door is
room
45kg.
Temperature and humidity
The weight of the two side doors is 42kg. The suitable temperature ranges from 15℃ to 30℃. The relative humidity ranges from 40% to 75%. The net height of the equipment room is the distance between the installation plane and the girder or the ventilation pipe. Generally, the net
Net height
height should be greater than 3m. When downward cable is used, the net height cannot be smaller than 2.7m. The equipment room should be 2m or more in
Size Power
Capacity of the
height and 1m or more in width. Generally, power suppliers with high-frequency
supply
rectifier
switch are required and they should be “N+1” backup. Each module of the power supplier must be installed with current equalization output device. The total power consumption of a single PCU must be smaller than 1200W. The maximum power consumption of a fullconfiguration BM is 350W. The maximum power consumption of a full-
2016-07-05
HUAWEI Confidential
Page 35 of 112
GSM BSS Swap Guide
For internal use only
configuration AM/CM is 500W.
DC
power
distribution box
You should check if the installation position is suitable and if the wiring terminal configured by Huawei is normally configured. Does the battery capacity meet the design
Battery capacity Colour of power cable
requirement? Does the customer have special requirement? Some customers require that the grounding cable should be red. At present, three specifications are available in
Diameter
of
power cable
Huawei. They are 240, 120, and 95 mm^2. You should check if the diameter of the power cable
Layout of power cable
meets the requirement. If the power cable delivered can be installed on the cable rack normally? And if the cable rack is fixedly stand?
Impedance
of
trunk Types
of
75Ω; 120Ω.
connectors used Transmission
for
the
(75Ω)
trunks at
the
DDF side Diameter
of
Generally, it is 0.4MM. If the customer has special
trunks (120Ω) at
requirement, the specification of 0.5MM can also
the DDF side
be used. The BSC supports external alarm, but the PCU
External alarm Lightning protection
Outdoor
cable
lightning
for
hardware installation; Clock extraction
Clock
modes
cable or power supply cable. If yes, check if the protection
measures
meet
the
requirement.
Responsibility matrix
does not support external alarm. You should check if there is outdoor transmission lightning
protection.
Others
BNC, SMB, L9
(BITS,
You need to confirm the responsibility matrix of the installation of transmission equipment and power supplier.
See related cases.
MCS, or others)
2016-07-05
HUAWEI Confidential
Page 36 of 112
GSM BSS Swap Guide
For internal use only
3.1.2 BTS Survey Table 1.1 lists the key points for BTS survey Table 1.1 Key points for BTS survey Item
Sub-item
Result
Remark If there is special procedures for entry; If there is restrictions for night entry;
Location of the equipment room
If special tools such as the ladder are needed for entry; If the transportation of the equipment is convenient; If installation conditions are needed for advanced installation. The load-bearing capability of the equipment room should be greater than 400kg/m2. Since battery free of maintenance should be installed in the equipment and if the specification of the battery is 500Ah or
Load-bearing
lower, the load-bearing capability of the equipment
capability
room must be greater than 450kg/m2. If the specification of the battery is 800Ah or higher, the load-bearing
capability must
be
greater
than
600kg/m2. Conditions of equipment room
Communication method used at the
equipment
room
You should check if the equipment room can receive the signals from other networks and if there is available fixed phone. You should check if the environment of the equipment room can support long-time operation of
Temperature and humidity
the equipment and if the air conditioner installed for the equipment room can work normally. Generally, if temperature in the equipment room can ranges from 15℃ to 30℃, and the relative humidity can ranges from 40% to 65%. The net height of the equipment room should be
Net height
equal to or greater than 2.7m.
Size of the door of the equipment room Installation
Power 2016-07-05
width. For the convenience of maintenance, you should
position Installation conditions
It should be 2m or more in height and 1m or more in
leave a distance between the BTS and the wall. The load-bearing capability, transmission condition, of
installation position of the mount set, and grounding
outdoor BTS AC power
system should meet requirement. Does the capacity of the AC power distribution box
HUAWEI Confidential
Page 37 of 112
GSM BSS Swap Guide
For internal use only
distribution box
meet the requirement of Huawei BTS? Generally, power suppliers with high-frequency switch are required and they should be “N+1” backup. Each module of the power supplier must be installed with current equalization output device. If the power supply voltage is -48V and +24V, the
Capacity of the
charge current of the battery should be additionally
rectifier
considered (according to 12 TRXs, 2800W). If the power supply voltage is 220V, you need to check if the DC power supply cable is installed at the proper position and the wiring terminal is normally installed (according to 12 TRXs, 3200W, including the charge
supply DC
power
distribution box
current of the battery). You should check if the installation position is suitable and if the wiring terminal configured by Huawei is normally configured. Does the battery capacity meet
Battery capacity Colour of power cable
the
design
requirement? Does the customer have special requirement? Some customers require that the grounding cable should be red. If the power supply equipment cannot be reused, you
Power supply of
should check if the power supply cable of the
transmission
transmission equipment of the original network is
equipment
long enough to be connected to Huawei equipment and if the diameter of the cable is suitable?
Transmission
Impedance
of
trunk Types
of
75Ω; 120Ω.
connectors used for
the
(75Ω)
trunks at
BNC, SMB, L9
the
DDF side Diameter
of
Generally, it is 0.4MM. If the customer has special
trunks (120Ω) at
requirement, the specification of 0.5MM can also be
the DDF side Timeslots
used.
allocated for E1 at
the
Abis
interface Transmission
Monitor the equipment timeslot occupancy, the timeslots of the related integration equipment, and timeslots used for G/C transmission. Check if the label or the mark is correct.
line and the label for 2016-07-05
DDF HUAWEI Confidential
Page 38 of 112
GSM BSS Swap Guide
For internal use only
transmission port Transmission concatenation
It will affect the swap order.
relationship Check if there is outdoor lightning protection cable
Outdoor
for the transmission line and power cable. If yes,
lightning
check if the lightning protection measures meet the
protection cable Lightning protection
requirement. Check if the grounding cable is present, if there is
Grounding
adequate room for the grounding bar, and if the
system
grounding terminal can be normally connected. Check the installation position, frequency band,
and grounding system
Antenna
feeder
lightning
affecting the swap progress, so the survey engineers should check them carefully in advance. Check if the grounding point can be connected to the
Feeder grounding rule feeder
related equipment, and the standing wave ratio. The problems concerning connectors are main factors
protector
Antenna
types of the connectors used for the antenna and
feeder grounding clip. The distance of the 900M antennas should be equal
Diversity distance between antennas
to or greater than 4m, and the distance between the 1800M antennas should be equal to or greater than 2m.
Project
Antenna azimuth and tilt angel.
parameters
Check if the connection of the feeder and antenna is correct. Use test MS to check if the cell configuration
Feeder layout
is correct and if the feeder label is correct and complete. Check the installation position, working band, power
Tower amplifier
supply mode, and alarming mode of the tower
Feeder
window
amplifier. If other antennas need to be added, you should check
thru-wall
if there is adequate room available in the feeder
and
window. If an antenna is shared by other equipment, you need
of
to check if the filter and combiner meet the
common antenna Feeder connector
requirement? If the antenna feeder of the network to be swapped
in the equipment
can be reused, you need to know the specifications
room
and quality of other equipment providers’ antenna
and plane Filter
combiner
feeders and check if they can match Huawei equipment.
2016-07-05
HUAWEI Confidential
Page 39 of 112
GSM BSS Swap Guide
BTS
For internal use only
type
combiner
and
You should confirm the TRX type of the BTSs to be
and
swapped and the types of the combiner and divider,
divider
because they are used to calculate the set-top power. BTS supports 24-channel extension alarm, and the
Outdoor
environment
extension alarm
alarm
box
supports
10-channel
extension alarm.
Engineering Others
responsibility matrix
Confirm the engineering responsibility of the of
hardware
installation of the transmission and power supply equipment.
installation
Note: If you find out that the environment of the equipment room or the installation of the antenna is not in accordance with Huawei rule, you should discuss with the customer and design adjustment measures, otherwise the operation of the network or the network indicators will be affected after the integration of the network. If the customer rejects the adjustment measures, you should ask the customer to sign a memo. In addition, if you find out that some connectors do not match Huawei equipment; you should design the corresponding solutions immediately.
3.1.3 M2000 Survey I. Equivalent Network Element You should calculate the number of the equivalent network elements according to the configuration of the equipment so as to ensure adequate management capability for M2000. Table 1.1 provides the calculation of the network element number. Table 1.1 Network element number calculation Network type
Number of network elements
Remark If the actual number of the cells is known, you should perform the calculation according to the actual
BSC+BTS
60 cells are equivalent to
number;
1 network element.
calculation
otherwise based
perform on
3
the cells
regardless of on BTS or NodeB or regardless
of
the
network
type
(W/C/G). iMSC tMSC 2016-07-05
1 1 HUAWEI Confidential
Page 40 of 112
GSM BSS Swap Guide
rMSC MSC PCU HLR GT800 BSC+BTS
For internal use only
1 1 1 0.1 60 cells are equivalent to 1 network element.
Table 1.2 provides the matching relationship of the network element number and the server configuration Table 1.2 Matching relationship of network element number and server configuration Management capability Server configuration
Equipment type
(equivalent
network
Remark
element) Mid-range-and-low-end configuration
High-end configuration
Super configuration
Sun Blade 2000
≤? ?
Sun Netra 20
≤15
Sun Netra 240
≤15
Sun Fire V880(4CPU)
≤30
Sun Fire V880(8CPU) Sun Fire V890(2CPU)
≤60 ≤25
Sun Fire V890(4CPU)
≤50
Sun Fire V890(8CPU) Sun Fire 4800(4CPU)
≤90 ≤40
Sun Fire 4800(8CPU)
≤? ?
Sun Fire E4900(4CPU)
≤55
Sun Fire E4900(8CPU)
≤120
II. About M2000 You should know the networking mode, bandwidth, and installation position of M2000 and if there is the network management system of the third party.
2016-07-05
HUAWEI Confidential
Page 41 of 112
GSM BSS Swap Guide
For internal use only
Networking mode: The communication between M2000 and each network element is based on TCP/IP. At the physical layer, partial E1/T1, whole E1/T1, or DDN/X.25 can be used. M2000 supports LAN and WAN. The networking planning depends on the geographic location of the network elements and customer needs. If all the network elements locate in the same network segment, LAN is often used; otherwise WAN is used.
3.1.4 Project Design Hereunder lists the tasks need to be completed during project design:
Checking the information of the original network equipment The information include the specification of antenna and feeder, performance indicator, connector specification, quantity of the transmission links used in the original network, mode and transmission line, connector specification of the DDF rack.
Surveying and checking the installation environment of the Huawei equipment and confirming the jumper length, trunk length, grounding system, feeder, and jumper connector information.
Confirming the environment of the equipment room of the original network and collecting the available resources.
Confirming the installation position of the Huawei BTS and attached equipment and confirming the configuration solutions used for transmission and power supply.
Completing the engineering drawing related to the equipment installation and integration.
Considering the anti-theft equipment or the anti-vibration equipment because some customers have special requirement in these aspects.
2016-07-05
HUAWEI Confidential
Page 42 of 112
GSM BSS Swap Guide
For internal use only
3.2 Hardware Installation This section describes hardware installation. For general cases, refer to the related manuals and pay attention to special cases. You should perform the installation following the design strictly and make self-check after the hardware installation. In addition, you should also make self-check after software commissioning.
3.2.1 Goods Preparation The on-time delivery of the correct goods is the key to the success of a swap project, so you should pay attention to the followings:
The way of delivery, the time and way of customs clearance.
If the goods are consistent with contract configuration.
The storage of the goods.
At the engineering field, you should pay attention to the followings:
For the convenience of engineering and collocation, it is better to store the goods in a vast land.
The storage of the goods must be in accordance with the customer’s rules.
You need to communicate with the customer on how to handle the goods in advance.
The package cannot be opened during the handling of the goods and the goods should be carried and placed lightly.
For the convenience of acceptance and cleanup, the goods should be placed according to certain principles.
The goods should be categorized according to service.
Pay attention to the storage of small components, such as cable, software, and screw, especially the small and light expensive goods.
On the arrival of the goods, pay attention to how to allocate the goods to the installation site. A record is needed before the allocation and the signature of the related project team is required.
If the goods are provided by agents, you need to communicate with the customer fully to ensure on-time delivery and security shipment.
3.2.2 BSC Installation I. Constructing a New BSC For hardware installation, you need to pay attention to the installation of the trunk, optical fiber, grounding cable, alarming cable, BAM, and loading cable. If there is CDB, you need to check the connection of CDB and MEM. After the completion of the installation, you need to check the followings:
If the self-loop checked has been performed for relay transmission? 2016-07-05
HUAWEI Confidential
Page 43 of 112
GSM BSS Swap Guide
For internal use only
If the labels are clear? If the optical fiber is bounded according to requirement?
If the there is no cross-connected lines and band connection?
If the self-check has been made according to hardware standard?
If the power-on test has been made?
For software installation, the correct version and license should be used.
II. Expanding the Capacity of an Existing BSC Through Adding BM For hardware, you need to check if there are cross-connected lines at the A-interface and Abis interface and if newly-added BM and AM are correctly connected, especially you need to check the connection of optical fiber. For software, you need to check if the upgrade and reapplication of License are necessary.
III. Expanding the Capacity of an Existing BSC Through Adding BIE Board Only For hardware, you need to pay attention to the operation rule, DDF connection, and transmission test. For software, you need to pay attention to the version and license.
IV. Expanding the Capacity of an Existing BSC Through Adding BTS Only There is no special requirement on hardware. For software, you need to pay attention to the version and license.
3.2.3 Huawei PCU Installation For PCU installation, you should pay attention to the connection of the power supply cable, trunks, and network cable. In addition, you should also check if the labels are correctly pasted and if the power-on test is performed according to requirement.
3.2.4 BTS Installation BTS installation and test contribute greatly to the success of a swap project. During BTS installation and test, the workload is heavy and a great number of abnormal conditions may occur. Hereunder describes the main scenarios about BTS installation and test.
I. Antennas and Feeders You should construct a new site following general procedures and this task should be finished in advance. In addition, the standing wave test should also be finished in advance. After that, you need to test if the antennas and feeders are well connected.
If the antennas and feeders of the original network can be reused, you should make sure that they can be connected to Huawei equipment normally and that the standing wave ratio will not change greatly after the swap.
2016-07-05
HUAWEI Confidential
Page 44 of 112
GSM BSS Swap Guide
For internal use only
If part of the original equipment can be reused while some new equipment should be added to the network, you should install the new equipment in advance and make sure that the original equipment and the new equipment can be normally connected.
If the antennas and feeders of other BTSs are used for this BTS, you need to check if the combiner, filter, and other related specifications meet the requirement.
II. BTS Installation Room Scenario 1: If there is adequate room left in the equipment room and the customer agrees that the new cabinet cannot be installed in another position, you can install the new cabinet in the due position and prepare the related power supply cable, trunks, antennas, feeders, and jumpers in advance. At the night for integration or pre-integration, you need to disable the original BTS and enable the new BTS. Note the original BTS should still be reserved at this time in case of integration failure. Scenario 2: If there is inadequate room for BTS installation and the new cabinet should be installed at the position where the original BTS located, you must replace the original BTS with the new one at the night for integration. In this case, you can place the new BTS to the equipment room first, and then prepare the related power supply cable, trunks, antennas, feeders, and jumpers in advance. If the installation of the new BTS cannot be finished on the integration night for the time being, you can integrate the new BTS into the network first, and then choose another suitable night to finish the whole installation. Scenario 3: If there is some room left in the equipment room for BTS in stallion, you can install the new cabinet in advance. If the capacity of the network needs to be expanded, you can install other parts after removing the rest original cabinet from the equipment room. In this case, you can place the new BTS to the equipment room first, and then prepare the related power supply cable, trunks, antennas, feeders, and jumpers in advance. If the installation of the new BTS cannot be finished on the integration night for the time being, you can integrate the new BTS into the network first, and then choose another suitable night to finish the whole installation. Scenario 4: If there is inadequate room left for the BTS installation, you can finish the whole installation later. If the new BTS is not so important, you can use the surrounding BTSs for the coverage temporarily. At the night for integration, you should ensure the network quality through adjusting the surrounding BTSs in advance, and then break the services provided by the original BTS.
III. BTS Transmission If the transmission resources are adequate, you can finish the whole integration in advance. In this case, the tasks involved are simple and you can debug the BTS. If the power-on test is not available, you can perform self-loop test so as to ensure smooth transmission.
2016-07-05
HUAWEI Confidential
Page 45 of 112
GSM BSS Swap Guide
For internal use only
If the transmission resources are inadequate, you should debug the transmission when integrating the network. If a great number of BTSs need to be integrated, the transmission resources are the key to the success of the swap. In this case, you need to perform off-line test to check if the BTSs work normally.
IV. BTS Power Supplier If the capacity of the power supplier needs to be expanded, you need to communicate with the customer to solve this problem before integration. If the customer cannot provide enough capacity, you can enable only part of the TRXs. If there is no room left for the installation of the power supplier, you can also communicate with the customer for solution. If there is enough room for the installation of the power supplier, you can install it in advance.
3.2.5 M2000 Installation It is simple to install the M2000. If the number of network elements is great, you need to replace the M2000 server and change the IP address accordingly.
3.2.6 Removing the Equipment of the Original Network Huawei engineers are responsible for removing the equipment of the original network according to the contract. Generally, you should remove the equipment of the original network after Huawei equipment works normally in the new network. Here you should pay attention to the following two points:
You can use packaging material of Huawei equipment to package the removed material.
The removed equipment should be soundly transported to the destination on time.
3.3 GBSS Test GBSS test must be made before network integration. And this section introduces the GBSS test points.
3.3.1 BSC Test Points Hereunder lists the BSC test points:
There are many BSC signaling points, so new signaling points should be used for swap.
If the MSC to be swapped is provided by other operator, you need to perform IOT compatibility test with the help of Huawei technical support engineers.
Since it is the BSC that need to be tested, you are suggested to perform the test according to the related acceptance manuals provided by Huawei. The customer’s special requirement cannot go beyond the contract.
2016-07-05
HUAWEI Confidential
Page 46 of 112
GSM BSS Swap Guide
For internal use only
If there is cross-BSC handover or cross-MSC handover after Huawei BSC has been
integrated into the network, you need to make handover test. BSC has great effect against clock, so you need to evaluate the clock in advance. If the
transmission is not good or the MSC clock is not stable, you need to make clock test. If there is no signaling transmitted at the Abis interface, you should install a temporary BTS
or micro-cell BTS at the suitable place for signaling test. For G9, A-interface is related to UMG8900 and MSC Server. The UMG8900 is responsible for the access and exchange of data service and the processing of traffic flow format. In addition, signaling gateway can be embedded into the UMG8900, so calling messages can be sent to UMG8900 for adaptation before sent to MSC Server for processing.
3.3.2 CDB/CBC Test I. Testing Connection between CDB and GMEM
Debugging the connection between GMEM board and host
Testing the connection between GMEM board and CDB server
Testing CDB server
II. Testing Connection between CDB and CBC
Testing the connection between CDB and CBC
Inputting test messages at the maintenance and test console
Monitoring the messages sent across the Abis interface at the BSC maintenance console
III. Testing Short Message Display (MS) When the BTS works normally, you should use the test MS or the MS supporting cell broadcast to perform the acceptance test. At this time, if you enable the cell broadcast reception functions and set received channel number to the ID of the test message, you can see the test message through MS. If the MS cannot receive the cell broadcast message, you should first check if the cell broadcast reception switched is enabled and if the corresponding channel number is set, and then you should check if the connection between CDB and GMEM is normal. Finally, monitor the messages and locate the problem at the BTS maintenance console. By now you have finished debugging the whole CDB cell broadcast database.
IV. Precautions about CDB&CBC Test Hereunder lists the precautions about CDB&CBC test:
You should use the interface monitoring function provided by the OMC to monitor the Abis signaling and check if the CB messages from BSC to BTS are normal.
If the CDB and CBC cannot be interconnected, you need to check the phase mark carried in the cdbcfg.ini of the CDB configuration file.
2016-07-05
HUAWEI Confidential
Page 47 of 112
GSM BSS Swap Guide
For internal use only
When performing message display test, you need to pay attention to the language used in that area, because some special characters cannot be displayed through MS.
Since the CDB interface and CBC interface are not standard interfaces according to protocols, you must test the interconnection between CDB and CBC.
3.3.3 PCU Test Hereunder lists the precautions about PCU test:
Network configuration test To perform network configuration test, you need to log in to the system through Telenet.
Hardware data configuration check You should input the command “slot show all”. If the configuration is normal, the system will display that the “status” of each slot is “normal”.
E1 configuration check Input the command “pcu check e1config” to check the E1 configuration.
PCIC status check You should input the command “mt pcic show available all”. If the results show that the number of available PCIC is consistent with that of E1 slot, the E1 slot is successfully configured.
LAPD link status check You should input the command “mt lapd show state {
all} | | ”. If the management status is “unlocked” and the operation status is “available”, the status of the LAPD link is normal.
Cell configuration check (Gb interface) You should input the command “pcu check cellconfig all” and the result is that the configuration is intact.
PDCH status check Input the command “mt pdch show state {|} {|all}” to check if the status of PDCH is normal.
MS attach test Once the MS is powered up, it will search the GPRS network automatically and initiate the attach procedure, so you should test if the MS has been attached to the network successfully.
PDP activation test PDP can be activated through the MS directly. Also you can activate the PDP through connecting the MS to portable equipment.
POMU changeover test The POMU changeover functions are related to multiple equipments, including LanSwitch, HSC board, network cable, etc. Therefore, you need to test the changeover function of POMU to check if the connection between the equipments is normal.
2016-07-05
HUAWEI Confidential
Page 48 of 112
GSM BSS Swap Guide
For internal use only
3.3.4 BTS Test I. Off-line Test If the transmission is not available, you can use local maintenance console to perform off-line test for the BTS. Hereunder lists the test items: TMU and TRX board check
TMU and TRX must be self checked after powered on. If the TMU self check fails, the ALM indicator will flash. Software version check (TMU and TRX)
You should check if the software versions of the TMU and TRX are consistent with the applied ones. If the software versions are inconsistent, you need to upgrade the software to the corresponding version. Local software loading and activation
You need to check if the software is normally loaded and activated. EAC status check
You should check if the communication between EAC and BTS is normal. Environment alarming check
You should check if the environment alarm probe works normally and if the alarming information can be reported to the BTS. TRX power test
You should test the TRX power at each output port (the TRX board should be preheated for at least 30 minutes). If there test value is abnormal, you need to replace the TRX board with another one. (Generally, the normal test value ranges from 46.98 dBm to 49.08 dBm.
II. On-line Test and Coverage Evaluation To ensure the reliability of Huawei equipment before the implementation of the swap, you need to perform on-line test for Huawei BTSs. In addition, you also need to test and evaluate the set-top power of various typically-configured Huawei BTSs, because the information is necessary for customer communication. Generally, you can make the test and evaluation according to following steps: 1)
Test and evaluate the set-top power of the typically-configured BTSs and record the results. After that, disconnect the antennas and feeders of the original BTSs and test the indicators (such as the standing wave ratio) of the antenna feeder system to see if the they meet the requirement of Huawei BTS. If yes, the antennas and feeders of the original network can be integrated into the Huawei BTS; otherwise you should make corresponding measures according based on the customer’s permission.
2)
Integrate the trunks of the original network into the Huawei BTS temporarily.
2016-07-05
HUAWEI Confidential
Page 49 of 112
GSM BSS Swap Guide
3)
For internal use only
After the BTS finishes loading the data automatically, you should use frequency locking function of the MS to make dialing test. Note that each channel number and timeslot should be tested. In addition, you should also perform DT to test the coverage and handover.
4)
After the test, you should recover the equipment to the original state, and then evaluate the coverage of the original network. This operation can be made before the on-line test.
5)
Compare the set-top power and the coverage of the new network with that of the original network and take anti-risk measures according to actual conditions.
Note: You should report the coverage results to the customer in time to make the customer feels confident in Huawei equipment. In this case, Huawei is more likely to win the customer’s support.
3.3.5 M2000 Test If WAN is used for M2000 networking, the LANs can be connected to each other in various ways, including partial E1/T1 networking, whole E1/T1 networking, and DDN/X.25 networking. Hereunder introduces the debugging procedures of partial E1/T1 networking.
I. Partial E1/T1 Networking When partial E1/T1 networking mode is used, the Mercury3600, routers, Ethernet switch, and other network elements should be configured in the network, as shown in Figure 1.1. If necessary, you can add set a firewall between the M2000 Server and the network element or the client end.
Figure 1.1 Partial E1/T1 networking mode
II. Network Debugging (Partial E1/T1 networking mode) The following table lists the steps. 2016-07-05
HUAWEI Confidential
Page 50 of 112
GSM BSS Swap Guide
For internal use only
Step
Operation
Reference
Connect the M2000 Server, client end, and each 1
network element to the Ethernet switch through network cable.
2
Configure the Ethernet switch.
3
Configure routers for network elements.
4
Configure routers for M2000 Server.
5
Configure Mercury3600.
6
Configure firewall if necessary.
3.3.6 Equipment Function Acceptance The acceptance should be performed according to contract. If the acceptance items provided in the contract are vague, on-site engineers should communicate with the customer on project installation, test mode, acceptance mode, and acceptance procedure. In addition, on-site engineers should also reach agreement with the customer on acceptance time, place, personnel, standard, cases, documents, and equipment. Especially for BTS acceptance, you should make clear if the acceptance should be performed one by one or by batch and if the acceptance should be performed before or after the integration of the network. Furthermore, you need to know the customer’s special requirement on project engineering. If the customer requires the equipment provider to design the test and acceptance solutions, you should communicate with the customer before the final solutions are made and get the customer’s written confirmation. In principle, the network cannot be put into operation before acceptance.
Chapter 4 Network Swap Planning and Network Parameters 4.1 Network Swap Planning 4.1.1 Whole Network Planning I. Coverage Planning It is important to ensure that the coverage capability of the new network is equal to or better than that of the original network. This is the general swap principle. For details, see the related coverage planning guides. Hereunder lists the precautions about the swap planning:
To prevent the network coverage from being heavily affected by the swap, you need to check the antennas and feeders of the original network if they can be reused. If there is any
2016-07-05
HUAWEI Confidential
Page 51 of 112
GSM BSS Swap Guide
For internal use only
problem, you should sign a memo with the customer and provide corresponding adjustment measures.
If new antenna and feeder will be used to replace the old ones, the azimuth and tilt angle of the new antenna and feeder should be consistent with that of the old one. If the customer requires you to adjust the azimuth and tilt angle of the antenna to meet special coverage requirement, you should sign a memo with the customer. In this case, you should integrate the change of antenna gain and feeder loss into consideration.
To obtain the set-top power used for the swap, you need to analyze the TRX power, combination mode and loss of the sites of the original network. In addition, you should also decide the configuration solution according to the TRX power and combiner type of Huawei. If the set-top power of the original equipment is greater than that of the Huawei equipment, you should guide the customer to accept the solutions provided by Huawei. Generally, you can use the 60W/TRX or PBU. Note that you should output a configuration table for each site.
Hereunder lists several principles for site configuration:
Try best to use the common configuration solution of Huawei or the 60W/TRX to meet the coverage requirement after swap.
If the set-top power of the new network is lower than that of the original network under common configuration, you can use PBU if no cabinet should be added.
If PBU cannot be added to all the TRXs, you are suggested to use both the PBU and IUO strategy.
If PBU cannot be added to the original cabinet, you can add PBU and use multi-antenna configuration.
If the set-top power of some TRXs is still lower than that of the original network when multi-antenna configuration is used, you are suggested to apply PBU configuration to all the TRXs.
If multi-antenna configuration is not supported, you can apply PBU configuration to the newly-added cabinet.
If both PBU configuration and multi-antenna configuration are not supported, you are suggested to add new sites to the network and enable cell splitting strategy.
However, you need to pay attention to the following three points:
If some sites need to be expanded or their combination modes have changed after swap, you should swap the sites according to the original configuration and then expand the capacity.
For the swap of the sites with large configuration, you can seek help from the technical support engineers of Huawei and they will provide you with the corresponding operation guide.
If the tower amplifier was used for the original site, it should also be used for the new site, but you should check the power supply mode and working current.
2016-07-05
HUAWEI Confidential
Page 52 of 112
GSM BSS Swap Guide
For internal use only
After the completion of coverage planning, you should input the planning information into the total project parameter table.
II. Capacity Planning You should swap the network according to its original configuration and the capacity expansion should be performed after the swap. For details, you can refer to the related guides about capacity planning. For signaling channels, you should plan the configuration solution through analyzing the configuration of the signaling channels (CCCH and SDCCH) used in the original network and analyzing the characteristics of Huawei equipment. At the intersections between location areas, you can add SDCCH and enable the SDCCH dynamic allocation function of Huawei equipment. For details, you can refer to the related guides about SDCCH capacity planning. You should also follow the configuration of the original network to swap the PDCH. If the customer requires Huawei to provide GPRS/EDGE services after the swap, you can plan the capacity according to the related guides about GPRS/EDGE network planning. Note that PBCCH and PCCCH should not be configured in the original network.
III. Frequency Planning To ensure the smooth network transition, you are suggested to follow the original frequency planning for the swap; otherwise the conversation quality may become worse after the swap. If you find that there is serious problem or the frequency planning of the original network will affect network quality, you can re-plan the frequencies for the total network or for some areas. Note that the frequencies at the intersections between networks should be properly designed. For details, see the related guides about frequency planning.
IV. LAC and CI Planning You should negotiate with the operator concerned to decide the LAC and CI planning. During the swap, you are suggested to provide new blocks for LAC and CI. The LAC edge of the original network can be used for the new LAC, but the CI must be re-planned. In this case, you can design the MSC data and BSC data in advance to ensure the security of the data. If problems are present at the LAC edge, you can adjust LAC edge from the perspective of total network after the network has been swapped. If the LAC and CI of the original network are stilled used after the swap, you need to change lot of MSC data and BSC data on the swap night. For BSIC planning, the BSICs of the same-frequency BCCHs must be different. When swapping a project, you are suggested to shift the NCC and follow the BCC of the original network. In this case, you can configure the adjacent cell relationship in advance; otherwise you must modify the data on the swap night. For details, see the related guides about location area capacity planning. When changing LAC, you should take the charging equipment and MSC routing into consideration. 2016-07-05
HUAWEI Confidential
Page 53 of 112
GSM BSS Swap Guide
For internal use only
V. Radio Parameter Planning To ensure smooth network transition, you should take the radio parameters of the original network into consideration. After the completion of the swap, you should optimize these parameters. Some equipment parameters can be the defaulted ones according to Huawei. If only some of the parameters can be collected, you should refer to the related parameter planning guides. When planning radio parameters, you should pay attention to the periodical location update time, uplink and downlink DTX, radio link expiry, SACCH multi-frame number, ECSC, multi-band report, minimum access level of RACH, minimum Rxlev of MS, direct retry, CRO, CRH, etc.
VI. Huawei Functional Parameter Planning Huawei has developed many excellent functional algorithms for its GBSS system, including handover algorithm and parameter, channel allocation algorithm and parameter, IUO parameter, etc. To ensure that the network can work normally after swap, you should use the proper handover algorithms (PBGT handover, emergent handover, edge handover, load handover, or IUO handover) and plan the related parameters properly. Generally, the PBGT handover algorithm, load handover algorithm, and IUO handover algorithm, and emergency handover algorithm (including TA emergency handover algorithm, BQ emergency handover algorithm, and interference emergency handover algorithm) are needed in a network. In some urban areas where the traffic volume is heavy, load handover algorithm should be used. For power control, the HW II power control algorithm is used. For channel allocation algorithm, HW II Channel Allocation algorithm is used.
VII. Special Scenarios You should pay attention to the coverage planning in some special scenarios, such as indoor environment, tunnels, railways, subways, etc. For example, you can use indoor distribution antenna system to provide the coverage for indoor environment and use big-power TRX and highgain antenna to provide the coverage for vast area. Pay attention to use repeaters. If the repeaters to be used are frequency selection repeaters and if the channel number of the donor antenna needs to be changed after the swap, you should notify the customer to change the repeater data. For details, you can refer to related planning guides or seek help from technical support engineers.
4.1.2 Network Swap Planning Data Design Before designing the data, you should use the parameter conversion tool made by Huawei to convert the parameters of original operator into Huawei parameters.
I. Designing Network Swap Planning Data The following table lists the data design methods, precautions, advantages, disadvantages, and suggestions. Data
Design
Types Frequency
Methods Take the data used in
Remarks and precautions
Advantages
1. Design the frequency
1.
The
problems
planning data for each
concerning
the
2016-07-05
Disadvantages
HUAWEI Confidential
Suggestions
1. If the frequencies
1. You can
in
inherit
the
original
the
Page 54 of 112
GSM BSS Swap Guide
For internal use only
the original
Huawei site according to
frequencies at edges do
network are poorly
frequency
network for
the
not exist.
planned, the network
planning data
reference
original network.
2. The understanding of
will not be apparently
used in the
2. If frequency hopping is
project parameters will
improved and the old
original
used, pay attention to the
be more complete and
problems
network.
allocation
thorough.
present.
hopping mode, MA, HSN,
3. The frequency will be
2.
and MAIO.
more rational.
expansion,
data
used
of
in
the
frequency
are
2. Network TRX
construction, BTS
Re-plan the
Prepare
new
frequency
data
planning before swap.
1.
still
and
construction
swap. 1. The
irrational,
quality may become
frequency planning in
worse because of the
the original network can
change
be corrected.
frequency
expansion,
TRX
network
of
the
planning
data
construction
prevent
frequency
plan
the
frequencies for the total network.
performed during the
interference occurring at edges. 1. You need to re-
Inherit
LAC but re-
When using the LAC of
swap. 1. The
CI
the original network, you
small at the swap night.
apply
Inherit the
need to consider if the
2. The location areas are
number
original
capacity of the location
clear and there is no
otherwise you cannot
area is large enough.
mixed LAC.
prepare the MSC data
but
you can re-
to
LAC and
LAC
are
2. You need to make transition
be
the
methods.
construction, and BTS can
in network
the
network
methods used
at the same time with
concerning
The
planning
original
problems
the
frequency
cannot be performed
The
2.
If
workload
is
for
the
CI
segment;
re-plan the
in advance.
CI
2. You may need to
the
plan the CI.
re-plan the LAC after swap. If only some of the BTSs under the BSC can be swapped at
Inherit both
that night, you need
of the LAC
to change plenty of
and CI
adjacent
cell
information, so the BSIC
The planning workload
swap risk is high. The same frequency
Shift
the
is light.
may have the same
NCC
and
BSCI and you cannot
keep
the
network for
design the adjacent
BCC
reference
cell in advance.
unchanged.
Take
the
Inherit
the
BSIC
data used in
configuration data used in
the original
the original network.
2016-07-05
HUAWEI Confidential
Page 55 of 112
GSM BSS Swap Guide
For internal use only
1. When re-planning the
1. When the frequencies
BSIC data, shift the NCC
of the original network
only. For example, if the
are reused, you can also
NCCs
design the data for two
of
the
original
network are 0, 1, and 2,
sets of adjacent cells.
they can be 3, 4, and 5
2. The swap data can be
after the shift. For BCC,
loaded to the BSC in
Re-plan the
you
advance and the data for
data
unchanged.
two sets of adjacent
2. Check if the adjacent
cells can be operated
cells are using the same
simultaneously.
should
keep
it
frequency and same BSIC. 3. Pay attention to modify the BSIC of the external adjacent cells at the edges Cell
during batch swap. 1. Use parameter
The network quality can
It is hard to collect all
Design
optimizati
conversion
to
be ensured after swap,
the data because the
data
on
convert the parameters of
because most of the
data
according to
parameter
the original network into
parameters used in the
with operators.
corresponding
original
Take
the
data used in the original network for reference
tools
Huawei
ones, and then analyze if these
parameters
network
format
varies
the
the
are
parameters
inherited.
used in the
are
original
applicable according to the
network and
characteristics of Huawei
use
equipment.
related
2. If some parameters of
parameter
the
collection
original
network
cannot be obtained, you
the
tools.
can use Huawei empirical parameters
first
and
optimize them later. 1. Take the related
The planning method is
1.
network
simple
parameters are no fit
planning
data
guides for example. Use
2.
Configure
Huawei
according
empirical
empirical value.
the
to
and
the
workload is light. data
The
radio
for the actual radio environment, so the
Huawei
network
indicators
may fluctuate greatly
value
after swap. 2. The optimization workload is heavy 1. You can make the
1. You can inherit the
after swap. Some data of the
Modify
data used in
adjacent
data
data of the adjacent
original adjacent cells
data based on
the original
according to the data used
cells that are used for
may be missing or
that used in
Adjacent
Take
cell parameter
the
2016-07-05
cell
HUAWEI Confidential
the
Page 56 of 112
GSM BSS Swap Guide
For internal use only
in the original network,
actual
handover
and then use NASTAR or
reduce
the
MAPINFO
workload.
for
to
irrational, you need
planning
to check the data for confirmation.
optimization.
2. The handover will
2. For one-time swap, you
not be greatly affected
need to make the data for
after
one set of adjacent cells
integration, so it is good
only. For batch swap, you
for
need to make the data for
optimization.
network network
two sets of adjacent cells at the edges. In addition, you
should
notify the
customer to modify the adjacent cell data designed by the original operator. 3. If Huawei sites are under
the
control
of
multiple BSCs, you should network for
make the adjacent cell
the
original
reference
data accordingly.
network.
4. Pay attention to design the data for the adjacent cells outside the BSC edge.
The
number
of
adjacent cells cannot be greater than 32. For batch swap, if you need to make the data for more than 32 adjacent cells, you are suggested to reserve the original cells first, and then delete the old data before add new data. 5. After the completion of the whole swap, you need to cancel the information of the redundant adjacent cells.
The calculation of LAC is based on certain traffic model and paging strategy. Since the traffic models in cities and countries are different, the capacity of a location area may greatly different from that of another location area. For details, you can refer to corresponding guides and seek help from technical support engineers. The following table gives the capacity of a location area. (If the traffic volume of each subscriber is 0.02Erl at busy hours.) 2016-07-05
HUAWEI Confidential
Page 57 of 112
GSM BSS Swap Guide
For internal use only In average, 3 TRXs configured
Frame No.
BCCH
Paging
allocation
mode
AGCH reserved blocks
PCH blocks
number between same
Subscribers supported
Traffic volume supported
pages
IMSI Main BCCH TMSI
IMSI Combined BCCH TMSI
are
In
for
average,
2
TRXs
are
each
cell.
configured
for
(Suppose
that
each
cell.
the call loss rate
(Suppose that the
is
and
call loss rate is
each
0.5%
cell
0.5% and each cell
supports
11.8
supports 6.6 Erl.)
2
7
2
83785
1676
Erl traffic.) 424
1
8
2
95754
1915
484
575
0
9
2
107724
2154
545
647
2
7
2
130701
2614
661
785
1
8
2
149372
2987
756
897
0
9
2
168044
3361
850
1009
1
2
2
30238
423
107
127
0
3
2
45357
635
161
191
1
2
2
48494
679
172
204
0
3
2
72740
1018
258
306
503
Remark
Immediate assignm preferred
Immediate assignm preferred
Immediate assignm preferred
Immediate assignm preferred
Note that in actual calculation, if the traffic models are used in another occasions, you need to change the traffic volume accordingly. In this case, the calculation res will be different.
After completing planning the data, you need to design RNP parameter design report and project parameter table.
II. Designing Other Data For how to design handover algorithm and related parameters, power control algorithm and related parameters, and channel allocation algorithm and related parameters, refer to the corresponding guide and seek help from technical support engineers. In addition, you need to design the related data specified in the RNP parameter design report.
III. Designing Data for Secondary Integration If a BTS should be integrated into one BSC before being integrated to the destination BSC, you should design two sets of data for the BTS. The frequency parameters can keep unchanged. You need to check if adjacent data and LAC needs to be modified.
4.1.3 RNP Data Review When reviewing the RNP data, you should pay attention to the following points:
If the corresponding documents are output, including project parameter table, swap planning report, acceptance indicator confirmation and guide record, and RNP parameter design report. 2016-07-05
HUAWEI Confidential
Page 58 of 112
GSM BSS Swap Guide
For internal use only
If the output documents and RNP data are correct, applicable, and complete.
If the network quality meet the customer’s requirement.
4.2 Network Interconnection Parameter Confirmation 4.2.1 A-interface Interconnection Parameters The following table lists the A-interface interconnection parameters. Type
Item
Remark Hex or decimal notation. The
Signalling point code
signalling point code of BSC must be consistent with that of MSC. Domestic equipment is defaulted. The signalling network mark of
Signalling network mark
BSC must be consistent with that of MSC. It is defaulted to 14 digits. The coding scheme of BSC must be
Coding scheme
consistent G9MSC
Relay signalling
and CIC range and CIC of each E1
2016-07-05
interface 24-digit coding. Each timeslot of each relay circuit of
MSC
and
BSC
must
be
CCS7 links and 2 LPN7 boards for
and
SCCP-TIAS length
Matching impedance of E1
CRC verification
A-
consistent with that of BSC. You are suggested to configure 2
Selection BSC clock source
connection
support
with that of MSC. The signalling link of MSC must be
Signalling link number
Physical
MSC.
link slot of BSC must be consistent
Signalling link code
Timers
not
of
in MSC. Generally, it is 16. The signalling
Signalling link slot
length
does
that
consistent. This slot must be set to unavailable
TCSM maintenance slot
SCCP-TIAR
with
each module. Generally, they
are
defaulted
values. Sometimes the BSC data needs to be modified. Select two good E1 lines and extract clock from them. The matching impedance of E1 must be consistent with that of the transmission equipment. The CRC of MSC must
be
consistent with that of BSC.
HUAWEI Confidential
Page 59 of 112
GSM BSS Swap Guide
For internal use only
(HR, FR, EFR, AMR) The circuit Voice version supported
number must be corresponding to
Half-rate channel allocation
the voice version. It is default to the BSC allocation
strategy Mobile
country
mode,
strategy.
country
code,
mobile
network number A-interface phase mark CGI
MSCs. For new sites, it is PHASE2+, and sometimes it is PHASE1. The CGI of BSC must be consistent with that of MSC. Paging according
Service function
They must be consistent among
MSC paging mechanism
to
LAC
is
recommended; otherwise the Ainterface
signalling
load
will
increase. (A50, A51, A52). No encryption. Encryption algorithm
The encryption algorithm of BSC must be consistent with that of MSC. The location update period of MSC
T3212
(VLR) must be longer than that of BSC (VLR). Inter-BSC handover and inter-MSC
Handover relationship
handover
should
be
properly
configured.
4.2.2 Gb-interface Interconnection Parameters Type E1 configuration
Item
Remark FR (frame relay) has two formats,
FrFormat FR
PCM_30 and PCM_31. No matter which one is used, it should be fit for SGSN. There are two code classes, including
CodeClass
hdb3 and ami. No matter which one is used, it should be fit for SGSN. The Gb-interface frame has two
FrameType
ClockMode
types,
including
pcm_df
and
crc4_mf. No matter which one is used, it should be fit for SGSN. The clock mode is configured as “master” in SGSN. In PCU, it is
2016-07-05
HUAWEI Confidential
Page 60 of 112
GSM BSS Swap Guide
For internal use only
configured as “slave”. The timeslot occupied by bearer channel must be consistent with the
TimeSlot
data configured for BC at the SGSN side. It stands for data link connection
DLCIType
identifier and it must be consistent with that in SGSN. FR mode has two types, including
BC configuration
DTE and DCE. No matter which one FR Mode
is used, it should be corresponding to SGSN. Generally, it should be configured as “DTE” in PCU. The RF protocol must be fit for
FR protocol
SGSN.
You
are
configure it as “q933”. Generally, a NSE NS-VC
PVC
configuration
suggested
to
should
be
configured the PCU and each BSC NSEI
that is connected to the PCU. The NSEI must be consistent with that configured for the SGSN. Cell ID is 15 bytes or 16 bytes in length. The first 5 bytes (when the cell ID is 15 bytes) or the first 6 bytes (when the cell ID is 16 bytes)
CellID
should be BCD. The last 10 bytes should be hex and must be consistent
Cell data
with the cell ID of the SGSN. In addition, the last 10 bytes should also be corresponding to CGI. BSSID is used to identify one BSS BSSID
from another. It should be consistent with the data configured for SGSN.
4.3 Customer Suggestion You should collect customers’ suggestions on network parameters and service features. If contradiction is found in the suggestions, you should communicate with the customer for confirmation in advance.
2016-07-05
HUAWEI Confidential
Page 61 of 112
GSM BSS Swap Guide
For internal use only
Chapter 5 Network Swap Preparations After the completion of equipment test, you can prepare for the network integration. This section introduces the network swap preparations.
5.1 Network Swap Solution Design and Review 5.1.1 Overall Swap Solutions If a network includes multiple network elements, you should output the overall swap solutions first. Generally, the overall swap solutions should contain the following points:
Introduction of the original network, including networking mode, network configuration, network identifier, network characteristics, and swap difficulties.
Introduction of the swap characteristics and order.
Swap principles, such as security, smoothness, low cost, and high efficiency.
General swap ideas based on the characteristics of the original network.
Technical solutions used to swap each network elements, including M2000.
Technical parameters used to swap each network elements.
Precautions about the network swap.
Conclusion.
5.1.2 Designing and Reviewing the Solutions Used to Swap Network Elements After installing the equipment and finishing the test and after the completion of network swap planning, you can begin to design the solutions used to swap network elements. For the specific solutions of swap implementation, see Chapter 6. The whole solutions include network swap planning report and network integration solutions.
A swap project will affect the BTS configuration and combination mode, so you should implement the swap according to customer’s requirements specified in tender document. In addition, you should also provide the coverage and capacity solutions based on full communication with the customer.
Generally, the coverage should become better after swap. However, you should thoroughly analyze the tender document before beginning the swap. For some rigorous requirements beyond engineering capability, you should explain the reasons to the customer and give reasonable suggestions. In this case, R&D engineers, RNP engineers, and marketing engineers should cooperate with each other to design a competitive solution.
2016-07-05
HUAWEI Confidential
Page 62 of 112
GSM BSS Swap Guide
For internal use only
On-site engineers should be familiar with all the coverage solutions provided by Huawei and use the applicable one according to actual conditions.
Design the detailed swap solutions, including technical solutions, changeover solutions to swap failure, swap planning, and personnel responsibility matrix. In addition, forms used for subsequent test are needed, such as dialing test form, data check form, etc.
When designing network integration solutions, you must take all the possible risks into consideration and communicate fully with the customer on these risks beforehand. The swap solutions designed for large networks must be submitted to the technical support engineers of the related regional divisions and the HQ for review before implementation. The purpose of the review is to ensure the rationality, application, and correctness of the solutions. Generally, after completing network swap planning report and integration solution, the on-site project team should send the report and solution to the project monitoring owner and the owner should organize the engineers concerned to review them. (The project monitoring owner can be the project manager and the technical owner. If there is no project manager, you should send the report and solution to the related product manager and RNO manager.). Note that the review results should be copied to the related technical support engineers. For key projects and sensitive projects, the on-site project team should organize R&D engineers, RNP engineers, marketing engineers, and GBSS technical support engineers to hold a meeting to review the project. After the meeting, a review summary is needed. To win the customer’s acceptance and recognition of the swap project, you should communicate fully with the customer on the reviewed swap solutions.
5.1.3 Swap Plan and Customer Confirmation You should design an applicable swap plan based on manpower resource and confirm the cooperation affairs from the customer, or you can work together with the customer to design the swap plan.
5.2 Network Swap Preparations 5.2.1 Coordination Meeting and Customer Cooperation You should submit the swap solution to the customer before integration and hold a swap coordination meeting at the necessary time. Hereunder lists the confirmation points:
The swap solution must be recognized by the customer.
The time to start and end the swap; and the mark for successful integration and changeover conditions.
The responsible swap persons of the customer and Huawei; the responsibility matrix of project teams; and manpower arrangement. A dispatch management team should be set to coordinate the implementation of the whole project. A supervisor and a skilled engineers should be allocated for each project team. In addition, a standby team must be available. 2016-07-05
HUAWEI Confidential
Page 63 of 112
GSM BSS Swap Guide
For internal use only
Resource requirements, such as vehicles, test MS, test card, emergency lamp, and multi-
meter, light emitting diode, standby transmission equipment, standby board, keys, and other common tools. Customer’s coordination departments and related affairs.
When swapping the network, the engineers responsible for transmission, switch, and BSC should cooperate with each other. The following table gives the responsibility matrix. No.
Cooperation department
Cooperation affairs Debug the A-interface transmission and Abis interface transmission for
1 2 3 4 5
Transmission Switch
BSC and debug the Abis interface transmission for BTS. Cooperate with the project team to modify the related data during swap. Modify adjacent cell relationship and take measures to change the BTS
Original BSC Customer’s BTS
back to the original state if integration failure occurs. Coordinate with the project team to integrate BTS and check if the BTS
engineer
works normally after swap. Provide DT and CQT; handle problems in time; and optimize the network
RNO
after integration.
5.2.2 Integration Difficulty Analysis and Emergency Measures You should evaluate possible risks and difficulties before network integration and design corresponding emergency measures. For details, see the last chapter of this document. In addition, you need to foresee what should be done if failing to integrate the network.
5.2.3 Personnel Arrangement, Vehicle Arrangement, Test Tool, Installation Tool, Equipment Preparation, and Emergency Measure I. Personnel Arrangement Network swap is a systematic project, so on-site owners should make good personnel arrangement. Generally, Huawei personnel can be divided into the following groups:
Leader team
It is responsible for communication, guidance, and resource coordination. Generally, a leader team consists of PM and local marketing and service leaders.
BSS project engineering team
It is responsible for implement the swap project. Generally, this group consists of general technical owner, BSC supervisor, BTS integration test personnel. (Partner’s engineers are usually responsible for the integration test.)
Emergency/standby group
If a project team cannot finish the corresponding task due to unexpected reasons, the emergency/standby group will continue the task. In addition, the emergency/standby group is also responsible for the equipment delivery and test. 2016-07-05
HUAWEI Confidential
Page 64 of 112
GSM BSS Swap Guide
For internal use only
RNP&RNO team
It is responsible for network planning and optimization and it consists of Huawei engineers and partners’ engineers.
Support team
It consists of the experts from regional divisions and Huawei HQ and R&D experts. These experts are responsible for emergency cases.
Customer’s cooperation group
The customer should arrange the contact persons for each group mentioned above and a general contact person. In addition, technical engineers responsible for transmission debugging, data modification, problem elimination, and network changeover are needed. For the information of personnel arrangement, it should be provided according to the following table. Role Customer’s
Name
Telephone
general
coordinator Huawei general owner
Responsibility Monitor and coordinate the whole swap project. Arrange and dispatch Huawei engineers. Coordinate the personnel, vehicle, SIM card, dialing test, etc. Cooperate with Huawei engineers on BSC integration, transmission, and dialing test. Responsible for BTS integration, equipment room entry, and lighting. Responsible for MSC cooperation and BSC
Customer’s cooperation
cooperation.
personnel
Customer’s RNO engineers are responsible for cooperating with Huawei engineers on DT and parameter adjustment. In addition, they should monitor the network quality on the next
day
after
integration
and
handle
emergency cases. Responsible for on-site BSC integration and acceptance. Responsible for on-site BTS integration and check. Owner of network optimization. Responsible for DT after integration and monitoring the Huawei BSS integration
network on the next day after integration and
personnel
handling emergency cases. Support BSS/NSS/GPRS/M2000
at
the
remote end. Responsible
for
MSC
cooperation
if
necessary. Automotive personnel
2016-07-05
HUAWEI Confidential
Page 65 of 112
GSM BSS Swap Guide Role
For internal use only Name
Telephone
Responsibility
Note: Two engineers are needed in BSC room. One is responsible for BSC test and A-interface dialing test. And the other is responsible for confirming the identifiers of A-interface port and Abis-interface port and debugging BTS.
Generally, a team is responsible for integrating two BTSs at most. And the personnel arrangement depends on actual conditions.
II. Vehicle Arrangement Vehicles are used to perform DT and send BTS personnel. The vehicle arrangement should be finished several hours before integration. Generally, each DT team needs a vehicle. For other cases, the vehicles are arranged according to actual conditions.
III. Test Tool and Installation Tool Tool Digital power meter
Purpose Test TRX transmit power
Remark When
Match-terminated line
Used for power test
cannot
be
connected, the match-terminated
Test the standing wave of the Site Master
antennas
antenna and feeder system and locate antenna failure.
line can function as the antenna. Pay attention to the connectors of the matching cable and configure straight filter when installing tower amplifier.
It is used for dialling test and checking Test MS
relationship,
if
the
cell
handover
direction,
and
frequencies are consistent with the
It is used together with the test
designed ones. They are used for the connection
card.
between the equipment room and the dispatch center when the BTS is Other operators’ SIM cards
unavailable during integration. Note that
Portable computer BTS local maintenance line
you
should
have
a
It is used to ensure smooth
understanding of the coverage of the
communication during network
original network first. It is used for local maintenance and
swap. Serial port, BTS maintenance
upgrade. It is used to connect the TMUs of
software, and BTS host software.
each site.
Cutter Screwdriver
Cross
screwdriver
and
shovel
screwdriver It is used to measure the voltage of
Multi-Meter
the BTS and the current of the tower
Light Emitting Diode
amplifier. It is used to check if the transceiver
2016-07-05
HUAWEI Confidential
If there is small BTS, you should use special screwdriver.
Page 66 of 112
GSM BSS Swap Guide
For internal use only is normally connected.
8/10 ejector lever 12-inch adjustable wrench Packet lamp 120-Ω clamp tool 120-Ω jumper
connector
is
used
to
connect
feeder
connectors. It is used for night swap. It is used for 120-Ω transmission. It is used for 120-Ω transmission. It is used to make the connectors of
Electric iron Feeder
It
making
tool
75-Ω transmission cable. It is used to make connectors of feeder and jumper.
IV. Spare Part Preparation The spare parts should be prepared according to field needs. The spare parts of the BSC, BTS, TRX, and TMU should be available. Generally, the spare parts are included in contract; otherwise you need to prepare the related spare parts in advance and take them to the field at the integration night.
V. Emergency Measures The emergency measures must be made in advance.
5.2.4 Version Confirmation and License Application You need to check if the current version support the functions required in the contract and check if the old license can still be used. Note that the software versions should match BSC, PCU, BTS, and M2000. For the project supervisors, they should apply for the correct software version through related electronic process. And the versions are available after the corresponding technical support engineers have reviewed the application.
5.2.5 Swap Data Design and BTS Swap Preparation I. BSC Swap Data The BSC swap data includes the data of the Huawei BSC and data of the BSC of the original network, the former of which should be prepared by Huawei engineers and the later of which should be prepared and collected by the customer. Huawei BSC data includes adjacent cell relationship and MSC interconnection data. You
need to confirm if the Huawei data is supported by the customer. In addition, you should note that if the BSCs of the original network are under the control of one MSC and if the LAI and CGI of the original network can be reallocated. For the BSC data of the original network, you need to modify the handover-related data only.
That is, add adjacent cell data to the original cells that have been swapped and configure the Huawei cells as adjacent cells of the ordinal cells. Hereunder introduces the steps to design Huawei BSC swap data: 1)
Submit the reviewed RNP&RNO data to the project supervisor
2016-07-05
HUAWEI Confidential
Page 67 of 112
GSM BSS Swap Guide
For internal use only
After the RNP&RNO data has been reviewed, you should submit the RNP parameter design report to the project supervisor. For details, see the previous introductions. 2)
Design BSC hardware data, BTS hardware data, interconnection data, and network planning data. After that, the project supervisor should check the data according to the following instructions:
If the data is fit for the version used for deployment.
If all the data is correctly designed.
If the configuration data of the BSC hardware is consistent with the designed file. For example, the position of the transparent BIE must be fit for the actual connection and the FTC board configuration must also fit the actual connection.
If the type and port configuration of the BTS are in accordance with the actual connection.
If external cell data is added to Huawei data. In addition, if the parameters (such as phase mark and CIC) related to A-interface are necessary.
Make sure that the data can be normally converted on BAM.
Make sure that if the functional hardware supports related functions, such as half rate function, and check the corresponding 14FTC/34BIE.
3)
Check DBF data
After designing the project supervisory data, you should submit the DBF data to the network planning owner for review. And the network planning owner should use OMC program and Nastar to check the DBF data. In addition, the network planning owner should also check the followings:
If each algorithm is fit for planning design.
If all the parameters are configured and correct.
If the values of the parameters are greater than the suggested values.
If the adjacent cell data is completely and correctly configured.
If the configuration of half rata and MAR is fit for the design.
If any abnormal information is found, you should correct the information. After that, create an “Autocfg.dat” and put all the above information into the file. And this file should be sent to engineering personnel for loading.
II. MSC Data The destination (signaling) point code of the LAC and CI of the BTSs to be swapped should be changed. Since the BTSs will be under the control of other BSCs after swap, the destination (signaling) point code stored in the MSC database should be changed accordingly. To ensure the smooth interconnection and interworking, you should confirm the information of the Huawei BTSs that need to be added to the original system. In addition, you should also confirm that the CGIs and LACs of all the cells are defined in MSC. Note that the definitions of CGI and LAC vary with operators, so you need to check them one by one. If cross-province handover or cross-region handover will appear, you should notify the customer to modify the related information after the integration of the network. 2016-07-05
HUAWEI Confidential
Page 68 of 112
GSM BSS Swap Guide
For internal use only
For packet service, you need to confirm the data related to LAC and SGSN. For prepaid service, you need to consider if the routing information of the prepaid subscribers should be modified.
III. PCU Data You need to check the following data:
IP address configuration (If the IP address is correctly configured.) Routing information (If the routing information is correctly configured.) Hardware data configuration (If the POMU board, RPPU board, L2PU board, and PMC board are configured at the corresponding slot.) E1 slot configuration (If the RPPU board number, E1 number, and E1 sub-slot number are correctly configured. And if the E1 slot configuration at the PCIC side is consistent with that of the BSC side.) LAPD link configuration (If the link configuration is consistent with that configured at the BSC side.)
ATTR data configuration (Pay attention to check the configuration of CGI and routing area.)
GPRS data configuration (Pay attention to check the network mode of operation and other defaulted values.)
Dynamic adjustment parameter configuration (CS type and license restriction)
PDCH parameter configuration
E1 configuration at Gb interface (Pay attention to the load sharing principle, the backup principle, clock, frame format, code, and other interconnection parameters.)
BC configuration (Pay attention to the configuration principle and interconnection setting.)
NS-VC configuration
Cell data configuration at Gb interface (CellID and BSSID)
IV. SGSN Data The SGSN data is mainly prepared for PCU swap.
V. BTS Integration You need to get the key to the equipment room. The BTS integration is performed according to BTS survey, but you can finish the preparations in advance. If many BTSs are to be integrated, you need to carry computers to load the software; otherwise the load at the BSC side will become heavy.
VI. Network Optimization Integration Preparations After testing the original equipment, collecting the swap data, and planning the frequencies and parameters, you should confirm the test time, place, and lines for the integration. For details, see RPO401-01 DT preparation self-check list (G/C/W).
2016-07-05
HUAWEI Confidential
Page 69 of 112
GSM BSS Swap Guide
For internal use only
Note: A work memo is needed for data design and modification. The memo should include modification contents, required feedback time, name and ID of engineering personnel, engineering time, etc. At last, this work memo must be confirmed and loop closed.
In addition, you should confirm the transmission according to the following instructions:
The labels of the A-interface, Abis-interface, and Gb interface (the three interfaces locate at the GBSS side and GBSS is installed on DDF rack) are confirmed and placed in due position.
The trunks are normal and the status of the indicators of BIE board and MSM board is normal.
A-interface transmission is fit for CIC configuration according to project file and data.
The connection between each BTS and the concatenation relationship of each are correct according to project file and data.
Enough jumpers should be prepared.
The A-interface transmission at the MSC side and the Gb interface transmission at the SGSN side should be confirmed.
5.2.6 Pre-integration Pre-integration is often used in a swap project. You should judge if the pre-integration is necessary according to actual conditions. If yes, the pre-integration should also be implemented according to strict steps and plans. If any problem is found according to the pre-integration, you should correct them and make a conclusion immediately. All the information collected according to the preintegration should be sent to the related experts for analysis. If the pre-integration results are very good and win the customer’s reorganization, you should begin formal integration. Before designing the pre-integration solutions, you can communicate with the customer in advance to reach an agreement on the integration.
2016-07-05
HUAWEI Confidential
Page 70 of 112
GSM BSS Swap Guide
For internal use only
Chapter 6 Swap Implementation This chapter introduces the swap implementation. Since there is time restriction on network integration, detailed arrangement and test are important. Hereunder lists the points that need special attention: Network swap is a systematic project. To finish the whole project, you need the customer’s
help. Therefore, the project team should be well managed and the clear responsibility matrix should be divided. According to past experiences, transmission debugging has the greatest effect against the
swap project, because it can only be performed at the swap night. Therefore, you need to fully communicate with the customer on whether to delay the network integration if the transmission conditions are not met. Customers often pay much attention on duration during network swap. For Huawei,
however, to enhance the customer satisfaction rate, engineers should ensure the engineering duration, quality, and cost.
6.1 Network Integration on the Swap Day 6.1.1 Network Integration Schedule The following table details the network integration schedule and responsibility matrix. Product
Time
Owner
Responsibility
Technical sup
If on-site engineers need remote support,
port engineers
technical support engineers should notify the related department to make preparations in time and provide the integration solution and data in advance. Note that the technical support
The day before sw
engineers for network integration include the
ap PM
RNO technical support engineers. Organize integration coordination
meeting,
deciding integration time, and confirm other precautions with customer, including vehicle arrangement, test tool, personnel cooperation, Daytime
of
the
swap day
Technical ow
contact method, and internal problem reporting. Hold a meeting participated by all the engineers
ner or PM
related to the project to detail the integration arrangement, announce the integration time and
BTS
BTS personne
contact method. Check if BTS has been in the equipment room
l/customer
and if the key to the room is available; Check if all the hardware is present when
2016-07-05
HUAWEI Confidential
Page 71 of 112
GSM BSS Swap Guide
For internal use only arriving at the engineering site and finishing the related preparations; Print the integration steps and precautions. RNP&RNO engineers prepare for DT, confirm
RNP
DT data and DT line with the customer, and Each network el
assign the DT task to partner. Check the health condition and status of all the
ement
equipment, and check the necessary terminal
Transmission co
tools and components. Reconfirm the transmission with the customer.
nfirmation
If the transmission conditions are not met,
22:00 o’clock of
PM or general
cancel the integration. Communicate problems with the customer’
the swap day
technical
senior management layer.
support
General coordinator for on-site affairs.
coordinator General
Actual integration, problem collection handling,
technical
HQ contact person.
support
and
experts
of
each network element Integration problem handling and A-interface int erconnection. Supervise engineers to enable BTS; Perform dialing test for CS/PS; Check if the antennas of some cells are inversely connected; Check if it is necessary to use test MS to test the BSS
environment around the BTS; Check if the frequency information is consistent with the corresponding cell; Locate BTS problems. Monitor alarming information
and
traffic
statistics. Monitor and coordinate the implementation RNP
progress. Monitor the BSS; Perform CS test;
MSC
Collect and analyze the DT data of each region. Check A-interface interconnection; Add handover relationship; Monitoring signaling; Analyze alarming information. Analyze traffic statistical data and bill data; Locate and handle problems; Monitor signaling. Cooperate with each other for related test;
2016-07-05
HUAWEI Confidential
Page 72 of 112
GSM BSS Swap Guide
For internal use only Check UMS alarming information; Coordinate with each other to handle DDF problems. Observe the equipment;
PCU
Cooperate with each other for related test; Correct user data; Check alarming information; SGSN
Monitor each registered cell number. Gb-interface interconnection and test.
M2000
OMC management;
The day next to
PM
swap
Problem checking and handling. Customer communication; Integration confirmation Watch equipment room;
All
Check alarming information; Analyze traffic statistics; Respond to user complaints. Continue drive test (data services, such as GPRS
RNP
and EDGE, should be tested); Compare and analyze the data before and after the drive test; Optimize related parameters.
6.1.2 Checking Each Network Element (Before Integration) I. Checking GBSS Running Status You should record the running status of the system before integration, including the alarming information, traffic statistics, and the running status of each board and BTS. 1)
Query the running status and alarming information of the BTSs attached to the original BSC and record them. Meanwhile, report them to the related personnel of XXX Company and require them to solve the problems affecting network integration as quickly as possible.
2)
Check the status of each BSC board at the maintenance console and check if the indicator of each BSC board is correct.
3)
Check the status of the relay circuit of the A-interface. The NSS engineers of XXX Company should cooperate with Huawei engineers to query the status of the relay-circuit of the Ainterface at the MSC side.
4)
Check the status of each No.7 signaling link and query the status of LAPD link.
5)
Check the status of each enabled BTS, BTS board, and channel. (For example, check if there is congested channel.)
6)
Check the status of special equipments, such as the semi-permanent connection equipment and timeslot extraction equipment.
7)
Check if there is other abnormal condition.
2016-07-05
HUAWEI Confidential
Page 73 of 112
GSM BSS Swap Guide
For internal use only
II. Confirming GPRS Status At the BSC side, you need to check the status of the corresponding LAPD link. If the status is multiframe setup, the communication between BSC and PCU is normal. You are suggested to sample some BTSs to check the PDCH status at the maintenance console. If you need to log in to PCU, you can query the working status of the PCU with the guide provided by related support engineers according to Appendix 4.
III. Checking the Status of Related Network Elements The status of the A-interfaces of the MSC and SGSN, the signaling status, and the CPU load must be checked.
6.1.3 BSC Integration This section details the work that should be finished in the equipment room.
Work related to BSC After confirming that the BSC hardware runs normally, you should load the integration data and check if the status of the BSC is normal after integration. In addition, you need also check if each BSC board runs normally, if there is important alarm, if the traffic statistical indicator is normal, and if there signaling is normal.
Work related to A-interface The A-interface resource is scarce, so you should expand the network capacity at the integration night. In this case, you need to confirm the transmission for A-interface expansion and check the A-interface circuit status.
Work related to BTS cooperation After BSC runs normally, you need to notify the engineers concerned to begin BTS integration; Confirm the transmission interface of the original BTS; Pay attention to use light emitting diode to confirm the relationship between transmission and reception; Notify the engineers concerned that the new BTS and the original BTS can be disconnected. After Huawei BTS is powered on and the transmission of the BTS becomes normal, you should check the running status of the BTS at the BSC side. If necessary, you need to force the related software to be activated. If any problem is found, you can coordinate the BTS supervisor to solve the problem together.
Work related to MSC coordination Confirm that the data of the location area of the corresponding MSC has been set.
Check if the traffic statistics, alarm, and maintenance function of the M2000 network management system are normal.
Register and observe traffic statistics Generally, the following tasks should be registered at the traffic statistics console, including BSC overall performance measurement, CPU performance measurement, MTP link performance measurement, SDCCH performance measurement, TCH performance 2016-07-05
HUAWEI Confidential
Page 74 of 112
GSM BSS Swap Guide
For internal use only
measurement, random access performance measurement, intra-cell handover performance measurement,
power
control
performance
measurement,
call
drop
performance
measurement, Rxqual performance measurement, Rxlev performance measurement, cell performance measurement (2), cell performance measurement (3), TRX call drop performance measurement, and A-interface relay performance measurement.
Register the traffic statistical tasks reflecting KPI at the MSC and SGSN.
Alarm query and analysis; alarm solution; abnormal alarms related to BSS; important alarms related to BSC.
Check the status of the corresponding network element is normal.
Cooperate with the related engineers to handle BTS problems.
Cooperate with the related RNO engineers to correct data.
Record abnormal problems.
6.1.4 MSC-Related Work during BSC Integration I. Debugging A-interface The A-interface data should be debugged at the night (from 23:00 to 3:00). In addition, you should test if the MS can access the network and if the location update and handover can be performed normally. The overall dialing test contains various services, including intra-office call, calls corresponding to each handover, toll call, and intelligent service. Moreover, you should verify if each call procedure is correct.
II. Integrating BSC after A-interface Debugging To ensure that the transmission between BSC and Huawei MSC is available, you should perform overall dialing test. The test contains various services, including intra-office call, calls corresponding to each handover, toll call, intelligent service, call transfer, etc. If there are multiple BSCs to be integrated, you can perform the integration by steps. During BSC integration, you need to pay attention to the following points: If several BSCs belong to the same MSC in the original network, the BSCs must be
integrated to the new MSC in one time.
The handover data applied to the old MSC and new MSC must be adjusted.
During the integration, both the old and new MSC are valid. In this case, you should preserve adequate inter-change circuit according to the traffic between the old MSC and new MSC.
III. Conclusion Hereunder summarize the MSC-related work needs to be done during GBSS integration. The seamless cooperation between MSC and GBSS is the key to a successful swap. 1)
Test phase The customer needs to prepare redundant E1 for A-interface. The E1 must be interconnected with Huawei BSC when the BSC and BTS are powered on. The data related to Huawei BSC
2016-07-05
HUAWEI Confidential
Page 75 of 112
GSM BSS Swap Guide
For internal use only
must be added to the core network and interconnected with A-interface. Note that all the services must be tested. 2)
Integration preparation
Huawei is responsible for BSC-side transmission, and the customer is responsible for transmission layout and debugging from core network to DDF rack.
The data related to BSC integration must be made at the core network.
Adjacent cell relationship must be designed before the swap of BSC and MSC. If there is cross-MSC cell, you need to design the adjacent cell relationship at other MSCs. If some BTSs are not successfully swapped, you need to recover the data and adjacent cell
relationship related to the corresponding BTSs. If new LAI is used, the new LAI must match the charging information and intelligent service
if the information and service are available. 3)
Resource requirements at the core network Switching side personnel
DDF rack
Power supplier
Relay device (2M)
Relay signaling
Test card and test MS
Dialing personnel
Personnel cooperating with the modification of MSC-related data
Pre-paid service debugging and voice resource test
6.1.5 BTS Integration BTS integration involves multiple scenarios. Whether there is adequate room for BTS installation, whether there is standby transmission equipment, and whether the direct current power supply is available are three main factors affecting the BTS integration. The antenna feeder does not affect the integration because it will not be installed at the integration night. Eight possibilities are included in the three factors. Hereunder details the BTS integration:
Disassemble the original BTS. The disassembly has no side or negative effect against the network.
Prepare the related tools and vehicles before integration. After the arrival of the integration team, the BTS door should be opened and the light in the equipment room should be enabled. In some special cases, engineers must get the permission of the third party before entering the equipment room, so you should explain this to the customer and make preparations in advance.
Only the direct current power supply cabinet is discussed in this document. For alternating current input, you need to communicate with the customer in advance.
2016-07-05
HUAWEI Confidential
Page 76 of 112
GSM BSS Swap Guide
For internal use only
To enhance working efficiency and increase test time, you must finish the related work
before integration. In some places, you have to move not only the BTSs to be swapped but also other networks
or power supply equipment. In this case, you need to communicate with the customer on this action. The partner is always responsible for BTS integration, so you must take measures to ensure
the engineering quality
I. Installation Steps This section introduces the steps to install the BTS when no standby transmission, no power supply cabinet used for replacement, and no position restriction. After the arrival of the BTS, you need to check the places where the power supply cable is long or the transmission needs to be re-arranged in advance. 1)
After confirming the BSC port, confirm that the BTS-side transmission port is correct through self-loop test.
2)
Disconnect the power supply of the BTS and move out the original power supply cabinet and BTS. When moving out the BTS, you do not have to move the connection line and antenna feeder so that that the BTS can be changed back to the original position in emergency conditions.
3)
Finish installing Huawei power supply cabinet, power on the cabinet with alternating current, and observe the running status of each module. After that, disconnect the power supply.
4)
Install Huawei BTS at the corresponding location; connect the transmission line, power supply cable, and grounding line. If the time is urgent, you do not have to fix the BTS and secondary installation is allowed.
5)
When Huawei BTS is powered on, observe the status of the indicator.
6)
Connect transmission to Huawei BTS and check if the status of LIU1 is normal. After the transmission is normal, check if the BTS runs normally. During this period, do not disconnect the power supply of the BTS. If software needs to be upgraded, you need to notify the BSC to upgrade the related software or perform near end upgrade.
7)
After the BTS runs normally, you can connect the jumpers and the lightening protector. If the time is urgent, you do not have to fix them and secondary installation is allowed.
8)
Finish the standing wave test from the CDU interface is necessary. No instrument can be used to observe the standing wave indicator of the CDU.
9)
After the BTS is initialized, perform dialing test and handover test. In addition, you should test power and confirm cell direction. Other ATP tests can also be performed.
10) If all the test results are normal, you should perform drive test for network optimization. If there is no problem, it means that you have succeeded in integrating the network. 11) For the convenience of network maintenance, you should paste labels for the corresponding cells. 2016-07-05
HUAWEI Confidential
Page 77 of 112
GSM BSS Swap Guide
For internal use only
12) Finish connecting the match heads and EAC; install the sensor; and test the EAC connection and function. 13) Install battery or battery rack. 14) If the drive test results are normal, it means that the BTS has been successfully integrated. 15) Package the old equipment if necessary. 16) Collect the test record and tool; tidy up the engineering field, and return the key.
II. BTS Swap Steps Hereunder provides a swap example, which specifies the BTS swap steps: 1)
Shut down the original BTS
When arriving at the engineering field, the BTS integration team should phone the transmission changeover team and shout down the power supply of the original BTS. Generally, this action is taken at 00:00 or later. In this case, Huawei should wait for the xx company to make preparations, and the xx company is responsible for shutting down the original BTS. 2)
Integrate BTS power supply
After confirming that the polarity, voltage, and label of the power supply are correct, you can connect the power supply to Huawei BTS. In this case, Huawei is responsible for providing power cable and putting the cable near the equipment room, and the xx company is responsible for removing the power supplier of the original BTS and connecting the Huawei BTS power supplier. 3)
Integrate Abis interface relay
Disconnect the Abis interface relay (2M) from the original equipment and connect it to Huawei BTS through DDF rack. In this case, Huawei is responsible for providing the transmission from BTS to DDF rack, and the xx company is responsible for removing the transmission between the original BTS and BSC and connecting it to the DDF rack for Huawei BTS. 4)
Check BTS installation and power-on the BTS
After the power supplier and transmission are connected, you need to confirm that the Huawei BTS is well installed, and then power-on the BTS. Huawei BTS will send loading application to BSC after performing self-check. In this case, Huawei is responsible for checking the BTS installation, powering on the BTS, and testing the BTS transmit power. (The connector of the lightening protector is the test interface, so you need to check if the power fluctuates at each connector, because the power should keep stable. Note that digital power meter is preferred.). And the xx company is responsible for cooperate with Huawei in the test. 5)
Dial test phone
2016-07-05
HUAWEI Confidential
Page 78 of 112
GSM BSS Swap Guide
For internal use only
After the BTS has finished loading data automatically and all the cells are available, you should perform dialing test. The called numbers are decided by test engineers. Ten calls should be made for each cell. Finally, you need to send the test results to the BSC maintenance team. In this case, Huawei needs to cooperate with the test engineers to solve problems occurred during the test, and the xx company should perform the dialing test according to plans and confirm the BTS working status. 6)
Integrate antenna feeder system
After the dialing test, you can integrate the antenna feeder system. That is, remove the indoor soft jumper of the original antenna feeder and connect the corresponding antenna feeder to Huawei BTS. In this case, Huawei is responsible for providing BTS interface for the jumper and finishing standing wave test. (The test interface locates at the CDU antenna connector. so you need to check if the standing wave ratio fluctuates at each connector, because this ratio should keep stable.). 7)
Check drive test
After all the BTSs are integrated, you can perform drive test for them. The test contents include cell direction, signal strength, handover, and interference. In this case, Huawei RNO engineers should perform drive test to check the coverage quality, and the xx company should provide vehicles and cooperate with Huawei RNO engineers in the drive test. 8)
Analyze the integration
To have an overall understanding of the network after integration, you can analyze the drive test results. The test results can work as reference for next-phase network optimization. In this case, Huawei is responsible for analyzing the coverage quality after BTS integration and providing reference data for the next-phase network optimization, and the xx company is responsible for analyzing the network quality after BTS integration and putting forward network optimization requirements. 9)
Deal with original BTS
Huawei engineers are not responsible for dealing with the original BTS. The xx company is responsible for dealing with these old goods either by themselves or with the help of the third party.
6.1.6 PCU Integration Pb interface (it is defined by Huawei) connects PCU to BSC. Before integrating PCU, you need to debug the Pb interface. For details, see the related deployment guides.
2016-07-05
HUAWEI Confidential
Page 79 of 112
GSM BSS Swap Guide
For internal use only
I. Gb Interface Integration Steps and Precautions 1)
Check Gb interface data configuration, including E1 configuration, BC configuration, NCVC configuration, and cell configuration.
2)
Check hardware connection to make sure that the Gb interface board is inserted at the right position.
3)
Test transmission self loop to make sure that the E1 line is correctly configured for Gb interface.
4)
Check E1 connection. If the green light of the PMC board flashes slowly, the E1 connection is normal.
5)
Check BC state through “mt fr bc show statinfo all”. If the link consistency check is available and the user is not blocked, it means that the BC state is normal.
6)
Check the NSE state through “MT BVC SIG SHOW ” to see if it is normal.
7)
Check the NSVC state through “mt nsvc showstate ”. If the NSVC is unlocked, it means that it is normal.
8)
Check the Signal BVS state through “mt bvc signal show state ” to see if it is normal.
9)
Check the PTP BVC state through “mt bvc ptp show state {|all” to see if it is normal.
II. Traffic Statistics Indicator Registration (PCU) You are suggested to register traffic statistics indicators related to PCU. The seven indicators reflecting the running condition of PCU must be recorded, including BSC overall performance measurement,
Pb
interface
performance
measurement;
G-Abis
interface
performance
measurement, Um interface performance measurement, etc. The six indicators reflecting the cell details are recommended. For the following indicators, the ones in black must be registered, and the others are optional. CPU measurement BSC overall performance measurement G-Abis interface performance measurement Pb interface performance measurement Cell performance measurement: packet assignment performance measurement; uplink TBF setup and release performance measurement; downlink TBF setup and release performance measurement; PDCH resource performance measurement; PDCH peak value performance measurement, uplink RLC data transmission performance measurement, downlink RLC transmission performance measurement, radio channel performance measurement, resource maintenance performance measurement.
2016-07-05
HUAWEI Confidential
Page 80 of 112
GSM BSS Swap Guide
For internal use only
6.1.7 Network Optimization Arrangement The test performed at the swap night is to check if the services are normal and if there are serious problems. DT lines should cover each cell and the areas covered by the major lobes of the cells. At least the bi-directional handover between the edge of one cell and its adjacent cell should be tested. Since the network integration is often performed at the night; you may not access some areas or section. In this case, you should plan the DT line in advance. According to the DT, the coverage should become better after network integration. In addition, cell parameters should be correctly set, and the frequency and handover should be normal. If some adjacent cells are missing or the antenna feeder is inversely connected, you should contact the project team immediately. The baseband frequency hopping will stop if there is any TRX problem. Therefore, if you discover the problem of this kind during the test, you should contact the project supervisor immediately. In addition, you should check if the GPRS function is available for the GPRS cells. Note: The RNO team and project team should tell each other the contact persons responsible for the integration in advance. After enabling the BTS, the project team should notify the standby DT team to perform drive test. And the project team should wait for the DT results. If the DT team finds any problem, they should tell the project team to solve the problem immediately. If the project team has multiple BTSs to be swapped at that night, the nearby BTSs should be swapped first. In this case, the project team should notify the DT team to perform the drive test after the all the BTSs are swapped. And the project team should still be present in the field to wait for the DT results.
6.2 Emergency Measures and Changback for Network Integration 6.2.1 Emergency Measures I. Emergency Measures for BSC If you meet difficult problems, you can seek help from the technical support engineers of Huawei to locate the problem. Meanwhile, BSC supervisor must monitor the data such as interface messages and BTS log for further analysis. If the problem cannot be solved within the time required by the customer, you should change back the transmission to the original BTS; otherwise normal communication will be terminated.
2016-07-05
HUAWEI Confidential
Page 81 of 112
GSM BSS Swap Guide
For internal use only
II. Emergency Measures for BTS If you find any problem concerning BTS transmission, you should notify the problem to the engineers responsible for guaranteeing transmission. If there are bad components or boards, the BTS emergency group must replace them immediately. If the Operation and Maintenance Link (OML) or Radio Signaling Link (RSL) cannot be established, you should contact the engineers responsible for BSC integration immediately.
6.2.2 Changeback Principle Description You need to confirm the time and condition of changeback. Generally, the changeback can be divided into BTS changeback and BSC changeback. BSC changeback should be performed before BTS changeback, so the BSC changeback is a relatively easy task. It is important to find problems through changeback and solve them accordingly for subsequent operation. When designing changeback solution, you need to back up the data to be modified for the original BSC and MSC. During network swap, you are suggested not to modify and delete other data except the data of the original BSC and the adjacent cells, because this is convenient for secure changeback. During changeback, you should pay attention to the following points:
Export the frequency planning data (including frequency hopping, BSIC, etc) according to the backup data of the original network because the data will be used for the changeback. If there is changeback failure, you need to check the frequencies planned at edges.
If the whole swap fails, you can completely use the backup data for the adjacent cells. If the swap for some of the sites fails, you need to design new data for the edge adjacent cells and modify the corresponding adjacent cell relationship between the original BSC and Huawei BSC.
The planning data, such as LAC and CI, should be exported according to the backup data during changeback, because the planning data should be modified in the MSC. When the swap for some of the sites fails and if the planning data such as LAC and CI is different from that in the original network, you need to decide if the LAC and CI should be changed back to the original ones; otherwise the network will be negatively affected.
If the BSC-related data used in the original network does not have to be deleted, you can use the backup data.
The concatenation BTSs should be changed back.
The data related to the changeback BTSs should be modified in the MSC.
6.2.3 Changeback Measures I. BSC Changeback Generally, BSC can be debugged and interconnected successfully in advance, but the possibility for you to test the network at the integration night is small, because the time is urgent and the
2016-07-05
HUAWEI Confidential
Page 82 of 112
GSM BSS Swap Guide
For internal use only
preparations are inadequate. In addition, some important functions are not supported, the important boards fails, or the customer’s A-interface is not in due position. 1)
If all the BSC is changed back and shares one MSC with the original BSC, you should do the followings:
Ensure the A-interface transmission of the original BSC
Recover the data of the original BSC
Recover the MSC data
Recover the data of the BTSs under the control of the original BSC
2)
If all the BSC is changed back and uses another MSC, you should do the followings:
Ensure the A-interface transmission of the original BSC
Recover the data of the original BSC
Recover the data of the two MSCs
Recover the data of the BTSs under the control of the original BSC
II. BTS Changeback If BTS integration fails, it should be changed back to the original status. If the new BTS cannot be opened at the 5:00 a.m or the coverage performance decreases rapidly according to drive test, the BTS should be changed back before 6:00 a.m. In this case, you should do the followings:
Reset the BTS, power supply, and antenna, and check the working status of the BTS.
Reset the transmission.
Modify the neighbor cell relationship between the original BSC and Huawei BSC.
If the two BSC does not belong to one MSC, the inter-MSC handover relationship will be present.
If the CGI is used for route analysis in the MSC, you need to modify the related data.
For the convenience of problem location and analysis, Huawei BTS engineers should record the details and test data, and the BSC supervisor should monitor and save the corresponding data.
6.3 Network Monitoring on the Day Next to Swap The network monitoring on the day next to swap is quite important. You should arrange engineers to monitor the traffic statistics closely and pay attention to the fluctuation of each indicator and customer’s complaints. If there is abnormal conditions, engineers should analyze problem from the following perspectives:
Check if the history alarms of the BTS and BSC are normal, because failures related to transmission, antenna, and board will affect KPI and result in complaints.
Check if the traffic volume in each cell is normal and if there is no traffic at some sites.
Check if the important indicators, such as call drop rate, handover success rate, and congestion rate are normal.
Check if the success rate of the handover between different customers’ equipment is normal.
2016-07-05
HUAWEI Confidential
Page 83 of 112
GSM BSS Swap Guide
For internal use only
Analyze the customer’s complaints and solve them. After solving the problems, you should notice the customer immediately. In addition, you need to create a history record for the complaints to make sure that no problem will be missing.
If no problem is found, the project team should feed back the results (including traffic statistics, drive test, and dialing test) to the customer. In this case, it can be taken that the network has been successfully integrated.
Chapter 7 After-Swap Network Quality Monitoring and Optimization To ensure that the final network acceptance can pass, you should strictly monitor the network quality for a period of time after the swap. The tasks involved in network monitoring include online equipment problem handling, network monitoring, and network optimization.
7.1 Online Equipment Problem Handling 7.1.1 Hardware Problem Handling The hardware problems occurring after swap must be handled immediately; especially the BTSs providing converge for VIP areas should be more carefully monitored. When the project team handles the coverage problems, such inverse connection of antenna feeder and poor Rxlevel, network optimization supervisor or project supervisor should confirm that the problems are really solved. To solve conversation problem caused by board failure, you need to block the OMC and check the utilization of channels and signaling. No alarm will be generated if the performance of some hardware decreases. Once discovering such problem, network optimization engineers should solve the problem with the coordination of BSS engineers. If the traffic volume of a cell is low, the problem may be related to uplink and downlink. If the channel utilization rate is low, call drop rate is high, and there is great interference, the problem may be related to the decrease of the TRX performance and combiner and divider performance.
7.1.2 Complaint Handling Users’ complaints must be handled quickly. Generally, complaints can be divided into the following categories:
Coverage complaints 2016-07-05
HUAWEI Confidential
Page 84 of 112
GSM BSS Swap Guide
For internal use only
Voice quality complaints (one way audio, no audio, cross-talking, call drop, echo, noise, etc)
Service failure complaints (incoming call failure, outgoing call failure, fax service unavailable, etc)
PS complaints (slow network connection, GPRS service unavailable, etc)
7.1.3 Alarm Analysis I. BSS-Focused Abnormal Alarms The following table lists the alarm names according to BSC32. Alarm ID 62 65 84 86 107 113 626 627 311 545 547 559 560 562 571 572 605 612 695 696
Alarm Name Signalling link layer 2 congestion alarm Destination signalling point unavailable alarm Signalling link layer 3 congestion alarm Signalling link unavailable alarm SCCP remote signalling point failure alarm SCCP destination signalling point forbidden alarm Signalling link service interruption alarm Signalling link location failure alarm Digital relay PCM failure alarm Internal flow class change Cell flow control class change BSC reset alarm BSC reset acknowledgment alarm BSC reset circuit alarm MS reset alarm MSC overload alarm BSC unequipped with circuit alarm MSC unequipped with circuit alarm GCKS clock 10 minutes deviated from reference time GCKS clock 24 hours deviated from reference time
Remark Signaling alarm
Relay alarm System load Cell load Circuit failure
Clock source failure
II. Important MSC-Related Alarms The important MSC-related alarms are A-interface relay circuit alarm, signaling link alarm, BSC overload alarm, and BSC reset alarm.
7.2 Network Monitoring and Optimization After swapping the network, you should closely monitor the feedbacks from the customers or users. Generally, users are quite sensitive to the network quality several days after the network integration and may put forward subjective feelings. For example, they may complain that they cannot make calls in the rooms where the signals were weak before the network integration. Or they may also complain that there is great noise, the success rate of the fax service is low, and the data service is unavailable. The reasons for the problems are that the coverage sensitive area decreases, or the network parameters are irrationally set, or the cooperation between operators’ parameters are not satisfactory. These problems must be solved as quickly as possible. If the decrease of the coverage area is caused by improper planning, you need to change the planning accordingly immediately. Note that you should pay special attention to antenna adjustment; 2016-07-05
HUAWEI Confidential
Page 85 of 112
GSM BSS Swap Guide
For internal use only
otherwise new coverage problem will be introduced. To prevent sensitive problems from causing great negative effect, you need to notify marketing personnel to maintain good customer relationship.
7.2.1 OMC Traffic Statistics Analysis You can discover the problems of the original network through monitoring and analyzing the daily traffic statistics. During this period of time, you should try to register as much as traffic statistics that are used for network optimization. In addition, you should pay special attention to the traffic statistics related to traffic volume, congestion, call drop, handover, and interference. Furthermore, you also should compare the traffic statistical indicators before and after network swap. If an indicator becomes worse after swap, you should find out the reasons and improve it.
I. KPI Analysis (Voice Service) In addition to the call drop rate, congestion rate, and handover success rate (for cell-level indicators), you are suggested to pay attention to the following traffic statistical indicators. For TRX-level indicators, you should check the assignment and utilization of SDCCH and TCH in the channel allocation performance measurement and discover the abnormal TRXs immediately. For the statistics in the path balance performance measurement, you need to monitor the uplinks and downlinks of the corresponding TRX. You should integrate the Rxlevel performance measurement and Rxqual performance measurement into consideration, and can analyze the coverage provided by radio signals and also analyze the interference caused by the radio signals as well. For the networks with high load, you are suggested to check the signaling link send occupation percentage (%) and signaling link receive occupation percentage (%) in the MTP link performance measurement, because these two items indicate the signaling load at the A-interface. If the values of the two indicators reach 30% respectively, the signaling link will be congested or signaling may be losing. In this case, you should suggest the customer expand the network. In BSC overall performance measurement, if the PCH overload times for circuit service at the Abis interface and the RACH overload times for circuit service at the Abis interface are great, you should consider readjusting the paging parameters or redividing the location areas. In LAPD performance measurement, if both the pages discarded due to serious LAPD link overload and pages discarded due to slight LAPD overload are not 0, it means that the flow control has been happened during the statistical period. For the network side, you need to check the following changes. If the average timeslot occupation time is quite short according to A-interface relay performance measurement, it is likely that the A-interface relay is inversely connected or mismatched. In this case, users cannot hear the opposite party’s voice, and then hang up. Therefore, each conversation only lasts for a short period of time. 2016-07-05
HUAWEI Confidential
Page 86 of 112
GSM BSS Swap Guide
For internal use only
The cause values of the inter-BSC outgoing handover failure in cell performance measurement (3) can be divided into multiple types and they can be used for the analysis of inter-BSC handover.
II. KPI Monitoring (for Each Swap BTS) You can use NASTAR to monitor the change of the KPIs before and after swap (the traffic data of the original network should be collected and input into the NASTAR in advance). To discover problem in time and prevent the traffic fluctuation from reducing analysis deviation, you are recommended to use the all-day KPIs (24 hours). And you should pay special attention to the traffic volume, call drop rate, and handover success rate. If there is abnormal case, analyze and handle it immediately. At last, you need to export a KPI monitoring daily report.
III. KPI Analysis (Packet Service) The daily GPRS network monitoring is responsible for the monitoring of data throughput, transmission performance, accessibility, resource utilization rate, and retain ability. The following table lists the GPRS KPIs. Data Throughput
Downlink NS_PDU mean throughput (kbps) Uplink RLC data block retransmission rate (%)
Transmission
Downlink RLC data block retransmission rate (%)
performance
Uplink EGPRS RLC data block retransmission rate (%) Downlink EGPRS RLC data block retransmission rate (%) Uplink assignment success rate Downlink assignment success rate Mean interval for packet access request initiated on CCCH (s)
Accessibility
Uplink TBF congestion rate (%) Downlink TBF congestion rate (%) Uplink EGPRS TBF congestion rate (%) Downlink EGRPS TBF congestion rate (%) Uplink PDTCH/PACCH utilization rate Downlink PDTCH/PACCH utilization rate PDCH utilization rate
Resource utilization rate
Success rate for BSC to reclaim overload dynamic PDCH PDCH allocation success rate Mean downlink throughput per PDCH (kbps) Mean uplink throughput per PDCH (kbps)
Retain ability
Uplink GPRS TBD call drop rate (%) Downlink GPRS TBF call drop rate (%) Uplink EGPRS TBF call drop rate (%)
2016-07-05
HUAWEI Confidential
Page 87 of 112
GSM BSS Swap Guide
For internal use only
Downlink EGPRS TBF call drop rate (%) For details, refer to GPRS Traffic Statistics Analysis Guide.
7.2.2 Analysis of NSS-Related Radio Indicators I. Paging Success Rate and Location Update Success Rate One-time page and subsequent pages cannot be told from each other according to the Abis interface circuit pages measured by BSC, so you are suggested to obtain the one-time paging success rate from the MSC. If the paging success rate is low, you need to check the location update success rate measured by the MSC and perform further analysis.
II. Signaling Load When analyzing the A-interface signaling load measured by the BSC, you need to check the signaling load measured by MSC. If the load is heavy, you should discuss with the customer on whether to expand the signaling link.
III. Intra-MSC Handover Success Rate If the inter-BSC handover success rate is low, you need to check the intra-MSC handover success rate or inter-MSC handover success rate.
7.2.3 Analysis of Area DT and CQT and Related Suggestions The optimized DT lines include but are not limited to the DT lines evaluated before swap. For the convenience of comparison, you are suggested to use the same DT line, test instrument, and vehicles for drive test. Note that the position of MS antenna and that of the vehicle mounted station must keep consistent before and after the swap. In addition, the test should be performed at the same time in a day. You should perform corresponding optimization according to the drive test, and then compare the final DT results with the predicted results. Finally, you should output a network comparison report. CQT should be performed for VIP areas and the network quality in the VIP areas must become better after swap. After CQT, you need to further optimize the network.
7.2.4 After-Swap Network Maintenance NASTAR, GSM network optimization software developed by Huawei, can be used to monitor the daily network performance (it can output daily report, weekly report, half-monthly report, and monthly report). In addition, NASTAR can also be used for frequency analysis, adjacent cell analysis, performance analysis, and geographic location display. A specialist should be arranged to update the data for NASTAR according to the change of the network, and the specialist should check the data with the customer periodically.
2016-07-05
HUAWEI Confidential
Page 88 of 112
GSM BSS Swap Guide
For internal use only
Traffic data should be sent back to the performance service platform of the regional division for analysis and handling. For details, see NASTAR Operation Guide.
7.2.5 Network Optimization The following tasks are involved in network optimization:
Adjust and optimize BTS coverage area
Adjust and optimize the interference between adjacent cells or frequencies.
Set and adjust adjacent cell relationship
1)
Adjust and optimize handover parameters
Prepare dialing test for the cells in which frequency hopping is available
2)
Register traffic tasks, monitor and optimize network performance after swap, and check the change of KPIs.
7.3 Customer Communication When analyzing and handling network problems, you need to communicate with customers in time, seek help from them, and notify the results to them in time.
Chapter 8 Swap Acceptance and Document Transformation Swap acceptance is based on equipment acceptance. Generally, rough acceptance solution should be decided in the communication with the customer at the early stage. Swap acceptance includes preliminary acceptance and network performance acceptance and should be implemented following the contract strictly.
8.1 Preliminary Acceptance After the equipment has been running normally for a period of time, you can apply for preliminary acceptance. The project supervisor can cooperate with the customer’s engineers to test some indicators during installation and commissioning. And the test data can be used for the preliminary acceptance if it is acknowledged by the customer. The project supervisor and the customer should perform the preliminary acceptance together. If necessary, the customer relationship manager, service manager, and project manager can be invited to join the acceptance. The customer’s signature is required for each test item included in the preliminary test. 2016-07-05
HUAWEI Confidential
Page 89 of 112
GSM BSS Swap Guide
For internal use only
For the problems which have not been solved yet, you should communicate with the product manager of the corresponding representative office on them. And the problems cannot be recorded in the acceptance report. Instead, they should be0020recorded in the project memo. On the completion of the preliminary test, the customer should leave signature and seal on the project completion acceptance certificate and system preliminary acceptance certificate.
8.2 Network Performance Acceptance After the network is monitored for a period of time and all online problems are solved, you can perform network performance acceptance together with the customer. Network optimization acceptance is divided into traffic statistical acceptance and drive test acceptance. Before the test, you should collect and evaluate network information in advance and make rational acceptance standard based on the evaluation. If the network to be accepted is large, you can divide the network into several smaller areas and preformed the acceptance accordingly. For details, refer to RPO202-04 Network Optimization Acceptance Standard and Method (G).
8.3 Document Transformation On the completion of whole swap acceptance, you should transform the documents for engineering, acceptance, and maintenance to the customer.
Chapter 9 Swap Risk Analysis GSM network swap is a complex and systematic project, because the duration is long, many products are involved, and the project scale is large. Therefore, any irrational plan and improper operation will cause unexpected results. To control risks, this chapter introduces the methods to predict and evaluate the risks. From the perspective of customers, they care about the duration most. From the perspective of Huawei, however, besides the duration, it also cares about engineering quality and cost. According to the current experience, there are following risks:
The network indicators fail to reach the standard specified in the contract after swap.
The coverage area decreases after swap.
Network integration fails due to unavailability of transmission.
Duration delay is caused by inefficient communication.
2016-07-05
HUAWEI Confidential
Page 90 of 112
GSM BSS Swap Guide
For internal use only
9.1 Network Information Collection and Risk Evaluation 9.1.1 Risks Caused by Inadequate Understanding of the Performance of the Original Equipment [Risk description] The risks are caused by inadequate understanding of the performance of the original equipment. [Solution] You should gain a full understanding of the network before swap. If there is coverage problem, you should test power first or communicate with the customer and marketing department on whether to swap the network.
9.1.2 Risks Caused by Inaccurate Information [Risk description] The project parameters and network parameters provided by the customer may be inaccurate. As a result, risks may happen during project implementation. [Solution] Before swapping the network, you should check and evaluate if the information is valid.
9.1.3 Case Study I. Case 1: Indoor Coverage Configuration Problem An operator uses macro cell and distribution antenna system for indoor coverage. The distribution antenna system has no diversity receive antenna and is connected to the BTS with one feeder. However, double CDUs are used according to Huawei BSS configuration, so two feeders must be configured. Therefore, Huawei equipment cannot be connected to the distribution antenna system of the old network. To solve the problem, engineers have to change the contract configuration. In this case, SCU and CDU are used.
II. Case 2: Customer Complained that the Coverage Area Became Smaller after Huawei Used BTS3002C to Replace Company N’s Outdoor BTS According to on-site engineers’ analysis, company N’s outdoor BTS was small in size, which looked like small BTS. Therefore, the project supervisor took it for another BTS whose power was 10W. According to later measurement, the actual power of the BTS was 34W, but the power of the Huawei BTS3002C was 20W.
III. Case 3: Repeaters Caused High Call Drop Rate After Swap According to traffic statistics, the call drop rate was high for the cells covering the countryside. It is found that these cells have repeaters. All the repeaters were wireless, some of which were broadband repeaters, and some of which were frequency selective repeaters. The information related to the repeaters was not fully collected before swap, so the adjacent cell relationship 2016-07-05
HUAWEI Confidential
Page 91 of 112
GSM BSS Swap Guide
For internal use only
between the repeaters and neighboring cells was improperly designed. As a result, high call drop rate occurred. Especially because of the capacity expansion or frequency change after swap, the calls controlled by frequency selective repeaters will certainly drop. In the following case, the call drop rate will also rise. If a call hands over from a repeater cell to a neighbor cell under the control of the same BTS, the path difference of the source cell and target cell is great. In this case, if the repeater cell is set to synchronization handover cell, the TA value cannot be adjusted after handover. As a result, call drop will easily occur. To solve the problem, you need to change the repeater cell to asynchronous handover cell.
IV. Case 4: Coverage Area Became Smaller Due to Lacking Understanding of the Movable BTS Used in the Original Network The customer complained that the call quality at a road section was poor after network swap. According to field survey, it is found that no strong cell was present within this section and the interference between signals was serious. The call quality was still unsatisfactory even through adjusting the antennas and frequencies of the surrounding cells. According to further analysis, the reason was that a movable BTS was used for the coverage of this section. At last, Huawei closed the movable BTS and installed a new BTS for this section. And the problem was successfully solved.
V. Case 5: Frequent Intermittence Occurred After Company N’s BTS was Replaced by Huawei BTS3006A Huawei BTS3006A is configured with 5 PSU power supply modules and the capacity of the standby battery is 650AH/24V. In addition, 6750W of DC power and 7500W of AC power are available for BTS3006A. However, in that area the power supply cable was made of aluminum. In addition, the cable was long and the loop impedance was great. Especially great power was needed when the battery was in charge. In this case, the power supply system may not be normally started. Since the difference between the transmit power, battery capacity, and power supply module of the old equipment and that of the new equipment was great, the AC input power of the original equipment was required to be lower than that of the BTS3006A. To solve the problem, engineers reduced the AC power requirement of BTS3006A through changing the charging current of the power supply module and battery. After that, BTS3006A ran normally. If you meet problems of this kind later, you should check the power supply network and communicate with the marketing engineers on the power supply requirement of Huawei equipment.
VI. Case 6: Information of the Original Network was Not Fully Collected and Analyzed [Problem] It was found that the A-interface circuit is inadequate when Huawei BTS was used for a swap project, which prolonged the project duration. To ease the traffic pressure, the related engineers expanded the capacity of the A-interface. 2016-07-05
HUAWEI Confidential
Page 92 of 112
GSM BSS Swap Guide
For internal use only
[Reason analysis] The traffic models of the original network were not fully collected and the predict traffic volume was inconsistent with the actual traffic volume. As a result, the capacity of the A-interface circuit was inaccurately estimated, and thus the project duration was prolonged. Therefore, the customer began to doubt Huawei engineers’ capability. [Reflection] The traffic information of the original network should be fully collected before swap and provide the solutions of A-interface expansion to the customer in advance. Though it is GBSS swap, but the information related to NSS, especially the information related to MSC should be noted and monitored.
VII. Case 7: The Longtitude and Latitude of the BTS were Not Fully Checked In a network swap project, engineers failed to check the longitude and latitude of the BTS fully. After the completion of the project, it is found that the several BTSs were locating in the areas covered by other BSCs. Therefore, the network structure was irrational. After that, the engineers had to perform rehoming operation.
VIII. Case 8: The Mark of A-interface Was Not Verified In an area, the customer found that the mark of the A-interface provided in the interconnection parameter table is Phase 2, but it was Phase 2+ after network integration. If engineers do not change the mark immediately, many problems will occur.
9.2 Project Survey, Equipment Installation and Commissioning 9.2.1 Interconnection Risks [Risk description] If the MSC of the original network is not provided by Huawei during GBSS swap, engineers may find it hard to perform IOT test. In addition, if the customer conditions are not met or the customer does not cooperate with the swap project, the engineering duration will be delayed. [Solution]
Invite related customer relationship manager, service manager, marketing personnel, and PM to persuade the customer to cooperate with the swap project actively.
Check the environment of the engineering field in advance to ensure that the equipment installation and commissioning can be finished within the schedule.
Seek help from technical support engineers.
9.2.2 Problems Related to Interconnection of GBSS and G9 The following table lists the similar problems.
No.
Problem Description
2016-07-05
Solution
HUAWEI Confidential
Page 93 of 112
GSM BSS Swap Guide
1
Clock
2
problem
For internal use only
caused
by
G9
BTS clock is installed outside of the UMG
integration
and IP should not be used for clock
Decrease of CSSR (call setup success
transmission. Enhance A-interface utilization rate through
rate) caused by G9 integration.
late assignment.
9.2.3 Risks Concerning BTS Survey [Risk description] In some cases, the antennas of the original network can be reused, but the antenna connector does not necessarily match the transmission connector, or the capacity of the power supply cannot meet requirement. If the previous information is not fully checked before the launch of the project, the project duration will be delayed. [Solution] You should confirm the swap project with the customer in detail. If necessary, you should survey some of the BTSs. If there is any problem, you need to communicate the problem with the customer and solve the problem immediately.
9.2.4 Quality Risks Caused by Project Installation Team’s Engineering Level [Risk description] At present, many project teams are green hands. They may pursue progress while neglect the engineering quality. And this problem is commonly seen in overseas projects. [Solutions]
Product manager should have serious quality consciousness.
Experienced project teams are preferred.
The corresponding representative office should exert strict management on the partner.
Perform strict quality management.
Take measures to solve problems quickly and exert penalty on the responsible party if necessary.
On-site project supervisor should perform careful self-check after engineers finish installing the hardware and before the equipment is enabled, especially the set-top power and TRX power must meet requirement and the cell direction must be correct.
In overseas, corresponding trainings must be provided to the local project team. The trainings should cover operation rules and flows. And the project supervisor is responsible for guide the project team to install the project according to rules and flows.
The project team should sample some BTSs for quality check.
The corresponding regional division and representative office should routine check the engineering quality.
2016-07-05
HUAWEI Confidential
Page 94 of 112
GSM BSS Swap Guide
For internal use only
Trainings should be provided to the project teams whose techniques have much to be improved.
The project supervisor should cooperate with the project manager to monitor the network quality and supervise the project team to follow swap procedures.
9.2.5 Version Risk [Risk description] With the evolution of GSM network, many new functions are used, such as half rate and AMR. If engineers do not understand the functions of the original network or the functions provided in the contract, the project delivery date may be delayed, and this is especially true at the NSS side. [Solution] The on-site project team should check the functions provided in the contract strictly and communicate with the customer to understand the functions of the original network. In addition, the features of the current version should also be thoroughly understood.
If the version is available, you can confirm the features of the version from the related technical owner or the technical support department.
If the version is not provided, you can confirm the features of the version from the product manager, marketing (CCM) and the general office of the regional division.
The confirmation of functions and needs should be fulfilled in the electronic process of the requirement and commitment, and each electronic process should be monitored.
The information of the version is inconsistent with the version; you should reach an agreement with the front marketing and R&D departments.
The plans provided in the version should be listed into the general project plan.
9.2.6 Case Study I. Case 1: BTS Could Not Run Normally Due to GSM/CDMA Common Transmission There was alarm generated for a cell of a BTS after network swap and the BTS could not work normally. However, it could work normally after changeback. According to field survey, engineers found that this BTS was used for both GSM transmission and CDMA transmission. The network was expanded after the swap, and thus the transmission resources are inadequate. Therefore, the BTS could not run normally.
II. Case 2: BTS Clock Synchronization Problem Cause by GSM/CDMA Common Transmission The clock of the GSM BTS could not synchronize the upper level clock when GSM BTS and CDMA BTS shared common transmission. The transmission of a swap BTS passed through CDMA BTS first, and then the timeslot integration equipment extract the transmission. However,
2016-07-05
HUAWEI Confidential
Page 95 of 112
GSM BSS Swap Guide
For internal use only
because the synchronization timeslots were not provided, the clock of the GSM BTS could not synchronize the upper level clock. As a result, the BTS could not work normally after swap.
III. Case 3: Inadequate Capacity of Reused Battery Delayed BTS Installation Progess In a swap project, the power supply equipment of the original network was reused in the new network. In addition, the capacity of the BTS was also expanded in the new network. After installation, however, engineers found that the power supply equipment provided by the customer could not meet requirement. And it cost some time for engineers to buy new power supply equipment. Therefore, the BTS installation progress was greatly delayed.
IV. Case 4: BTS Integration Date Was Delayed Because of the Transmission Connector Used in the Original Network Mismatched That Used by Huawei In a swap project, engineers found that the transmission connector used in the original network mismatched that used by Huawei. Therefore, on-site engineers must remake the E1 line, but no SMB connector was available then. In this case, the BTS integration date was delayed.
V. Case 5: BTS Installation Schedule Was Delayed Due to Goods Distribution Problem According to plans of swap project, the project installation should be performed immediately after customs clearance, but the distance between sites was large, so the transportation period was long. Therefore, the goods could not be distributed to each site in time. As a result, multiple BTSs were integrated twice, which delayed the network swap progress. Meeting this kind of problem, the customer made many complaints. If you meet similar situation later, you should make proper arrangement in advance.
VI. Case 6: CIC Mistake Caused by Confusion of Transmission Labels Engineers found that there were many CIC mistakes present at the A-interface after BSC installation. Through analysis, engineers found that the transmission labels were totally in a mess. Therefore, when installing cable, you should pay attention to both the quality and correctness of the project installation.
VII. Case 7: Engineering Quality Resulted in Customer Complaints The customer complained that the coverage area of the network became smaller after a BTS was swapped. Through careful analysis, engineers found that the problem was related to the 1/2 jumper locating between the set top and lightening protector. As far as this swap was concerned, most of the antennas used in the old network were used in the new network. However, the standing wave of the 1/2 jumper was not tested. Therefore, if you meet similar problem in the future, you need to test the standing wave ratio of the 1/2 jumper. If necessary, you can design a work flow to ensure the operation.
VIII. Case 8: M2000 Was Not Installed in Time In a swap project, the installation conditions for M2000 installation were not met, so it was very hard for engineers to monitor the BTS performance and locate problems. In this case, you should communicate with the customer on how to create mature conditions for M2000 installation. 2016-07-05
HUAWEI Confidential
Page 96 of 112
GSM BSS Swap Guide
For internal use only
IX. Case 9: BTS Integration Date Was Delayed Because of the Connector of the Jumper to Be Used Was Different from the One Provided by Huawei In a swap project, the connector of the jumper to be used was different from the one provided by Huawei, so it cannot be connected to the lightening protector of Huawei. Therefore, on-site engineers must remake the connector, but no auxiliary equipment was available then, so the integration date was delayed. If you meet similar situations in the future, you need to confirm if the connector is available before in advance.
9.3 Network Planning and Optimization Risk 9.3.1 Risk Related to Network Indicators It is a common problem that the network indicators may become worse after BTS swap. [Risk description] The network quality may become worse after the swap of the local network from the perspective of the following four aspects:
The network quality is really poor.
The customer thinks that the network quality is poor.
The customer thinks that the network should be optimized when faced with the pressure from the indicator requirement.
Other equipment problems make the network quality worse.
[Solution] Before swapping the network, you should collect the necessary data and test the network in advance together with the customer. In addition, you should perform comparison test after swap. Furthermore, you should optimize the network if necessary. To make the comparison more effective, you can obtain the important indicators of original network from the customer one month before the swap. If the antennas of the original network need to be reused, you should test the standing wave ratio of the antennas before swap. In addition, you should also pay attention to the operation of other related equipment, such as MSC. Meanwhile, you should guide the customer to believe in the equipment provided by Huawei and pursued the customer to accept that the problem can be solved through network optimization.
9.3.2 Coverage Risk It is the greatest risk that may happen during network swap. [Risk description] The coverage area of the network may become smaller after network swap, especially the coverage area of the BTSs in suburban areas, countryside, and roads may become much smaller. [Solution] 2016-07-05
HUAWEI Confidential
Page 97 of 112
GSM BSS Swap Guide
For internal use only
You must record the set-top power of the original BTS and configure the Huawei BTS accordingly. If the set-top power of the Huawei BTS is lower than that of the original BTS, you can apply two EDUs, two CDUs, and 60WTRX to the downlink, and apply tower mounted amplifier to the uplink. If receiving customer complaints, you can compare the set-top power before and after network swap, and then locate the problem.
9.3.3 Inadequate Test before Swap The network integration acceptance test may be affected if the test is inadequate before swap. To avoid the risk, you should fully understand the coverage and performance of the original network and design applicable network swap plan according to basic data.
9.3.4 Frequency Planning Risk If the frequency planning is irrational or the frequencies are inadequate in the original network, you should adopt new methods to plan the frequencies in the new network; otherwise the frequency planning will turn out to be a difficult task. In this case, you should communicate with the customer if new frequencies are to be added to the new network. If new frequencies are not required, you should lower the customer’s expectation towards the network quality during the network swap. Note that the parameters of the original network should be used for the swap. Meanwhile, TRX capacity can be expanded and new sites can be established along with the network swap. On the completion of the swap, you can plan the frequencies for the overall network.
9.3.5 Risk Related to Traffic Volume The traffic volume may become lower after swap, and the reasons are as follows:
The BTS set-top power becomes lower.
The antenna performance becomes worse.
Parameters are irrationally set.
The subscriber number changes.
The methods measuring the traffic volume vary with operators.
9.3.6 Case Study I. Case 1: BSC Traffic Volume Decreased Sharply After the Swap of Operator A’s BSS System The reason of this problem was that operator A and Huawei used different methods to measure BSC traffic volume. In fact, the traffic volume measured at MSC was higher after swap.
II. Case 2: Problems Caused by Imcomplete Parameter Collection [Risk Description] 2016-07-05
HUAWEI Confidential
Page 98 of 112
GSM BSS Swap Guide
For internal use only
The coverage area became smaller after operator N’s large-configuration BTS was replaced by Huawei equipment in an urban area. In addition, the signals fluctuated greatly after swap. [Reason Analysis] The information the original equipment, such as BTS configuration, combiner mode, and antenna number, were incompletely colleted before swap. After swap, the customer complained that the combiner loss of Huawei equipment was greater than that of the original equipment, but the settop power of Huawei equipment was lower than that of the original equipment. Based on negotiation with the customer, engineers strengthen the coverage through adding antennas and PBU to the network and changing the BTS type. [Reflection] All the parameters of the original network must be colleted before network swap.
III. Case 3: Frequency Interference Was Generated Because of the Coverage Area of a BTS Was Enlarged After Swap. The reason was that engineers failed to have an overall understanding of the original network. Huawei 80W BTS was used to replace the operator N’s 40W BTS, but the frequencies of the original network was still used in the new network, so frequency interference was generated.
IV. Case 4: Paging Success Rate Was Low Because of the Configuration Parameters of the Original Network Were Imcompletely Collected The one-time paging success rate became lower after network swap. Through careful test and analysis, engineers found that the operator N’s BTS did not control RACH minimum access level but supported paging retransmission, so the one-time paging success rate was low. Therefore, the information of the original network should be fully understood and analyzed. To solve the previous problem, engineers can set the RACH minimum access level to 0-1.
V. Case 5: Problem Related to CRO Setting The network ran normally after integration, but the customer complained that it was difficult to make calls suddenly. Through careful analysis, engineers found that the CRO was set to 0. To solve the problem, engineers integrated the BTS to another BSC and set the CRO to the default value.
VI. Case 6: Call Drop Rate Became Higher After Swap The call drop rate was doubled after network swap in an area. Test found that the original equipment provider used different standard to measure call drop rate.
9.4 BSS Integration and Monitoring Risk 9.4.1 Risk Relate to BSS Integration Solution [Risk description]
2016-07-05
HUAWEI Confidential
Page 99 of 112
GSM BSS Swap Guide
For internal use only
A swap project was characterized by short duration, large service volume, and complex networking, so engineers found it hard to write down the integration solution, which may cause potential risk. [Solution]
The integration solutions must be written down.
All aspects concerned should considered into the integration solutions.
The integration solutions should be detailed enough.
The integration solutions should be reviewed.
Customers are required to participate into the solution design.
The solutions should be prepared in advance.
9.4.2 Risk Related to BTS Pre-integration [Risk description] If the pre-integration is not performed, potential risk may occur, because Huawei equipment and the MSC of the original network cannot necessarily cooperate with each other well. [Solution] Both network pre-integration and network integration are key points for network swap, so the network pre-integration cannot be omitted. If the network pre-integration is perfectly done, customers will be more confident in Huawei’s engineering capability.
9.4.3 Risk Related to Transmission Commissioning The transmission commissioning is one of the keys to the success of network integration. [Risk description] In some cases, the transmission commissioning workload is heavy at the integration night. The integration progress will be affected if the transmission commissioning speed is low. [Solution] Hereunder lists the technical-based solutions:
Test the trunk with E1 card to ensure that the trunks are correctly connected. If necessary, you can confirm the transmission and CIC for each line and paste label on each line.
Block half of the trunks before integration and unlock them after integration.
Paste labels on the trunks needing intermediate connection.
Simulate and practice pre-integration.
Connect the lines with transmission to avoid signaling congestion.
Arrange a specialist to check the previous operations.
Hereunder lists the non-technical solutions:
Notify related affairs to the customer in advance
Plan the integration progress according to customer’s transmission adjustment capability. 2016-07-05
HUAWEI Confidential
Page 100 of 112
GSM BSS Swap Guide
For internal use only
Apply for more time for transmission commissioning and integration from the customer.
Participate into each responsibility matrix actively.
9.4.4 Risk Related to BTS Integration [Risk description] BTS integration is a complex task, and any improper operation will result in integration failure. [Solution] Hereunder lists the solutions:
Integrate the BTSs by batch and fully consider the BTS location and adjacent cell relationship.
Discuss the integration solutions with related parties fully and organize the exports for the HQ of Huawei to review the solutions.
Set up a coordination team.
Make sure each BTS is debugged before integration.
Find the responsible person for each component and arrange a specialist to check if all the components are available.
Check all the tables needed for the integration, such as BTS project parameter table, BTS antenna jumper description table, integration time table, etc.
Set up emergency team.
Make related data and simulate the integration.
Create a channel through which engineers can communicate with the customer freely.
Strengthen the project management capability.
Paste labels on the jumpers of the original BTS.
Analyze BSS KPIs and core network KPIs during integration.
Test the dialing test function.
Organize experts from the HQ of Huawei to support the integration and ensure free communication between experts and on-site engineers.
Optimize and adjust network parameters to ensure network quality.
The parameters of the original network and that of the new network should be consistent with each other.
9.4.5 Emergency Problems Related to BSC Integration [Risk description] Generally, BSC integration should be finished in advance. If emergency problems occur at the integration night, the whole BSC integration will fail. [Solution] You can test the BSC in detail beforehand. If emergency problem occur, you can seek help from technical support engineers to locate the problem as soon as possible. For further analysis, BSC 2016-07-05
HUAWEI Confidential
Page 101 of 112
GSM BSS Swap Guide
For internal use only
supervisor should monitor and save the data such as interface messages and BTS log. If the problem cannot be solved in time, you should change the data back to recover normal communication. For details, see BSC Emergency Guide.
9.4.6 Handling of Abnormal Conditions during BTS Integration I. BTS One-time Integration The BTSs under the control of the same BSC can be integrated into the new network in one time. To achieve this goal, engineers should design rigid plans. The VIP sites covering indoor environment and remote areas should be integrated during day time, and the sites covering urban areas should be integrated at about 00:00.
II. Antenna Problem Happened During BTS Swap Generally, the antenna system of the original network can be reused, so you should test the standing wave ratio of the old antennas to see if there is any problem. If the old antennas cannot be reused, you should handle the problem immediately. If the antennas are inversely connected, you need to correct the connection in time. If the standing wave ratio of the antennas is great, you can consider remake the connector or change the feeder.
III. Repeater Reutilization Problem If a repeater is attached to the BTS to be swapped, the repeater can be reused after swap. If the frequency of this BTS needs not to be changed, you do not have to adjust the repeater either. If the frequency of the BTS changes, you should modify the frequency parameters of the repeater.
IV. Indoor Distribution System Problem Generally, the indoor distribution system can be reused. After the replacing the original BTS, Huawei BTS is responsible for providing the signals for the indoor distribution system. Note that the related transmission and antenna connectors are available.
V. VSWR Alarm Handling The standby connectors must be available at the swap night. In addition, you should notify the movable team to use instrument to test if the VSWR alarm is true.
VI. Inverse Connection of Antenna You should install project following the project parameters and design strictly and use MS to test if the cell direction is correct. If finding that the antenna is inversely connected, you should take measures to solve this problem immediately.
VII. Abis Interface Error Both the BTS operation and Abis interface should be tested after integration. The BTS installation personnel should confirm the CGI through the local maintenance console or check if the CGI is correct through test MS.
2016-07-05
HUAWEI Confidential
Page 102 of 112
GSM BSS Swap Guide
For internal use only
9.4.7 Case Study I. Case 1: Monitoring Traffic Statistics After Integration Prevented Problems from Spreading [Problem] On the next day after network swap, engineers found that there was traffic volume in a cell, but no call was present. [Reason analysis] Through checking channels, engineers found that the SDCCHs were in idle state. After changing TRX, engineers found that the cell worked normally. Therefore, you should closely monitor the important traffic statistics of the site after swap the next after swap to prevent the potential problems from spreading.
II. Case 2: The Speed for the MS to Access the Network Was Slow Due to Clock Problem Engineers found that the speed for the MS to access the network was slow in a site. First engineers thought that the problem was present at the BSC. Through further analysis, engineers found that UMG and Msoft3000 were located in different places, but the network was organized according to IP. Therefore, the UMG could not obtain precise clock from IP transmission, which resulted in BSC problem. As a result, the speed for the MS to access the network was slow.
9.5 Acceptance Risks 9.5.1 Risk Related to Customer Communication [Risk description] The acceptance items were not specified in the contract in detail. Because the engineers did not communicate with the customer fully in advance, the acceptance speed was slow, so the date for the equipment to access the network was delayed. [Solution] If the acceptance items were clarified in the contract, engineers should perform the acceptance following the contract strictly. If some acceptance items were not specified in the contract, engineers should communicate with the customer and obtain the customer’s written confirmation.
9.5.2 Risk Related to Acceptance Test before Integration [Risk description] The customer will perform acceptance test before integration. According to past experience, engineers download the related acceptance manuals from http://support.huawei.com for the customer, and the customer performs the test with the help of the manuals. However, the manual update rate is relatively slow. Therefore, if the customer performs the acceptance test following the manuals strictly, many test items will be unqualified. 2016-07-05
HUAWEI Confidential
Page 103 of 112
GSM BSS Swap Guide
For internal use only
[Solution] Engineers should read the acceptance manuals beforehand and make corresponding correction. In addition, engineers should accompany the customer with the acceptance test. If any problem is found engineers should feed it back to the related personnel and correct the acceptance manuals accordingly.
9.5.3 Case Study I. Case 1: Acceptance Test Could Not be Performed Because the Acceptance Standards Were Not Designed in Detail The acceptance standards were not detailed in the contract, so the customer always created difficulties for the engineers during the test. In fact, there were a number of similar cases. To solve the problem, engineers should detail the acceptance standards in the contract and communicate with the customer as early as possible.
II. Acceptance Progress Was Slow Because the Distance between BTSs Was Large In an area, the distance between BTSs was large, so it cost test engineers’ lot of time on road. In this case, the acceptance progress was affected. To solve the problem, engineer should perform the acceptance test at the network optimization stage with the company of the customer.
9.6 Non-technical Risk Analysis 9.6.1 Risk Related to Contract Items At present, many contracts are not made scientifically. For example, the contract configuration is incorrect, the KPI commitment is irrational, the engineering duration is too short, the acceptance items are vague, and the service price was low. To control the contract effectively, pre-sales department should participate into the contract review. At the pre-sales stage, you should fully communicate with the marketing staff and organize all the personnel concerned to review and clarify the contract. After the contract is signed, you should evaluate the contract and find out solutions to potential problems. Some customers may require changing the contract. In this case, you cannot agree with or refuse the customer directly. Instead, you should consult the related marketing personnel first.
9.6.2 Risk Related to Project Duration Risk [Risk description] Generally, the project duration is short, which may generate potential problem. [Solution] 2016-07-05
HUAWEI Confidential
Page 104 of 112
GSM BSS Swap Guide
For internal use only
Prepare the related resources in advance.
Make a detailed plan
Spend some of your spare time on the work if necessary.
Implement task parallel.
Seek help from others
9.6.3 Management Risk [Risk description] Generally, a swap project involves multiple roles, including PM, Huawei BSC engineers, RNP engineers, partners, RNO partners, customers, technical support experts, representative offices, project supervisor, and other equipment providers. Therefore, how to manage these roles effectively is problem. [Solution] Hereunder lists four solutions. 1)
Cooperation between network planning and project
Huawei should adapt its networking planning solutions to the local network. The network adjustment suggestions provided by the RNO teams should be put into practice after confirmed by both the customer’s RNO owner and Huawei RNO owner. If you need the customer’s cooperation or modify parameters in MSC, you should prepare corresponding application document. If the customer or BSS engineers are responsible for the adjustment, you should require them to feed back the adjustment results. RNO engineers are not allowed to change the BTS configuration by their own, and RNP engineers are not allowed to change the RNO parameters by their own. Therefore, the responsibility matrix of the RNO team and RNP team should be clearly defined. The project team should notify the problem handling progress to the RNO team. 2)
Subcontractor Management
Have an understanding of each subcontractor’s engineering capability before beginning the network. Generally, you should know the experiences, knowledge, team number, vehicles, and basic instrument owned by the subcontractor.
Set up project report and monitoring system.
Pay more attention to manage teams whose engineering capability is relatively poor.
Keep a good relationship with the engineering team.
Convey responsibility to each person in the contract.
Set up a unified database and report template if multiple subcontractors are responsible for the project.
3)
Customer cooperation
Full communication with the customer must be implemented. If necessary, you should prepare written document for customer cooperation. 4)
Supervisor management
2016-07-05
HUAWEI Confidential
Page 105 of 112
GSM BSS Swap Guide
For internal use only
Supervisor connects the customer to Huawei, so you should fully communicate with the supervisor. In some cases, the supervisor can help you manage the engineering team. Therefore, supervisor management should be properly and strictly implemented.
9.6.4 Risk Related to Communication [Risk description] If the communication is not smooth and the responsibility matrix is not divided clearly, unnecessary conflicts will occur and project duration may be prolonged. [Solution] The project manager plays a very important role in the project, so a project manager should have both network planning skill and communication skill. The communication system should be perfectly established. For example, weekly report and daily report should be submitted to the customer’s manager.
Within the project team, daily report and weekly report system should be implemented. In addition, the members of the project team should fix a period of time to communicate with each other in a week. The daily report includes project progress, difficulty, and support needed. The weekly report also includes the project progress in terms of a week, difficulty, support needed, next week’s plan, etc.
Communicate with the related leaders of the representative office on the project. If there is emergent problem, you should communicate with the leaders immediately.
Communicate with the customer through meetings, weekly report, and summary report. The customer is expected to know the progress, difficulty, and future plans related to the project. Note that the engineers responsible for customer communication should be fixed and the communication with the customer’s senior management team should be emphasized.
Feed back the field conditions to Huawei according to working flows. If necessary, you can organize the related departments and engineers to have meetings to solve serious problems together.
9.6.5 Risk Related to Contract Implementation [Risk description] According to some contracts, the antennas, transmission, and power supply should be swapped together with the equipment, but the customer may require that the equipment should be installed at the position where the original cabinet located. In this case, it will be difficult for block integration, which will prolong the integration time and affect network indicators; especially the handover will be seriously affected. Sometimes MSC A-interface will not be expanded, so BTS integration always carries A-interface integration. If the BSC is frequently adjusted, the stability and quality of the network will be affected.
2016-07-05
HUAWEI Confidential
Page 106 of 112
GSM BSS Swap Guide
For internal use only
[Solution] You are suggested to communicate with the customer on the detailed integration solution to win the customer’s agreement. In addition, you ensure that the manpower, project supervisor, and engineering team are available in advance. You are not suggested to assign multiple BTSs for a project team.
9.6.6 Risk Related to Work Flow [Risk description] If the project team do not follow the swap procedures made by Huawei but follow their own manner to implement the project, great potential problems may be generated. [Solution]
Engineers should be familiar with the work flow and follow the flow strictly.
New comers should learn from experienced engineers.
Self-reflection is encouraged.
Feed back the customer’s extra requirement to the related party and any self-reply is forbidden.
9.6.7 Case Study I. Case 1: Customer’s Senior Management Team Sent Complaints to Huawei Marketing Department Because Engineers Did Not Report the Problem Handling Result in Time [Problem description] Customers’ senior management departments complained about echo problem to bidding department directly. [Reason Analysis] Engineers from cooperation partners were in charge of the echo problems, but they did not notify the processing progress to customers, so customers thought that the project was not paid enough attention to. Considering the seriousness of the complaint, representative offices established a special group to solve the problem. After four weeks’ effort, engineers found that circuit from the local exchange to the site A had been adjusted recently and there were two E1 Loop backs. That is why the echo problem occurred. In addition, Huawei engineers reported the processing progress to customer’ senior management departments every week. After the problem was solved, Huawei engineers submitted a formal report to customers. After that, customer’s doubt towards Huawei gradually changes. [Reflection] Problems should be solved in time and real-time communication with customers should be emphasized.
2016-07-05
HUAWEI Confidential
Page 107 of 112
GSM BSS Swap Guide
For internal use only
II. Case 2: Customer Complained About the Document Problem In a swap project, engineers failed to consider customer’s cooperation needs. The document submitted to the customer was modified for several times, which was greatly to the unsatisfactory of the customer.
III. Case 3: Important Cooperation Affairs Should be Confirmed by the Customer’s Senior Management Team at the Project Coordination Meeting The customer’s engineers promised Huawei that they could perform secondary shipment by their own, but the vice president refused it, which delay the duration and increased cost. The project coordination meeting is rather important to Huawei, so you should invite the customer’s senior manager to participate into the meeting. The cooperation affairs should be submitted to representative offices for review.
IV. Case 4: Shortage of Project Duration Made the Swap Plan in a Mess. The customer required a swap to be finished in a shorter time than planned, which made the swap plan in a mess. As a result, the network quality was greatly affected and customers always complained about network problems. To solve the problems, Huawei explained the reasons to customers and guides them to accept the planned swap strategies. Results proved that the planned strategies were applicable.
V. Case 5: Hastened Progress Caused Secondary Integration In a swap project, multiple BTSs could not connect to the planned BSC directly due to various reasons, such as hastened progress, limit of transmission progress, and low speed of BSC establishment. As a result, the network structure was in a mess. Therefore, the secondary integration was a must. As for the second handover, however, it both added up to the workload and brought quality risk to the network.
2016-07-05
HUAWEI Confidential
Page 108 of 112
GSM BSS Swap Guide
For internal use only
Appendix: Reference Document Catalog and Network Integration Checklist 9.7 Reference Document Catalog All the reference documents are provided in http://support.huawei.com/. You can download the one you need from the website.
9.8 Network Integration Checklist 9.8.1 BSC Service Test Note that if the test results are abnormal, you need fill in the remark in the following table. No.
Test Item
1
Basic service
Sub-item Location when
update
the
powered
Conclusion
MS
is
on
Normal
Evaluation Standard 1) Location update succeeds and MS can access network successfully.
Abnormal
or
Remark
2) The complete location update procedure
powered off.
can be seen through the window monitoring Um interface, Abis interface, and A-interface.
2
Call service
Both
calling
party
Normal
Call is successfully made and there is no
Abnormal
one-way audio, cross talking, and echo.
Call made between
Normal
Call is successfully made and there is no
MS and fixed phone
Abnormal
one-way audio, cross talking, and echo.
Extended cell call test
Normal
Call is successfully made and there is no
Abnormal
one-way audio, cross talking, and echo.
Normal
Short message can be sent, received, and
Abnormal
displayed correctly.
Normal
1) Intra-cell handover is successfully made
Abnormal
2) There is record for successful intra-cell
and called party are MSs. 3
4
5
6
Call service
Call service
Short
MS
sends
and
message
receives
service
message
Handover
Intra-cell handover
short
service
handover according to traffic statistics. 7
Handover
Overlay-to-underlay
Normal
1)
IUO handover is successfully made.
service
handover
Abnormal
2)
There is record for successful IUO handover according to traffic statistics.
2016-07-05
HUAWEI Confidential
Page 109 of 112
GSM BSS Swap Guide 8
Handover
Inter-cell
service
within BSC
For internal use only handover
Normal
1)
Inter-cell handover within BSC is successfully made.
Abnormal 2)
There is record for successful inter-cell handover within BSC according to traffic statistics.
9
Handover
Inter-BSC handover
Normal
service
1)
Inter-BSC handover is successfully made.
Abnormal 2)
There is record for successful interBSC handover according to traffic statistics.
10
Basic service
Dual band network
Normal
1)
MS can perform location update in the dual band network.
Abnormal 2)
MS can work as either calling party or called party normally.
3)
The handover between dual band is normal.
9.8.2 GPRS Dialing Test Checklist No. Test Item 1 Basic service 2
3
Basic service
Basic service
Sub-item Conclusion If the MS attach Normal
Evaluation Standard Remark Check if the service is normal through
function is normal. Abnormal If the MS PDP Normal
spot test and drive test. Check if the service is normal through
activation
spot test and drive test.
function Abnormal
is normal. If the MS
cell Normal
update is normal.
Abnormal
Check if the service is normal through spot test and drive test. Note that the tests should be performed during and
4
5
Basic service
Basic service
If the MS routing Normal
after cell update. Check if the service is normal through
area
spot test and drive test. Note that the
Basic service
2016-07-05
is Abnormal
normal.
tests should be performed during and
If the MS can enjoy Normal
after cell update. Check if the service is normal through
services
spot test and drive test.
such 6
update
normally, Abnormal as
www
service. If the MS service Normal
Record and analyze the MS service rate
rate is normal.
through PING and FTP service.
Abnormal
HUAWEI Confidential
Page 110 of 112
GSM BSS Swap Guide
For internal use only
9.8.3 A-interface Dialing Test Checklist PCM
Module
FTC
BSC
Transmis Starting
Terminat Test Results
Problem
Problem
No.
Board
DDF
sion DDF
ing CIC
Timeslot
CIC
NO.
Port No.
Port No.
CIC
1 2 3 4 5 6 7 8 9 10
Note: For each blank, if the test result is normal, mark the blank with √; and if the test result is abnormal, mark the blank with ×, and write down the abnormal timeslot and CIC number.
9.8.4 Abis Interface Dialing Test Checklist BSC Name:
Owner: Test Time: Abis Interface Dialing Test Checklist Trans
Modul e No.
BIE
BIE
Group
Port
No.
No.
Succe
BSC-
missio
DDF
n
BTS
Port
DDF
Name
No.
Port
Confi gurati on
No.
2016-07-05
Norm al
Board
Initiali
State
zation
Chann el State
ss
Chann
Locati
el
on
Dialin
Updat
g Test
e
HUAWEI Confidential
Page 111 of 112
GSM BSS Swap Guide
For internal use only
9.8.5 BTS Radio Channel Dialing Test Checklist
Site No.
Site Name
Site Type
Site
Test Result
Configurati
Problem TRX Problem No.
Remark
Timeslot No.
on
Note: The site number, site name, site type (such as BTS30), and configuration type (S3/3/3) must be recorded if they are tested. Each TRX and each timeslot of a site must be tested. If the test result is normal, mark the blank with √; and if the test result is abnormal, mark the blank with ×, and write down the abnormal timeslot and CIC number.
2016-07-05
HUAWEI Confidential
Page 112 of 112
