Nastar function
Catalogue 1
Nastar Functions Overview
2Nastar Routine optimization functions introduction 3 Nastar Terminal analysis function introduction 4Nastar Geographic analysis function introduction 5Nastar VIP complaint analysis function introduction
Network Topology • •
The Nastar is deployed on the distributed network in Client/Server mode and is connected to the network management system. ATAE servers together with the SAUs deployed on BSCs or RNCs can manage a maximum of 50,000 UMTS cells.
Function Solution
Service resource analysis
User assurance Optimization based on geographic observation
Coverage
Neighboring Cell
Frequency
…
UE analysis Routine network optimization
Overview of Nastar Functions (UMTS) Scenario
Functions
Description
Routine network optimization
Coverage analysis Neighboring cell analysis Pilot pollution analysis Uplink interference analysis Cell performance analysis
Provides MR-based analysis on network downlink coverage problems. Provides intra-RAT neighboring cell analysis and inter-RAT neighboring cell analysis. Provides MR-based frequency optimization analysis. Identifies and analyzes interfered UARFCNs and interfering sources. Analyzes exception causes and user distribution based on cells.
User assurance
VIP analysis Complaint analysis support
Manages VIP users and provides periodic performance analysis for VIP users. Quickly collects user complaint information, and provides complaint analysis support based on exceptions.
Optimization based on geographic observation
Network geographic observation
Displays service analysis results on maps.
UE analysis
Analyzes the performance of each type of terminals on the live network.
Data service analysis
Provides data service resource analysis and displays the results on maps.
UE analysis
Service resource analysis
Source Data for Nastar UMTS Analysis Themes
•
Source data analyzed by the Nastar is as follows: – Network performance data (such as MR data): used for coverage analysis, neighboring cell analysis, and pilot pollution analysis. – RTWP data: used for uplink interference analysis. – CHR data: used for complaint analysis support, VIP analysis, terminal analysis, cell performance analysis, and data service analysis. – Network performance data and CHR data: used for geographic observation and data service analysis.
Catalogue 1
Nastar Functions Overview
2
Nastar Routine optimization functions introduction • Coverage analysis • Neighbor analysis • Pilot Pollution analysis • UL interference analysis • Cell performance analysis
3 Nastar Terminal analysis function introduction 4Nastar Geographic analysis function introduction 5Nastar VIP complaint analysis function introduction
UMTS Coverage Analysis
The Nastar provides the UMTS coverage analysis function. With this function, you can analyze the measurement reports (MRs) sent by UEs to check the coverage of test cells and detect cells affected by weak coverage, coverage overlapping, and poor service quality on the live network. An MR contains the downlink RSCP, Ec/No, and propagation delay (TP) when the UE accesses a cell. After the analysis conditions are set, the Nastar starts to analyze the coverage of selected cells and displays the analysis results in a 2-dimensional chart, 3dimensional chart, and table. The 2-dimensional displays the AMR, VP, BE, AMR+BE, and other services and the RSCP_DL, Ec/Io_DL, and TP counters. The 3-dimensional chart displays the PS and CS services and the RSCP_DL, Ec/Io_DL, and TP counters. The summarized analysis table lists the summary of all counters corresponding to the services in the 2-dimensional chart. Coverage analysis results can be exported as CSV or XLS files. You can optimize network coverage based on these analysis results.
Coverage Analysis Theme – Network Assessment •
Assess network coverage based on the call information of UEs.
•
The network coverage is good (RSCP > -100 dBm and ECNO > -12 dB in 85% cases)
ECNO is poor.
Both are poor.
The network coverage can be assessed based on the thresholds of two counters.
Both are good.
RSCP is poor.
As shown in the figure, the network coverage is good. The RSCP is above -100 dBm in 90% cases.
As shown in the figure, the network coverage is good. The ECNO is above -12 dB in 90% cases.
Generally, the network coverage is about 1 km.
UMTS Coverage Analysis – Problem Locating Service Type
Total Number of TP Measurement Reports
Total Number of RSCP Measuremen t Reports
Total Number of ECNO Measurement Reports
Average TP
Average RSCP (dBm)
Average ECNO (dB)
AMR
81
234
234
5
-91
-8
BE
7039
11945
11945
3
-103
-11.5
View the 2-dimensional chart of the BE service. UEs are averagely 600 m distant (TP = 3 in 70% cases). View the 3-dimensional chart (PS: ECNO VS TP, PS: RXCP VS TP). When TP is 3, both RSCP and ECNO are poor. The RSCP is averagely above -102 dBm, and the ECNO is about -11 dB.
A user complains that the network service is unavailable in an area, which is covered by the Weixing 31 cell. By analyzing the UMTS coverage data, you can see that the RSCP and ECNO of PS services in the cell are poor. If no neighboring cell of the cell is missing, check whether the antenna downtilt of the cell can be adjusted.
Overview of UMTS Intra-Frequency Neighboring Cell Analysis The information in the measurement reports (MRs) provided by UEs reflects the actual propagation of wireless signals. With the UMTS intra-frequency neighboring cell analysis function, you can summarize and analyze the MRs and events sent by UEs to detect missing and redundant neighboring cells and neighboring cells whose priorities need to be adjusted and solve network quality problems due to redundant and missing neighboring cells The process of intra-frequency neighboring cell analysis is as follows: and incorrect priorities. 1. Identify, analyze, and optimize the cells affected by low handover success rate and 2. 3. 4.
5.
high call drop rate, cells frequently complained by users, and cells in VIP areas. Add neighboring relationship for the obviously missing neighboring cells. Delete neighboring relationship for the obviously redundant neighboring cells (distant and seldom accessed). The missing of some neighboring cells may be caused due to network coverage problems. Therefore, observe the relative geographic position as well as the antenna height, azimuth, downtilt, and serving region of the site. These problems may be caused due to coverage overlapping, reverse connections of antennas, or micro cell leakage. Implement the optimization scheme and assess the optimization effect.
Case 1 of UMTS Intra-Frequency Neighboring 1. A neighboring cell is obviously missing. Cell Analysis 2. The antenna is blocked or the NodeB cannot function normally. 3. The azimuth of the antenna is inappropriate or coverage overlapping occurs.
4. 1.
3.
There is serious coverage overlapping: The NodeB of the No. 1 defined neighboring cell (Beiai 12) is 40 m high, and its antenna downtilt is only 1 degree. The Yanqiao site is 25 m high. As a result, the coverage of the Beiai 12 site is overlapping. You are advised to increase the downtilt of the Beiai 12 antenna to control its coverage.
Large quantities of tier-1 neighboring cells of the Yanqiao 12 cell are missing.
2.
The Zhongding 31 cell and Yanqiao 12 cells are obviously facing each other, but they are considered as redundant neighboring cells. Check whether the antenna of the Zhongding 31 is blocked or whether the Zhongding 31 cell functions normally.
The directions of the Beiai 22 and 32 cells are opposite to that of the Yanqiao 12 cell, and therefore these neighboring cells are obviously redundant, as shown in the GIS window. The Zhongjiaquan 12 cell is a reverse tier-2 neighboring cell of the Yanqiao 12 cell, the activation times of this cell is 0, and this cell reports 0 1A1C event. Therefore, the neighboring relationship can be deleted.
UMTS Pilot Pollution Analysis
The Nastar provides the UMTS pilot pollution analysis function, can analyze daily call information to identify the cells affected by pilot pollution, source of pollution, and severity of pollution. The Nastar can display the analysis results on a map for you to view details, The principles of drive the function are as improves follows: the accuracy of which saves the test time and The Nastar analyze the intra-frequency measurement information in problem locating. each MR. If the number of intra-frequency cells whose difference in strongest signals is lower than a preset threshold exceeds three in an MR, the MR is considered as a pilot-polluted MR. The optimal cell in the activation set of the MR is considered as a pilot-polluted cell, and the cells in the non-activation set of the MR and meeting a preset threshold are considered as pilot-polluting cells.
UMTS Pilot Pollution Analysis – Viewing Analysis Results Switch between the pilotpolluted cell list and pilotpolluting cell list.
Top n pilotpolluted cells
Pilot-polluting cell list of top n pilotpolluted cells
Geographi c observatio n of Pilot Pollution Display pilot-polluted and pilot-polluting cells in the GIS window.
•
UMTS Uplink Interference Analysis
The Nastar provides the UMTS uplink interference analysis function. Using this function, you can manage UMTS uplink interference analysis tasks and query UMTS uplink interference analysis reports. UMTS uplink interference analysis is based on the Received Total Wideband Power (RTWP) data reported by NodeBs. Locate the NodeBs that suffer uplink interference according to the interference order. Check whether the value of the main Received Signal Strength Indicator (RSSI) is normal based on the main interference signal strength and trend chart to analyze the characteristics of interference. View the main interference difference layout chart to check whether the antenna has any problem in reception.
Case 1 of UMTS Uplink Interference Analysis Interference is detected. Uplink interference is detected, and the strength of the typical interference signal is about -85 dBm.
The uplink antenna is faulty. Check the maindiversity level layout. If the layout is obviously unbalanced (> 5 dB), a branch of the reception channel is faulty.
Main - diversity Normal
Abnormal
Case 2 of UMTS Uplink Interference Analysis Cell id 62231 & 62233 having main and diversity swap, RTWP Trend of sector1 Main RX is similar with sector3 Diversity RX
UMTS Cell Performance Analysis
A one-time cell performance analysis task is created on the Nastar. Then, the SAU connected to the RNC retrieves abnormal call records occurring in the specified period and specified cell from mass call records and performs exception analysis on the abnormal cell. Exception class analysis result
Abnormal object selection area
Exception type analysis result summarization area
Bottom analysis: BottomN cell analysis BottomN user analysis BottomN terminal analysis
Catalogue 1
Nastar Functions Overview
N 2 astar Routine optimization functions introduction 3
Nastar Terminal analysis function introduction
4Nastar Geographic analysis function introduction 5Nastar VIP complaint analysis function introduction
UMTS Terminal Analysis – Application Scenarios Terminal penetration analysis
Periodically analyzes the penetration of each type of terminals on the network and obtains information about subscribers’ consumption behaviors to provide information for market strategy making.
Terminal capability analysis
Assesses a terminal supporting a capability on the network to provide basis for telecom operators to deploy a network supporting a feature.
Terminal performance analysis
Analyzes network problems caused by a certain type of terminals and helps telecom operators check the network performance of newly launched terminals.
Page 20
UMTS Terminal Analysis – Principle
IMEI (International Mobile Equipment Identity) An IMEI, which is globally unique, consists of 15 digits and maps to one mobile terminal.
TAC Type approval code, sixdigit, indicating equipment type Final assembly code, two-digit, indicating vendors
FAC
SNR
SP Check code, onedigit, which is spare currently
Sequence number, six-digit, identifying equipment indicated by a TAC and FAC
You can use only the first eight digits of an IMEI to identify the vendor and model of a mobile terminal. Nastar obtains IMEI information reported by the mobile equipment, measures and analyzes the number of terminals, traffic, and performance KPIs based on the terminal type, to solve terminal performance problems.
Page 21 Page 21
UMTS Terminal Analysis Result – Penetration Analysis Terminal penetration analysis can be performed in the following dimensions: • IMEITAC_OS_version • OS_version • OS • vendor • Terminal model • Terminal network type • Terminal type • Data transmission • Supporting Wi-Fi
Number and proportion of terminals
Assess the penetration of each type of brand terminals on the live network to provide information for building network and making market strategies.
UMTS Terminal Analysis Result – Terminal Capability Analysis NE scope
Proportion of terminals supporting a capability
Terminal capabilities
Assess the proportion of terminals supporting a capability to provide basis for telecom operators to deploy a network supporting a certain feature.
UMTS Terminal Analysis Result – Terminal Performance Analysis Terminal performance KPIs
Terminal performance counter set
Performance KPIs of cells and bearers
Assess performance counters of terminals on the live network to identify terminals where problems occur on the network.
UMTS Network Geographic Observation – Functional Principle Network structure
Network geographic observation Event map
RNC
Traffic map
Data
M2000
Coverage map
Data
Nastar 1. Measurement information collection and position locating 2. Network assessment and geographic observation
City map Based on the radio link measurement information about actual users, and information about users' calls, on the live network, as well as a feature database generated by using a planning tool based on coverage prediction, the Nastar locates the positions of calls or events and displays the coverage, traffic, and event distribution of the radio network on grid maps in the GIS.
Catalogue 1
Nastar Functions Overview
N 2 astar Routine optimization functions introduction 3 Nastar Terminal analysis function introduction 4
Nastar Geographic analysis function introduction
5Nastar VIP complaint analysis function introduction
UMTS Network Geographic Observation – Locating Principle Matching based on the feature database
CHRs Call logs
MRs (Online users)
Locating algorithm Configuration and engineering
CellID + delay +…
Data preprocessing Geographic observation of locating results
parameters
Coverage prediction or AGPS Note: 1. Feature database—based locating requires that a feature database containing information such as the levels of all cells on the network be established in advance. The locating precision increases with the improvement of the accuracy of the database information. 2. Distance prediction—based geometric locating requires that the MRs contain sufficient information about neighboring cells and delays. It is inapplicable in certain scenarios, and cannot meet the requirement on high precision.
UMTS Network Geographic Analysis – Result Viewing Geographic observation of analysis results
Statistical results of grid counters
Legend
Select a service counter.
View grid details to further analyze a problem.
UMTS Network Geographic Analysis
–
Cell Coverage Analysis
If analysis results are displayed in GIS-based grid map layers, you can right-click a cell to view the grids covered by the cell on a certain layer. This helps network optimization engineers rapidly and easily perform coverage analysis on a single cell.
UMTS Network Geographic Analysis –
Multi-
Layer Association Analysis Start multi-layer association
Select multi-layer association at the association analysis layer
Note: Nastar can combine layers such as the coverage, quality, and traffic layer in multiple windows simultaneously as required. Multiple types of information about an area can be displayed by means of association based on its latitude and longitude. This facilitates problem analysis and improves work efficiency.
UMTS Network Geographic Analysis – Call Drop Analysis In areas where call drops occur, coverage quality is poor and traffic is high.
Catalogue 1
Nastar Functions Overview
N 2 astar Routine optimization functions introduction 3 Nastar Terminal analysis function introduction 4Nastar Geographic analysis function introduction
5
Nastar VIP complaint analysis function introduction • VIP KPI analysis • VIP complaint support analysis
UMTS VIP Analysis – Application Scenarios
Application Scenario 1: Routine VIP user or VIP group performance monitoring Periodically monitor the service usage of VIP users or VIP groups and identify active cells during routine network O&M to detect network problems, improve the experience of VIP users or VIP groups, and retain key user groups.
Application Scenario 2: Analysis of service activity and experience trends of VIP users or VIP groups Monitor changes and trends in service activities and experience of VIP users or VIP groups over a long period of time to provide custom services.
Application Scenario 3: All-signaling analysis of calls of VIP users Analyze the release and service experience of calls of very important VIP users. The Nastar provides a dedicated all-signaling analysis function.
UMTS VIP Analysis - Principles During a call, the mobile terminal reports the IMSI, start time and end time of the call, and cells that are accessed and released during the call. An IMSI is a 15-digit number. It is the internationally unique identity of each mobile subscriber. The first 3 digits are the Mobile Country Code (MCC). For example, 460 indicates People's Republic of China. The following 2 digits are the Mobile Network Code (MNC), indicating the mobile network to which the mobile subscriber belongs.
The remaining 10 digits are the Mobile Subscription Identification Number (MSIN) used for identifying the mobile subscriber on the mobile network.
Create a one-time or periodic VIP analysis task on the Nastar. After this task is started, the SAU that connects to the RNC will filter the large quantities of call history records (CHRs) of specific IMSIs within specific cells and periods based on the IMSIs of VIP users and obtain all CHRs of VIP users. CHRs of normal calls that occur before and after the abnormal call are also collected, which may be required in the analysis of certain abnormalities.
UMTS VIP Analysis - Specifications No .
Specifications
V600R011
1
UMTS VIP analysis – Maximum number of VIP users supported by an analysis report (VIP level: common)
30,000
2
UMTS VIP analysis – Maximum number of VIP users supported by in-depth record analysis (VIP level: common)
30,000
3
UMTS VIP analysis – Maximum number of VIP users supported by all-signaling analysis (VIP level: important)
100
4
Minimum period supported by a periodic analysis task
0.5 hours
5
Maximum storage duration of analysis results
30 days
Note: The all-signaling analysis capability depends on the equipment version. RAN10.0 to RAN12.0 Not supported RAN13.0 100 RAN14.0 100
UMTS VIP Analysis – Security Management
VIP user information is very sensitive. To ensure the security of VIP user information, the Nastar provides integrated security management and control functions.
Sensitive VIP user information •
Sensitive VIP user information includes the IMSI of a VIP user, MSISDN/mobile phone number, VIP analysis results, and active cell information of the VIP user.
Security management and control means •
No VIP user information (such as SMS messages or call contents) can be captured on networks.
•
A stricter scheme for fully encrypting IMSI and MSISDN is provided.
•
A stricter scheme for partially encrypting the reserved IMEI-TAC is provided.
•
Rights control is added for VIP group management and viewing, which is precise to the VIP user level.
•
Rights control is added for VIP analysis theme operations and viewing.
•
Sensitive VIP information (such as IMSI) is removed from the GUI that displays VIP analysis results.
•
Rights control is added for automatic email sending of VIP analysis results.
Secure and flexible rights setting •
Rights can be authorized by VIP group or VIP user. In this way, different accounts can use the same VIP group or VIP user.
•
Operation rights and viewing rights are under separate control.
UMTS VIP Analysis –Viewing Analysis Results by User Level Summarized analysis table
Select the VIP object.
Active cell analysis table of specified VIP groups or users
Select the service type.
Select counter sets.
The display pattern of analysis results is improved: Analysis results are displayed in tables, which makes it more convenient for engineers to quickly detect abnormal VIP users based on counters. Analysis results can be filtered flexibly by VIP group, service type, and counter set. While retaining the function of in-depth analysis of a specified VIP user, Nastar V600R010 also provides the function of in-depth analysis of a specified VIP user based on specified abnormal counters.
UMTS VIP Analysis –Viewing Analysis Results by Network Level Summarized analysis table
Select NEs.
Active cell analysis table of VIP users of a specified NE
Select the service type.
Select counter sets.
Provides the function of analyzing active cells of abnormal VIP users by network level. Analysis results are displayed in tables, which makes it more convenient for engineers to quickly detect the active cells where VIP users are abnormal based on counters. Analysis results can be flexibly filtered by NE, service type, and counter set.
UMTS VIP Analysis –All Signaling Analysis In-depth analysis can be performed on the whole signaling procedures of the calls of important VIP users who have subscribed to the required data. 1. Two analysis modes are provided: table and flowchart. 2. Signaling messages at the Uu, Iu, Iub, Iur, and Iupc interfaces can be analyzed. Tip: Double-click a signaling message. The Signal Detail Information dialog box is displayed.
Tip: Click a signaling message. The associated signaling message data in the flowchart and table is displayed.
UMTS VIP Analysis – Analysis VIP Trend
An periodic VIP analysis task can be set to analyze the trends of VIP services by VIP user, time period, and counters. With this task, engineers can monitor the changes in counters and user behaviors and detect the problems that cannot be detected through a one-time analysis task. Set complicated conditions for filtering the VIP users that are constantly affected by small problems.
Select VIP objects. Select the service type.
Select counter sets.
Two analysis modes
Trend analysis
are supported.
chart
UMTS Complaint Analysis Support — Result Overview
Service selection area
Signaling procedure analysis area
Selection area based on user or cause type
Summarized information analysis area
Special function analysis area Mobility analysis Measurement report analysis • Service usage analysis • •
User information analysis area Access/ release process analysis area Statistics information analysis area
UMTS Complaint Analysis Support— Summary Report Fields indicating exception causes: provides exception analysis results based on related information
Select the service type to be viewed Abnormal calls are displayed.
Select the user & abnormal object to be viewed
Nastar V600R011 provides the following functions: Filtering and viewing analysis results based on a selected service type Analyzing exceptions for various types of services
Release cause field analysis Exception causes recorded by equipment
UMTS Complaint Analysis Support— MR Analysis
Measurement information before call release is as follows: 1. IF MR data is provided: Analysis on measurement information in the whole procedure is provided. If MR data is not provided: For complaints made by a common user, analysis on a small quantity of measurement information before call release is provided. For complaints made by a VIP user, analysis on measurement information in the whole procedure is provided. 2. The measurement information analysis function provides two analysis modes: measurement information table and measurement information trend chart.
Tip: Key measurement indicates the radio link environment before call release.
Tip: With the help of the neighboring cell, MR, frequency, and uplink interference analysis, complaints can be handled more efficiently.
Measurement information before call release is displayed in chart: Serving cell + neighboring cell: Ec/No Serving cell + neighboring cell: RSCP Serving cell: UE TX Power Inter-RAT neighboring cell GSM: RSSI Inter-RAT neighboring cell LTE: RSRP and RSRQ
UMTS Complaint Analysis Support —Service Analysis (RAB-Level)
For RAN14.0 and later versions, Nastar V600R011 provides the RAB-level service analysis function for engineers to: Quickly obtain the use of multiple RAB services during one RRC connection setup. Identify the setup and release of combined services to locate exceptions caused by combined services. Analyze service quality trend during RAB services.
UMTS Complaint Analysis Support —Access Failure Analysis Case Signaling analysis: 2011-04-26 16:33:27 UE made a PS interactive call in cell 43481 2011-04-26 16:33:28 CN sent the RAB Assignment request to RNC, then RNC sent the RB setup message to UE 2011-04-26 16:33:33 UE failed to send the RB setup complete after 5 seconds (timer expired), so RNC sent the IU release command to release the resource.
MR analysis: 2011-04-26 16:33:27 At the time of accessing, the EcNO of the cell43481 is -8dB 2011-04-26 16:33:28 At the time of RB setup, the EcNo of the cell43481 is -15dB and the RSCP is -112. It is very week signal.
Conclusion: UE failed to setup the RB when the coverage of the serving cell is very bad (EcIo is -15dB and RSCP is -112).
UE sometimes cannot browsing internet website, then after a short period (around 30s) user are able to browsing internet again. Investigation by Nastar: 1.
Checking the signaling flow, found that: UE send the service request but CN didn’t send RAB request to RNC ; after waiting 30s, UE initiate PDP de-active.
2.
During this waiting period, CN initiate PDP modify procedure and this procedure take around 8s which is
Rootabnormal, so because of this abnormal PDP Mod delay, cause: CN didn’t send RAB assignment. 1. Many Update PDP Context Request/Response between SGSN and GGSN , We found sometime that GGSN does not send Update PDP Context Response to SGSN because the same Sequence Number for different TEID user are sent from SGSN nearly same time. 2. Huawei SGSN completely complies with the protocol 3GPP TS 29.060 , The Sequence Solution : value in the response message is Number from the request message. That the 1. copied R&D to optimize the SGSN implementation for is, using sequence number is assigned by the request different sequence to response resolve the problem. The transmitting sidenumber and the patch already release 20th not May care , TWA&CWDC1&SUK transmitting side does about the Sequence Number already upgraded andvalue. active DT function.
VIP Complaint HSUPA throughput low Investigation by Nastar: 1.
User established PS DL in HSDPA but UL in R99 PS at CELL ARE1W21
2.
User Uplink throughput is very low around 1kbps (2s transmit 292bytes)
3.
RF condition of serving cell is acceptable, EcIo is -8dB; RSCP is -86dBm
4.
User suffer SHO fail, reason is HSUPA User Number congestion in target cell
5.
Nastar Traffic Map show high traffic in this area
VIP Complaint HSUPA throughput low Based Nastar initial analysis, involved Cell is done 1. performance During the complaint period, site suffer congestions, active Users numbers are very high 2.
HSUPA user number already reach the maximum (F1 max is 6, F2 is 20, F3 is 20)
Solutions: 3. 1.
Low throughput is because of high load of this site. Split this site to 4 sectors to expand the capacity.
AIS BKK Plan new site in Phase 2 ( Total #688 Sites in Batch 6-10 )
