IBCA(GBSS14.0_03).pdf

GSM BSS GBSS14.0

IBCA Feature Parameter Description Issue

03

Date

2012-12-31

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2012. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd. Address:

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Website:

http://www.huawei.com

Email:

[email protected]

Issue 03 (2012-12-31)

Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

i

GSM BSS IBCA Feature Parameter Description

Contents

Contents 1 About This Document..................................................................................................................1 1.1 Scope..................................................................................................................................................................1 1.2 Intended Audience..............................................................................................................................................1 1.3 Change History...................................................................................................................................................1

2 Overview.........................................................................................................................................3 2.1 Introduction........................................................................................................................................................3 2.2 Benefits...............................................................................................................................................................3 2.3 Specifications......................................................................................................................................................3

3 Technical Description...................................................................................................................6 3.1 Overview............................................................................................................................................................6 3.2 Calculating Path Losses......................................................................................................................................7 3.3 Calculating CIRs.................................................................................................................................................9 3.3.1 Interference Signal Search.........................................................................................................................9 3.3.2 Evaluating CIRs by Channel.....................................................................................................................9 3.4 Selecting an Optimal Channel..........................................................................................................................11

4 Related Features...........................................................................................................................12 4.1 Synchronization-related Features.....................................................................................................................12 4.2 Frequency Hopping..........................................................................................................................................12 4.3 Connection Inter BSC over IP..........................................................................................................................12 4.4 Power Control...................................................................................................................................................12 4.5 Flex MAIO.......................................................................................................................................................13 4.6 Very Early Assignment....................................................................................................................................13 4.7 Multi-site Cell...................................................................................................................................................13 4.8 High Speed Circuit Switched Data...................................................................................................................13 4.9 Concentric Cell.................................................................................................................................................14 4.10 BCCH Dense Frequency Multiplexing...........................................................................................................14 4.11 Interference Band Measurement.....................................................................................................................14 4.12 Dynamic Power Sharing.................................................................................................................................14

5 Impact on the Network...............................................................................................................15 5.1 System Capacity...............................................................................................................................................15 5.2 Network Performance.......................................................................................................................................15 Issue 03 (2012-12-31)


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Contents

6 Engineering Guidelines.............................................................................................................16 6.1 When to Use IBCA...........................................................................................................................................16 6.2 Data Preparation...............................................................................................................................................16 6.3 Network Planning.............................................................................................................................................17 6.4 Deploying IBCA...............................................................................................................................................19 6.5 Monitoring........................................................................................................................................................19 6.6 Parameter Optimization....................................................................................................................................20 6.6.1 Call Drop Rate.........................................................................................................................................20 6.6.2 Handover Success Rate...........................................................................................................................21 6.6.3 Congestion Rate.......................................................................................................................................21 6.7 Troubleshooting................................................................................................................................................22

7 Parameters.....................................................................................................................................23 8 Counters........................................................................................................................................62 9 Glossary.........................................................................................................................................63 10 Reference Documents...............................................................................................................64

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1 About This Document

1

About This Document

1.1 Scope This document describes the GBFD-117002 IBCA feature, including its working principles and engineering guidelines. IBCA is short for Interference Based Channel Allocation.

1.2 Intended Audience This document is intended for: l

Personnel who need to understand the IBCA feature

l

Personnel who work with Huawei GSM products

1.3 Change History This section provides information about the changes in different document versions. There are two types of changes, which are defined as follows: l

Feature change: refers to a change in the IBCA feature of a specific product version.

l

Editorial change: refers to a change in wording or the addition of information that was not described in the earlier version.

Document Issues The document issues are as follows: l

03 (2012-12-31)

l

02 (2012-11-07)

l

01 (2012-04-28)

03 (2012-12-31) This is the third official release of GBSS14.0. Issue 03 (2012-12-31)


1


1 About This Document

Compared with issue 02 (2012-11-07) of GBSS14.0, issue 03 (2012-12-31) of GBSS14.0 incorporates the changes described in the following table. Change Type

Change Description

Parameter Change

Feature change

Changed the following chapter:

None

6.1 When to Use IBCA Editorial change

None

None

02 (2012-11-07) This is the second official release of GBSS14.0. Compared with issue 01 (2012-04-28) of GBSS14.0, issue 02 (2012-11-07) of GBSS14.0 incorporates the changes described in the following table. Change Type

Change Description

Parameter Change

Feature change

None

None

Editorial change

Optimized the descriptions and added the following chapters:

None

l 4 Related Features l 5 Impact on the Network l 6 Engineering Guidelines

01 (2012-04-28) This is the first release of GBSS14.0.

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2 Overview

2

Overview

2.1 Introduction On a network where frequency resources are insufficient, frequencies are reused in neighboring cells. In such situations, severe co- and adjacent-channel interference occurs on the network, and cannot be eliminated even if frequency hopping (FH) technology is applied. When the number of calls on such a network exceeds a certain limit, interference between calls deteriorates the speech quality and the carrier-to-interference ratio (CIR) required by a call cannot be reached. As a result, call drops occur. Even if there is an idle channel on the network, the idle channel cannot be allocated to any calls because of severe interference. Therefore, frequency resource efficiency is limited, and network capacity decreases. To minimize interference on the network and increase network capacity, IBCA is introduced. With this feature, the BSC estimates the CIR of a new call during channel allocation and the interference the new call causes on established calls. Based on the estimation results, the BSC selects an optimal channel to carry the new call. This channel must meet the new call's requirement for CIR and have minimal interference on established calls after the channel is occupied.

2.2 Benefits This feature applies to networks using a tight frequency reuse pattern. It brings the following benefits: l

Alleviates network interference.

l

Increases the frequency resource efficiency and network capacity.

l

Improves the speech quality by considering interference between calls during channel allocation.

2.3 Specifications l

The following items need to be configured before the IBCA feature is enabled in a cell: – IBCA neighboring cells A maximum of 24 IBCA neighboring cells can be configured for an IBCA-enabled cell using NCELLTYPE.

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2 Overview

A maximum of six IBCA location cell groups can be configured for an IBCA-enabled cell. A maximum of 16 neighboring BSCs can be configured for a BSC when the inter-BSC IBCA is enabled. – Mobile allocation index offsets (MAIOs), mobile allocation (MA) groups, and the number of frequencies in each MA group Under an IBCA-enabled BSC, a maximum of three MA groups can be used in IBCAenabled cells and their neighboring IBCA cells. A maximum of one MA group can be configured for an IBCA-enabled cell. A maximum of 24 MAIOs can be configured for an IBCA-enabled cell. The following table lists the restrictions on the number of interference neighboring cells based on the number of MAIOs. No.

Number of MAIOs

Restriction on the Number of Interference Neighboring Cells

1

Number of MAIOs < 6

No restriction

2

6 ≤ Number of MAIOs < 12

The proportion of cells in which the number of interference neighboring cells exceeds 12 to all cells under a BSC cannot exceed 50%.

3



4



Only one MA group can be configured for an IBCA-enabled cell if the TRXs of the cell work on the same timeslot and frequency band. l

If IBCAUSRDYNCMEASURENCELL is set to YES(Yes) for an IBCA-enabled cell, the following conditions must be met: – IBCANHOASSWAITMEASURERPTTIME + IBCAHOASSWAITMEASURERPT TIME < CONTHOMININTV – IBCANHOASSWAITMEASURERPTTIME + IBCAHOASSWAITMEASURERPT TIME < NEWURGHOMININTV – IBCAEHOASSWAITMEASURERPTTIME + IBCAHOASSWAITMEASURERPT TIME < CONTHOMININTV – IBCAEHOASSWAITMEASURERPTTIME + IBCAHOASSWAITMEASURERPT TIME < NEWURGHOMININTV

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2 Overview

l

IBCA applies only to FH cells and is used for channel allocation only on the TRXs involved in FH.

l

IBCA does not support external packet control units (PCUs).

l

The total number of MA groups that can be configured for all IBCA neighboring cells of an IBCA-enabled cell cannot exceed 24. The detailed principles are as follows: – The serving cell is a single-band cell. – When the serving cell is a low-band (900/850 MHz) cell, only the number of MA groups in the low-band IBCA neighboring cells needs to be calculated. The maximum allowed number is 24. – When the serving cell is a high-band (1800/1900 MHz) cell, only the number of MA groups in the high-band IBCA neighboring cells needs to be calculated. The maximum allowed number is 24. – The number of MA groups needs to be calculated only once if the MA groups in IBCA neighboring cells are the same.

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3 Technical Description

3

Technical Description

3.1 Overview IBCA is a channel allocation algorithm. Each time before allocating TCHs, the BSC uses IBCA to perform an evaluation and allocates appropriate TCHs to MSs based on the evaluation result. Figure 3-1 shows the implementation of the IBCA algorithm during the assignment or handover procedure.

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Figure 3-1 Implementation of the IBCA algorithm during the assignment or handover procedure

To enable IBCA, set IBCAALLOWED to YES(Yes). IBCA consists of three phases: path loss calculation, CIR evaluation, and optimal channel selection. CIR evaluation is the basis of the IBCA algorithm. Path loss calculation is the prerequisite for evaluating CIRs. Based on the evaluated CIRs, the BSC measures the interference that a new call causes on the established calls. Then, the BSC selects the optimal channel for the new call.

3.2 Calculating Path Losses Path losses can be calculated first based on the measurement reports (MRs). After receiving an MR from an MS, the BSC interpolates and filters the measured values to obtain accurate MR data. The filter length is specified by IBCACALLINFOFILTERLEN. Based on the interpolated and filtered MR data, the BSC calculates the downlink and uplink path losses. Issue 03 (2012-12-31)


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If an MR is lost or the BSC fails to calculate a path loss based on the MR data, the BSC calculates the path loss as follows: l

For uplink and downlink path losses between the MS and the serving cell: – If the downlink MR is lost, the BSC calculates the downlink path loss based on the uplink path loss using the following formula: Downlink path loss = Uplink path loss + IBCADLPATHLOSSOFF – If the BSC fails to calculate the path loss between the MS and its serving cell based on the MR data, it uses the value of IBCASCELLPATHLOSS as the path loss.

l

For uplink and downlink path losses between the MS and the neighboring cell: Downlink path loss = Neighboring cell BCCH transmit power – Neighboring cell downlink BCCH signal level detected by the MS – If the BSC fails to calculate the downlink BCCH signal level in the neighboring cell based on the MR data: If the receive level of an IBCA neighboring cell is not included in N consecutive MRs, the BSC sets the receive level of the IBCA neighboring cell to the value of IBCANCELLPATHLOSSESTIMATE. The value N is specified by IBCANONMEANCELLSTATNUM. If the receive levels of different IBCA neighboring cells are not included in N consecutive MRs, the BSC calculates the receive levels of these IBCA neighboring cells using the following formula: Signal level of an IBCA neighboring cell = Detected minimum signal level of another neighboring cell – IBCARXLEVOFFSET – If no receive levels are reported in the MRs, the BSC calculates the downlink path loss using the following formula: Downlink path loss between an MS and its neighboring cell = Downlink path loss between the MS and its serving cell + IBCAPATHLOSSOFF

If the BSC fails to calculate the path loss based on the MR data, it uses the following algorithm and function to assist the calculation: l

Inter-cell dependency matrix (ICDM) algorithm specified by IBCAICDMSWITCH Enabling the ICDM algorithm decreases the accuracy of the evaluated path losses. Therefore, do not enable the ICDM algorithm. In this condition, the IBCAPLFILTFACTOR parameter does not take effect.

l

Single-user dynamic measurement function specified by IBCAUSRDYNCMEASURENCELL Enabling the single-user dynamic measurement function may result in an incorrect measurement for neighboring cells because certain MSs do not support this function. Furthermore, the network performance deteriorates. Therefore, do not enable the singleuser dynamic measurement function. In this condition, the following parameters do not take effect: – IBCADYNCMEASURENCELLALLOWED – IBCAASSWAITMEASURERPTTIME – IBCANHOASSWAITMEASURERPTTIME – IBCAEHOASSWAITMEASURERPTTIME

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3.3 Calculating CIRs 3.3.1 Interference Signal Search Valid signals of a call are interference signals for other calls. The interference sources for a call are various, and their interference signal levels differ. The BSC, however, do not measure all interference signals. Instead, it determines the interference source scope before calculating CIRs. In the neighboring cells whose NCELLTYPE is IBCANCELL(IBCA Neighboring Cell) or HANDOVERANDIBCANCELL(Handover and IBCA Neighboring Cell), the BSC searches for all calls that interfere with a new call. In addition, the BSC selects N established calls that have strong interference on the new call for CIR calculation. The value N is specified by IBCAMAXINTFSRCNUM. The calls controlled by the BSC are processed by different central processing units (CPUs), but the probability of interference occurring is calculated by the XPUa or XPUb board. Therefore, the BSC needs to report the information about the calls in the same IBCA cell group on each CPU to the XPUa or XPUb board at an interval specified by IBCAINBSCINFORPTPRD. If the IBCA neighboring cell group contains an external neighboring cell, the BSC needs to report the information about the calls in the serving cell to the BSC controlling the external neighboring cell over the inter-BSC communication links at an interval specified by IBCAOUTBSCINFORPTPRD.

3.3.2 Evaluating CIRs by Channel After the IBCA is enabled, the MAIOs can be dynamically allocated. Therefore, the BSC must traverse all the available channels and MAIOs to calculate CIRs. To facilitate the description, an available channel and MAIO are defined as a candidate channel. This section describes the evaluation procedure in the following aspects: l

Calculating CIRs when allocating different candidate channels for a new call.

l

Calculating the decrease in CIRs of established calls when a new call is connected over different candidate channels.

Figure 3-2 shows the procedure for evaluating CIRs based on the MR data and path losses. Figure 3-2 Calculating CIRs

As shown in Figure 3-2, n indicates the number of candidate channels that can be allocated.

Calculating CIRs of a New Call by Channel The BSC traverses all the candidate channels and calculates the CIRs when a new call is connected over different candidate channels for subsequent channel allocation evaluation. Issue 03 (2012-12-31)


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The formulas are as follows: l

CIR of a new call = Valid signal level – Interference signal level

l

Valid signal level = Transmit power of the call – Path loss

l

Interference signal level = Transmit power of the interference source – Path loss

The calculation of downlink CIR of a new call is used as an example. Figure 3-3 shows the downlink interference on a call. Figure 3-3 Downlink interference on a call

Assume that A is a new call and B is an established call. The downlink signals of call B have interference on call A. The downlink CIR of cell A is calculated using the following formula: Downlink CIR of cell A = (Transmit power of cell A – Downlink path loss between cell A and MS A) – (Transmit power of cell B – Downlink path loss between cell B and MS B) When the network has high requirements for speech quality and the network congestion rate is not high, set IBCASOFTBLKSWITCH to YES(Yes) and IBCAFRSOFTBLKTHRD to an appropriate value. If the CIR of an established call is less than the value of IBCAFRSOFTBLKTHRD after a new call is connected over the channel occupied by the established call, the BSC considers the interference on the established call unacceptable. As a result, the BSC eliminates the channel occupied by the established call. The soft block thresholds of different services are specified by IBCAFRSOFTBLKTHRD, IBCAHRSOFTBLKTHRD, IBCAAFRSOFTBLKTHRD, IB CAAHRSOFTBLKTHRD, and IBCAWAFRSOFTBLKTHRD. If the network has no strict requirements for speech quality and the network congestion rate is high, set IBCASOFTBLKSWITCH to NO(No). After that, the BSC will not eliminate a channel even if the CIR of the established call on the channel is less than the value of IBCAFRSOFTBLKTHRD.

Calculating CIRs of Established Calls The BSC traverses all the candidate channels and calculates the decrease in the CIR of each established call after a new call is connected over a channel occupied by an established call. This facilities the subsequent channel allocation. Using the CIR, the BSC evaluates the interference a new call causes on an established call. This is because the new call interferes with the established call on the same channel. If the interference Issue 03 (2012-12-31)


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is strong, the CIR of the established call decreases and the speech quality of the established call is affected. The calculation for CIRs of established calls includes the following: l

CIRs of established calls before a new call is connected

l

CIRs of established calls after a new call is connected

The specific calculation method is similar to the method for calculating CIRs of a new call. When the network has high requirements for speech quality and the network congestion rate is not high, set IBCASOFTBLKSWITCH to YES(Yes) and IBCAFRSOFTBLKTHRD to an appropriate value. If the CIR of an established call is less than the value of IBCAFRSOFTBLKTHRD after a new call is connected over the channel occupied by the established call, the BSC considers the interference on the established call unacceptable. As a result, the BSC eliminates the channel occupied by the established call.

3.4 Selecting an Optimal Channel Based on the evaluated CIR of the new call and the interference the new call causes on established calls, that is, the decrease in CIRs of established calls, the BSC arranges all candidate channels in sequence. According to the configured channel selection scheme, the BSC selects a channel for the new call. The method for selecting a channel for a new call is specified by IBCAMAIOUSMTD: l

0(Max. optimized MAIO): The BSC selects the channel with the highest priority for the new call.

l

1(Randomization MAIO): The BSC randomly selects a channel whose CIR exceeds the value of IBCATARGETCIRTHRSH from the candidate channels.

The BSC preferentially allocates calls to the BCCH TRX. The value of IBCAFREEBCCHCHANTHRSHOLD indicates the minimum number of idle TCHs reserved on the BCCH TRX. If the network congestion rate is high, set this parameter to 0.

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4 Related Features

4

Related Features

4.1 Synchronization-related Features The IBCA feature depends on the GBFD-118201 Soft-Synchronized Network or GBFD-510401 BTS GPS Synchronization feature. IBCA enables the BSC to allocate channels based on the interference measured on the same timeslot. The interference on the same timeslot, however, can be accurately measured only in a synchronous network.

4.2 Frequency Hopping The IBCA feature depends on the GBFD-113701 Frequency Hopping (RF hopping, baseband hopping) feature. IBCA is only available in FH mode.

4.3 Connection Inter BSC over IP Inter-BSC IBCA depends on the GBFD-118621 Connection Inter BSC over IP feature. This is because inter-BSC IBCA requires an interconnection between BSCs.

4.4 Power Control The IBCA feature depends on the GBFD-117601 HUAWEI III Power Control Algorithm feature. Do not enable the GBFD-117602 Active Power Control feature when IBCA is enabled. When IBCA is enabled, the system performs a power forecast based on the receive level and calculated CIRs in the process of initial access assignment or service channel activation during intra-BSC handovers. The MSs and BTSs can therefore adjust the transmit power based on the forecasted power, which is more accurate than that when the Active Power Control feature is used. After connecting a new call over the channel allocated using the IBCA algorithm, the BSC calculates the uplink and downlink initial transmit power using Huawei III power control Issue 03 (2012-12-31)


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4 Related Features

algorithm. For more details, see Power Control Feature Parameter Description. When IBCA is enabled, the BSC adds an offset on the following receive levels and receive qualities: l

Uplink target receive level

l

Downlink target receive level

l

Uplink target receive quality

l

Downlink target receive quality The specific offset is specified by the following parameters:

l

IBCAINITPCRXLEVULOFFSET

l

IBCAINITPCRXLEVDLOFFSET

l

IBCAINITPCRXQUALULOFFSET

l

IBCAINITPCRXQUALDLOFFSET

4.5 Flex MAIO The IBCA feature is mutually exclusive with the GBFD-117001 Flex MAIO feature. Both the IBCA and Flex MAIO features are used for calculating interference. They cannot be enabled at the same time because they use the same bit to control the channel priority.

4.6 Very Early Assignment The IBCA feature is mutually exclusive with the very early assignment function in the GBFD-110502 Assignment and Immediate Assignment feature. IBCA enables the BSC to allocate TCHs based on the measured interference during the assignment or handover procedure. If the very early assignment function has been enabled for the calling MS, the BSC directly assigns a TCH for the calling MS during the immediate assignment. In this condition, the IBCA feature does not take effect. For details about the very early assignment function, see Assignment and Immediate Assignment Feature Parameter Description.

4.7 Multi-site Cell The GBFD-510104 Multi-site Cell feature is mutually exclusive with the single-user-based dynamic measurement function in the IBCA feature. The Multi-site Cell feature and the single-user dynamic measurement function use the same Abis interface resource to send information about the neighboring cells.

4.8 High Speed Circuit Switched Data The IBCA feature is mutually exclusive with the GBFD-119406 High Speed Circuit Switched Data feature. The High Speed Circuit Switched Data feature is implemented based on multislot binding technology while the IBCA feature is implemented based on only one timeslot. Issue 03 (2012-12-31)


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4 Related Features

4.9 Concentric Cell The IBCA feature is mutually exclusive with the GBFD-114501 Co-BCCH Cell and GBFD-113201 Concentric Cell features. This is because IBCA cannot be enabled in concentric cells.

4.10 BCCH Dense Frequency Multiplexing Do not enable the GBFD-118001 BCCH Dense Frequency Multiplexing feature when IBCA is enabled. The BCCH Dense Frequency Multiplexing feature regards a cell as two logical layers: TCH layer on the BCCH TRX and FH layer on other TRXs. IBCA supports TCH assignment and handover only on the FH layer. If the two features are enabled at the same time and the traffic on the FH layer is heavy, the BSC allocates TCHs on the BCCH TRX. As a result, the number of available PDCHs decreases, and PS performance deteriorates.

4.11 Interference Band Measurement Do not enable the interference band measurement function when IBCA is enabled. When IBCA is enabled, MAIOs are dynamically allocated, and therefore the interference band measurement results are inaccurate. To disable the interference priority function during channel assignment, set INTERFPRIALLOW to NO(No).

4.12 Dynamic Power Sharing Do not enable the GBFD-118106 Dynamic Power Sharing feature when IBCA is enabled. The Dynamic Power Sharing feature uses the channel assignment algorithm based on power sharing and coverage control. The IBCA feature uses the interference-based channel assignment algorithm. The gains from the IBCA feature are insignificant after both the features are enabled.

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5 Impact on the Network

5

Impact on the Network

5.1 System Capacity The IBCA feature enables the BSC to calculate interference based on network synchronization and allocates a channel with less interference to a new call. This improves the speech quality and therefore increases the network capacity.

5.2 Network Performance Enabling the IBCA feature improves quality-related KPIs, such as the mean opinion score (MOS) of voice services and high quality indicator (HQI). The IBCA feature requires synchronous network and cyclic hopping. Therefore, if the calculated interference is significantly different from the actual interference, for example, in the case of high-speed moving, strong interference may exist on the allocated channel. The interference, however, persists until a handover or call drop occurs. This decreases the handover success rate and increases the call drop rate. Therefore, enabling IBCA improves the speech quality but has an adverse impact on the CS call drop rate and handover success rate.

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6 Engineering Guidelines

6

Engineering Guidelines

6.1 When to Use IBCA Enable the IBCA feature in the following scenarios: l

Synchronous network: Synchronous network is the basis of the IBCA algorithm. The synchronous network can be implemented using the following methods: – Add the GPS hardware on the BTS (hard synchronization). – Configure synchronization parameters on the BSC (soft synchronization).

l

Frequency reuse pattern: 1x1 or 1x3 (FR load > =75% and recommended bandwidth < 7.4 Mbit/s)

FR load = Number of TRXs participating in the FH/Total number of allocated frequencies In the 1x1 or 1x3 frequency reuse pattern, FR load is calculated by cluster using the following formula: FR load = Number of TRXs per cluster/Number of frequencies per cluster In the 1x1 frequency reuse pattern, a cluster refers to frequencies in a cell. In the 1x3 frequency reuse pattern, a cluster refers to frequencies in three cells under a BTS. l

Single frequency network: IBCA does not support CoBCCH networking and dualfrequency networking.

6.2 Data Preparation The information to be collected is used for parameter planning and subsequent data correctness check. Table 6-1 lists information to be collected in cells where IBCA is to be deployed. Table 6-1 Information to be collected in cells where IBCA is to be deployed

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No.

Information to Be Collected

Purpose

1

Alarms generated in the latest month for BTSs in these cells

Analyze the stability by cell.


16



No.

Information to Be Collected

Purpose

2

Engineering parametersa, such as the cell name, longitude and latitude, azimuth, BTS type, and MA, for these cells

Analyze the network topology and plan synchronization parameters.

3

Latest BSC configuration files in these cells

Check the correctness of engineering parameters.

4

Original statistics and historical data in 7 x 24 hours

Obtain the performance counters and operating status of the original network for subsequent comparison after IBCA is deployed.

5

TRX receive quality statistics and historical data in 7 x 24 hours

Obtain the value of RxQuality for subsequent value comparison after IBCA is deployed.

6

Statistics related to the interference matrixb of the original network in 7 x 24 hours

Plan the IBCA interference neighboring cells.

7

Traffic distribution in 7 x 24 hours (traffic in one week)

Set synchronization parameters.

NOTE

l a: Obtain the engineering parameters about these cells and compare these parameters with the latest configuration file to check the correctness of these parameters. If the engineering parameters are incomplete or some parameter values are incorrect, rectify them depending on the configuration file. If time permits, visit the BTSs on site to check whether the longitudes and latitudes of the BTSs and the azimuths of antennas are correct. If the GPS receiver has been installed and works properly, you can directly obtain the longitudes and latitudes from the GPS receiver. l b: Obtain the interference matrix in cells where IBCA is to be deployed for subsequent planning of IBCA interference neighboring cells. Deploying IBCA requires configuring IBCA interference neighboring cells. IBCA interference neighboring cells, however, are configured based on the actual interference information on the live network. You can analyze the actual interference information on the live network based on the interference matrix provided by the Nastar.

6.3 Network Planning The IBCA planning involves the planning of areas, channels, frequencies, hopping sequence numbers (HSNs), MAIOs, and IBCA interference cells. NOTE

The planning of the preceding information, except the channels, frequencies, and HSNs, can be implemented by professional tools.

l

Area planning The IBCA-enabled area uses a synchronous network. If its surrounding area uses an asynchronous network, the number of interference neighboring cells that can be configured for edge IBCA cells is limited. This affects the accuracy of calculated interference and network performance. To resolve this problem, a guard space is established between the IBCA-enabled area and its surrounding area. The guard space is enabled with IBCA and

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uses a synchronous network but its HSN is set to a value other than 0. Figure 6-1 shows the detailed area planning. Figure 6-1 Area planning

l

IBCA core area The IBCA-enabled synchronization network is used, and the HSN is 0.

l

Guard space The IBCA-enabled synchronous network reconstructed from the asynchronous network is used, and the HSN is not 0.

l

Asynchronous network The IBCA feature is disabled on the network.

l

Channel planning IBCA does not support dynamic PDCH conversion on the FH layer. Therefore, disable dynamic PDCH conversion on non-BCCH TRXs in the cell and configure the PDCHs of the original network on the BCCH TRX or TRXs of cells where the IBCA feature is disabled.

l

Frequency planning The frequency planning involves only frequencies on the TCH layer. When IBCA is used, the TCH layer must use the 1x3 or 1x1 frequency reuse pattern. – If the number of frequencies participating in the FH on the TCH layer is less than or equal to 12, use the 1x1 frequency reuse pattern to maximum the FH gains. – If the number of frequencies participating in the FH on the TCH layer is greater than 12, use the 1x3 frequency reuse pattern where frequencies are grouped in a nonsequential order. – To avoid adjacent-channel interference in a cell, frequencies in the 1x3 frequency reuse pattern must be grouped in non-sequential order.

l

HSN planning Cells in the same BTS must use the same HSN. If the HSN is set to 0, cyclic FH is used. If HSN is set to a value other than 0, random FH is used. For an IBCA-enabled cell, HSN 0 is recommended. The HSN is set to a value other than 0 only in the following scenarios: – The BTSs encounter frequent power-off, which affects the IBCA performance. – The BTSs cannot synchronize with each other on a synchronous network.

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– Guard space is established for the IBCA core area. The HSN remains unchanged after IBCA is deployed. – After IBCA is deployed, the handover performance deteriorates or the values of call drop-related counters drop significantly. l

MAIO planning The MAIO planning involves the following parameters: – TRXMAIO: MAIO of a channel in the TRX participating in the FH in a cell or subcell – MAIO1 – MAIO2 –… – MAIO24 Obtain MAIOs that can be used by the IBCA algorithm in each cell from the list of available MAIOs, and then assign an MAIO for TRXMAIO.

l

Planning of IBCA interference neighboring cells During the IBCA network planning, an IBCA interference neighboring cell must be configured for each serving cell. Before connecting a new call in the serving cell, the BSC collects information about the IBCA interference neighboring cell to calculate the specific interference. Based on the calculated interference, the BSC can assign an appropriate channel for the new call. To ensure the channel assignment effect, select the neighboring cells that have strong interference on the serving cell as the IBCA interference neighboring cell. A maximum of 24 IBCA interference neighboring cells can be configured. The larger the number of IBCA interference neighboring cells, the more accurate the calculated interference, and the better the network performance.

6.4 Deploying IBCA For details about how to activate, verify, and deactivate this feature, see Configuring IBCA.

6.5 Monitoring Table 6-2 lists the counters to be monitored after IBCA is deployed. Table 6-2 Counters to be monitored after IBCA is deployed

Issue 03 (2012-12-31)

Counter Description

Counter

Change Description

Call Drop Rate on TCH per cell (including Handover)

CELL.RATE.TCH.CALL.DROP.INCLUDE.H O

Increases by a maximum of 0.2%.

Call Drop Rate on TCH per cell (Excluding Handover)

CELL.RATE.TCH.CALL.DROP.EXCLUDE.H O



19



Counter Description

Counter

Change Description

Radio Handovers Success Rate

CELL.RD.HO.SUCC.RATE

Decreases by a maximum of 0.5%.

Congestion Rate on TCH (All Channels Busy)

CELL.KPI.TCH.CONGESTION.RATE


After IBCA is deployed, the proportion of HQIs increases. HQI reflects the Um interface receive quality. The Rx_QUALITY(UPLINK) and Rx_QUALITY(DOWNLINK) KPIs are used to measure proportions of receive quality levels 0 through 4 on the uplink and downlink, respectively.

6.6 Parameter Optimization Compare the KPIs before and after IBCA is deployed. If the KPIs do not change as expected in section 6.5 Monitoring, optimize the relevant parameters.

6.6.1 Call Drop Rate Find the top N cells with a high call drop rate and optimize configurations of these cells according to Table 6-3. Table 6-3 Call drop rate

Issue 03 (2012-12-31)

No.

Item

Solution

1

Identify the excessively configured or missed IBCA interference neighboring cells.

l If the IBCA interference neighboring cell fails to be configured, add it by referring to step 6 in "Feature Activation" in section 6.4 Deploying IBCA l If an IBCA neighboring cell that has no or less interference with the source cell is configured, delete the IBCA neighboring cell by referring to step 1 in "Deactivation" in section 6.4 Deploying IBCA

2

Identify the neighboring cells configured with the same frequency and BSIC.

Change the BSIC of the neighboring cells with the same frequency and BSIC.

3

Identify the neighboring cells configured with the same frequency and TSC.

Change the TSC of the interference neighboring cells with the same frequency and TSC.

4

Adjust the traffic busy threshold.

Decrease the traffic busy threshold for IBCA interference neighboring cells to increase the proportion of HR calls and relieve the interference.


20



No.

Item

Solution

5

Change the HSN of a cell.

l Before changing the HSN, set IBCASOFTBLKSWITCH to NO(No). l Change the HSNs of all cells in BTSs that serve the top N cells based on the HSN planning. l To change the HSN of a cell from 0 to a value other than 0, change the HSNs of other cells in the same BTS accordingly. This ensures that cells in the same BTS use the same HSN.

6

Adjust power control parameters.

Adjust power control parameters to improve the speech quality or reduce call drops, for example, adding the ULREXQUALADJFCTR and DLREXQUALADJF CTR parameters. For details on how to optimize the power control procedure, see Power Control Feature Parameter Description.

6.6.2 Handover Success Rate The procedure for optimizing the handover success rate is similar to that in section 6.6.1 Call Drop Rate. During the optimization of the handover success rate, before identifying the excessively configured or missed IBCA interference neighboring cells, check whether NCELLTYPE is set to HANDOVERANDIBCANCELL(Handover and IBCA Neighboring Cell).

6.6.3 Congestion Rate Find the top N cells with a high congestion rate and optimize configurations of these cells according to Table 6-4. Table 6-4 Procedure for optimizing the congestion rate

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No.

Item

Solution

1

Adjust the traffic busy threshold.

Set TCHAJFLAG to YES(Yes) and TCHBUSYTHRES to a low value.

2

Identify problems caused by the IBCA soft block threshold.

Decrease all the IBCA soft block thresholds by 1 to 2 dB. If the problems persist, set IBCASOFTBLKSWITCH to NO(No). NOTE The soft block thresholds of different services are specified by IBCAFRSOFTBLKTHRD, IBCAHRSOFTBLKTHRD, IBCAAFRSOFTBLKTHRD, IBCAAHRSOFTBLKTHRD, and IBCAWAFRSOFTBLKTHRD.


21



6.7 Troubleshooting None.

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22


7 Parameters

7

Parameters

Table 7-1 Parameter description Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

CONTHOMIN INTV

BSC6900

SET GCELLHOCT RL

GBFD-110601

HUAWEI I Handover

Meaning:Minim um interval between two consecutive handover decisions of an MS during the period from the time the BSC triggers a handover to the time the handover is successful. The BSC cannot make a handover decision during the minimum interval. To avoid frequent handovers in the cell, the BSC starts a timer after after triggering a handover. The BSC allows the MS to make another handover decision

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GBFD-510501

HUAWEI II Handover


23


Parameter ID

NE

7 Parameters

MML Command

Feature ID

Feature Name

Description (excluding emergency handover decisions) only after the timer expires. GUI Value Range:0~60 Unit:s Actual Value Range:0~60 Default Value:4

DLREXQUAL ADJFCTR

BSC6900

SET GCELLPWR3

GBFD-117601

HUAWEI III Power Control Algorithm

Meaning:This parameter specifies the downlink quality level factor multiplied by 10 during the calculation of the downlink power control step. The downlink quality level factor is a coefficient indicating how much the quality level is considered during the calculation of the downlink power control step. GUI Value Range:0~10 Unit:None Actual Value Range:0~10 Default Value:4

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24


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAAFRSOFTBLKTH RD

BSC6900

SET GCELLCHM GAD

GBFD-117002

IBCA (Interference Based Channel Allocation)

Meaning:Lowes t CIR allowed for AMR FR services. The CIR for an idle channel must be higher than this threshold. Otherwise, the idle channel cannot be allocated. In addition, the CIR of established calls cannot be lower than this threshold due to interference of newly established calls. GUI Value Range:0~23 Unit:dB Actual Value Range:0~23 Default Value:4

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25


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAAHRSOFTBLKTH RD

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Lowes t CIR allowed for AMR FR services. The carrier-tointerference ratio (CIR) for an idle channel must be higher than this threshold. Otherwise, the idle channel cannot be allocated. In addition, the CIR of established calls cannot be lower than this threshold due to interference newly established calls. GUI Value Range:0~23 Unit:dB Actual Value Range:0~23 Default Value: 10

IBCAALLOW ED

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Wheth er to enable the IBCA algorithm GUI Value Range:NO(No), YES(Yes) Unit:None Actual Value Range:NO, YES Default Value:NO(No)

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26


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAASSWAI TMEASURER PTTIME

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Lengt h of the timer for a new call to wait for the measurement report (MR) on the SDCCH when dynamic measurement of the BA2 list is enabled during assignment. If this parameter is set to 0, dynamic measurement of the BA2 list is not enabled during assignment. GUI Value Range:0~20 Unit:0.5s Actual Value Range:0~10 Default Value:4

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27


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCACALLIN FOFILTERLE N

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Upon receiving measurement reports (MRs), the network needs to filter the measurement values in consecutive MRs to indicate the actual radio environment. This parameter specifies the length for filtering path loss. The mapping between the GUI value and the actual value is as follows: Uplink TCHs: 480-7680; step: 480; unit: ms Uplink SDCCHs: 470-7520; step: 470; unit: ms GUI Value Range:1~16 Unit:ms Actual Value Range:1~16 Default Value: 10

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28


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCADLPAT HLOSSOFF

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Difference between uplink path loss and downlink path loss. This parameter is used to estimate the downlink path loss when the path loss cannot be directly obtained from the measurement report (MR). The downlink path loss can be calculated as follows: Downlink path loss = Uplink path loss + IBCA downlink path loss offset. This parameter should be set according to the combiner loss and the gain of dual-antenna receive of the BTS where the cell is allocated. That is, IBCA downlink path loss offset = Combiner loss of the BTS + Gain of 2-way receive diversity of the BTS(3 dB). GUI Value Range:0~63 Unit:dB Actual Value Range:0~63

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29


Parameter ID

NE

7 Parameters

MML Command

Feature ID

Feature Name

Description Default Value:7

IBCADYNCM EASURENCE LLALLOWED

BSC6900

ADD G2GNCELL MOD G2GNCELL

GBFD-117002


Meaning:Flag that indicates whether an IBCA neighboring cell is to be measured dynamically. This parameter is set to Yes if the information about a neighboring cell cannot be reported through measurement reports but the interference of the neighboring cell cannot be ignored. Otherwise, this parameter is set to No. This parameter is set to Yes for the neighboring cell with co-channel interference and the neighboring cells that cause interference, while this parameter is set to No for other neighboring cells. GUI Value Range:NO(No), YES(Yes) Unit:None Actual Value Range:NO, YES Default Value:NO(No)

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7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAEHOASS WAITMEASU RERPTTIME

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Lengt h of the timer for a call to measure the path loss in a neighboring cell with strong interference of the target cell. The BSC needs to measure the path loss before initiating an emergency handover to a target cell when dynamic measurement of the BA2 list is enabled during the emergency handover. If this parameter is set to 0, dynamic measurement of the BA2 list is not enabled in the emergency handover and "IBCAHOASS WAITMEASU RERPTTIME" is invalid. GUI Value Range:0~20 Unit:0.5s Actual Value Range:0~10 Default Value:0

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31


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAFREEBC CHCHANTHR SHOLD

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:If the number of idle TCHs on the BCCH TRX is smaller than this threshold, some calls on the BCCH TRX are handed over to non-BCCH TRXs. In this way, idle TCHs on the BCCH TRX are available and can be preferentially allocated to the calls handed over to the IBCA cells during an incoming BSC handover. GUI Value Range:0~3 Unit:None Actual Value Range:0~3 Default Value:2

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7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAFRSOFTBLKTH RD

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Lowes t CIR allowed for FR/EFR services. The CIR for an idle channel must be higher than this threshold. Otherwise, the idle channel cannot be allocated. In addition, the CIR of established calls cannot be lower than this threshold due to interference of newly established calls. GUI Value Range:0~23 Unit:dB Actual Value Range:0~23 Default Value: 10

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33


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAHOASS WAITMEASU RERPTTIME

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Lengt h of the timer for a call to wait for subsequent valid MRs after receiving the first valid MR containing the target cell information if dynamic measurement of the BA2 list is enabled during handover. If this parameter is set to 0, the call does not wait for subsequent MRs after receiving the first MR containing the target cell information. GUI Value Range:0~20 Unit:0.5s Actual Value Range:0~10 Default Value:2

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34


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAHRSOFTBLKTH RD

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:This parameter specifies the lowest C/I ratio allowed for the HR services. The C/I ratio of an idle channel should be higher than this threshold. Otherwise, the idle channel cannot be allocated. In addition, the C/I ratio of established calls cannot be lower than this threshold due to newly established calls. GUI Value Range:0~23 Unit:dB Actual Value Range:0~23 Default Value: 13

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35


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAICDMS WITCH

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:This parameter specifies whether the ICDM algorithm is enabled in the serving cell. The ICDM algorithm helps improve the precision of the estimation of the path loss between the serving cell and the IBCA neighboring cell, thus improving the efficiency of the IBCA algorithm. GUI Value Range:NO(No), YES(Yes) Unit:None Actual Value Range:NO, YES Default Value:YES (Yes)

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36


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAINBSCI NFORPTPRD

BSC6900

SET OTHSOFTPA RA

GBFD-117002


Meaning:Period of intra-BSC information interaction. The information is used to estimate IBCA CIR. The calls in the same cell under the BSC may be distributed on different CPUs. Therefore, the BSC needs to report the information about calls and channel occupation status in the same IBCA neighboring cell group on each CPU to the MCP XPU at a period specified by this parameter. GUI Value Range: 100~6000 Unit:ms Actual Value Range: 100~6000 Default Value: 2000

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37


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAINITPC RXLEVDLOF FSET

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Adds a specified offset to the downlink target receive level when power control algorithm III is used to calculate the initial transmit power of a BTS in the IBCA function. GUI Value Range:0~63 Unit:dB Actual Value Range:0~63 Default Value:0

IBCAINITPC RXLEVULOF FSET

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Adds a specified offset to the uplink target receive level when power control algorithm III is used to calculate the initial transmit power of an MS in the IBCA function. GUI Value Range:0~63 Unit:dB Actual Value Range:0~63 Default Value:0

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7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAINITPC RXQUALDLO FFSET

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Adds a specified offset to the downlink target receive quality when power control algorithm III is used to calculate the initial transmit power of a BTS in the IBCA function. GUI Value Range:0~22 Unit:dB Actual Value Range:0~22 Default Value:0

IBCAINITPC RXQUALULO FFSET

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Adds a specified offset to the uplink target receive quality when power control algorithm III is used to calculate the initial transmit power of an MS in the IBCA function. GUI Value Range:0~22 Unit:dB Actual Value Range:0~22 Default Value:0

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39


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAMAIOUS MTD

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Metho d for a timeslot to select MAIO during IBCA estimation. If this parameter is set to 0(Max. optimized MAIO), a timeslot selects the optimized MAIO being evaluated. If this parameter is set to 1 (Randomization MAIO), a timeslot randomly selects a MAIO. GUI Value Range:0(Max. optimized MAIO), 1 (Randomization MAIO) Unit:None Actual Value Range:0, 1 Default Value:0 (Max. optimized MAIO)

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40


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAMAXIN TFSRCNUM

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:The N established calls that have the strongest interference with newly established calls during the assessment of the IBCA interference. GUI Value Range:5~40 Unit:None Actual Value Range:5~40 Default Value: 20

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41


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCANCELLP ATHLOSSEST IMATE

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:This parameter is used to estimate the receive level of the IBCA neighboring cell that is not measured. When the information about less than six neighboring cells is reported in N (N is specified by IBCA Non Measurement Ncell Stat. Num) consecutive measurement reports, or the number of reported neighboring cells is smaller than the number of configured neighboring cells, the receive level of the IBCA neighboring cell that is not reported is estimated. This estimated value is specified by this parameter. GUI Value Range:0~63 Unit:dB Actual Value Range:0~63 Default Value:0

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42


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCANHOASS WAITMEASU RERPTTIME

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Timer for a call to measure the path loss in the neighboring cell with strong interference of the target cell. The call to be handed over needs to measure the path loss before initiating the handover to the target cell when dynamic measurement of the BA2 list is enabled during the normal handover. If this parameter is set to 0, dynamic measurement of the BA2 list is not enabled in the normal handover and "IBCAHOASS WAITMEASU RERPTTIME" is invalid.. GUI Value Range:0~20 Unit:0.5s Actual Value Range:0~10 Default Value:5

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43


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCANONME ANCELLSTA TNUM

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:This parameter is used to estimate the number of measurement reports when the receive level of the IBCA neighboring cell is not measured. When the information about less than six neighboring cells is reported in N (N is specified by this parameter) consecutive measurement reports, or the number of reported neighboring cells is smaller than the number of configured neighboring cells, the receive level of the IBCA neighboring cell that is not reported is estimated. GUI Value Range:0~16 Unit:None Actual Value Range:0~16 Default Value:4

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44


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAOUTBSC INFORPTPRD

BSC6900

SET OTHSOFTPA RA

GBFD-117002


Meaning:Period of inter-BSC information interaction. The information is used to estimate IBCA CIR. If the IBCA neighboring group includes an external cell, the information about calls and channel occupation status in this cell needs to be reported to the corresponding BSC over an inter-BSC link at a period specified by this parameter. GUI Value Range: 100~6000 Unit:ms Actual Value Range: 100~6000 Default Value: 4000

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45


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAPATHL OSSOFF

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Path loss offset. It is used to calculate the path loss between an MS and a neighboring cell if the path loss cannot be obtained from the measurement reports. The formula is as follows: Path loss between an MS and a neighboring cell = Path loss between the MS and the serving cell + Value of this parameter. It is recommended that this parameter be set to 15 for neighboring cells at layer 1 and to 25 for neighboring cells at other layers. GUI Value Range:0~50 Unit:dB Actual Value Range:0~50 Default Value: 15

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46


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAPLFILT FACTOR

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:This parameter specifies the impact of the history path when the path loss is calculated through the ICDM algorithm. The impact of the history path loss is proportional to the filter coefficient. GUI Value Range:0~10 Unit:None Actual Value Range:0~10 Default Value:6

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47


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCARXLEV OFFSET

BSC6900

ADD G2GNCELL

GBFD-117002


Meaning:Unme asured receive level of IBCA neighboring cells. If the number of neighboring cells reported in consecutive N measurement reports (N is specified by "IBCANONME ANCELLSTAT NUM") is smaller than that of the actually configured neighboring cells, this parameter is used to estimate the unmeasured receive level of IBCA neighboring cells. The estimated value is equal to the value of "IBCANCELLP ATHLOSSESTI MATE" or the signal level of the unmeasured IBCA neighboring cells is the measured signal level of the neighboring cells (including non-IBCA neighboring cells) minus the value of "IBCARXLEV OFFSET".

MOD G2GNCELL

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48


Parameter ID

NE

7 Parameters

MML Command

Feature ID

Feature Name

Description GUI Value Range:0~63 Unit:dB Actual Value Range:0~63 Default Value:4

IBCASCELLP ATHLOSS

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:This parameter specifies the path loss between the MS and the serving cell when the path loss cannot be directly obtained from the measurement reports. GUI Value Range:0~160 Unit:dB Actual Value Range:0~160 Default Value: 110

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49


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCASOFTBL KSWITCH

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Wheth er to deny the access of a call when none of the MAIO evaluation results meets the C/I ratio requirement of the call during channel assignment. GUI Value Range:NO(No), YES(Yes) Unit:None Actual Value Range:NO, YES Default Value:NO(No)

IBCATARGE TCIRTHRSH

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Thresh old for a MAIO access. If "IBCAMAIOU SMTD" is set to 1 (Randomization MAIO) and the value of the MAIO CIR is higher than this threshold, this MAIO can be allocated to calls. GUI Value Range:0~63 Unit:None Actual Value Range:0~63 Default Value: 20

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50


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAUSRDY NCMEASURE NCELL

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:Wheth er the IBCA neighboring cells of the serving cell are dynamically measured. The BSC obtains the downlink level of the IBCA neighboring cells from the measurement reports reported by the MS. Based on the downlink level, the BSC can calculate the path loss between the IBCA neighboring cell and the MS. Then, based on the path loss, the BSC calculates the strength of interfering signals. On the dual-band network, the IBCA neighboring cell causes interference to the calls in the serving cell, but the receive level in the IBCA neighboring cell may not be the strongest one. Therefore, information about the downlink receive level of the IBCA

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51


Parameter ID

NE

7 Parameters

MML Command

Feature ID

Feature Name

Description neighboring cell may not be contained in the measurement reports. In this case, the system information 5, 5bis, and 5ter are forcibly modified during the assignment or handover to force the MS to report the downlink receive level of the IBCA neighboring cells. GUI Value Range:NO(No), YES(Yes) Unit:None Actual Value Range:NO, YES Default Value:NO(No)

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52


7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IBCAWAFRSOFTBLKTH RD

BSC6900

SET GCELLCHM GAD

GBFD-117002


Meaning:The lowest C/I ratio that can be tolerated by IBCA WAMR FR. The C/I ratio of an idle channel must be larger than this parameter. Otherwise, it cannot be assigned. In addition, the system does not allow a newlyestablished call causing the C/I ratio of existing calls to be lower than this parameter. GUI Value Range:0~23 Unit:dB Actual Value Range:0~23 Default Value:5

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7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

INTERFPRIA LLOW

BSC6900

SET GCELLCHM GAD

GBFD-111005

Enhanced Channel Assignment Algorithm

Meaning:Wheth er to consider interference priorities during channel assignment. If this parameter is set to YES, the interference priority in the channel priority is valid. If this parameter is set to NO, the interference priority in the channel priority is invalid. GUI Value Range:NO(No), YES(Yes) Unit:None Actual Value Range:NO, YES Default Value:YES (Yes)

MAIO1

BSC6900

SET GCELLMAIO PLAN

GBFD-117002


Meaning:First planned MAIO among available MAIOs. GUI Value Range:0~63 Unit:None Actual Value Range:0~63 Default Value:None

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7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

MAIO2

BSC6900

SET GCELLMAIO PLAN

GBFD-117002


Meaning:Secon d planned MAIO among available MAIOs. GUI Value Range:0~63 Unit:None Actual Value Range:0~63 Default Value:None

MAIO24

BSC6900

SET GCELLMAIO PLAN

GBFD-117002


Meaning:Twent y-fourth planned MAIO among available MAIOs. GUI Value Range:0~63 Unit:None Actual Value Range:0~63 Default Value:None

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7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

NCELLTYPE

BSC6900

ADD G2GNCELL

GBFD-117002


Meaning:The parameter indicates whether the neighboring cell is a handover neighboring cell, an IBCA neighboring cell, or a handover and IBCA neighboring cell of the serving cell. If the parameter is set to HANDOVERN CELL (Handover Neighboring Cell), the neighboring cell is the handover neighboring cell but not the IBCA neighboring cell of the serving cell. If the parameter is set to IBCANCELL (IBCA Neighboring Cell), the neighboring cell is the IBCA neighboring cell but not the handover neighboring cell of the serving cell. If the parameter is set to HANDOVERA NDIBCANCEL L(Handover and IBCA Neighboring

MOD G2GNCELL

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Parameter ID

NE

7 Parameters

MML Command

Feature ID

Feature Name

Description Cell), the neighboring cell is the handover neighboring cell and IBCA neighboring cell of the serving cell. IBCA neighboring cells are some neighboring cells of a serving cell with its IBCA algorithm enabled. There is co-channel or adjacentchannel interference between the IBCA neighboring cells and the serving cell. Handover neighboring cells are candidate target cells of the serving cell during a handover. GUI Value Range:HANDO VERNCELL (Handover Neighboring Cell), IBCANCELL (IBCA Neighboring Cell), HANDOVERA NDIBCANCEL L(Handover and IBCA Neighboring Cell) Unit:None

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Parameter ID

NE

7 Parameters

MML Command

Feature ID

Feature Name

Description Actual Value Range:HANDO VERNCELL, IBCANCELL, HANDOVERA NDIBCANCEL L Default Value:HANDO VERNCELL (Handover Neighboring Cell)

NEWURGHO MININTV

BSC6900

SET GCELLHOCT RL

GBFD-110601 GBFD-510501

HUAWEI I Handover HUAWEI II Handover

Meaning:Minim um interval between two consecutive emergency handovers performed by an MS. During this interval, no emergency handover is allowed. GUI Value Range:0~60 Unit:s Actual Value Range:0~60 Default Value:4

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7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TCHAJFLAG

BSC6900

SET GTRXDEV

GBFD-113402

Dynamic Adjustment Between FR and HR

Meaning:Wheth er to allow the cell to dynamically change a channel from full rate to half rate or from half rate to full rate. If this parameter is set to Yes, the conversion is allowed; if the parameter is set to No, the conversion is not allowed and the changed channel is restored to the previous rate mode. In addition, this parameter helps to determine the channel assignment priority. The channels in a TRX that does not allow dynamic adjustment take priority.

GBFD-115830

VAMOS

GUI Value Range:NO(No), YES(Yes) Unit:None Actual Value Range:NO, YES Default Value:NO(No)

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7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TCHBUSYTH RES

BSC6900

SET GCELLCHM GAD

GBFD-111005

Enhanced Channel Assignment Algorithm

Meaning:If the current channel seizure ratio reaches or exceeds this value, the halfrate TCH is assigned preferentially; otherwise, the full-rate TCH is assigned preferentially. GUI Value Range:0~100 Unit:% Actual Value Range:0~100 Default Value: 60

TRXMAIO

BSC6900

SET GTRXCHANH OP

GBFD-113701

Frequency Hopping (RF hopping baseband hopping)

Meaning:Mobil e allocation index offset (MAIO) of the channel in the TRX GUI Value Range:0~63 Unit:None Actual Value Range:0~63 Default Value:0

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7 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ULREXQUAL ADJFCTR

BSC6900

SET GCELLPWR3

GBFD-117601

HUAWEI III Power Control Algorithm

Meaning:This parameter specifies the uplink quality level factor multiplied by 10 during the calculation of the uplink power control step. The uplink quality level factor is a coefficient indicating how much the quality level is considered during the calculation of the uplink power control step. GUI Value Range:0~10 Unit:None Actual Value Range:0~10 Default Value:4

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8 Counters

8

Counters

There are no specific counters associated with this feature.

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9 Glossary

9

Glossary

For the acronyms, abbreviations, terms, and definitions, see the Glossary.

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10 Reference Documents

10

Reference Documents

1.

3GPP TS 45.002, "Multiplexing and multiple access on the radio path"

2.

3GPP TS 45.008, " Radio subsystem link control"

3.

3GPP TS 08.58 Base Station Controller - Base Transceiver Station(BSC - BTS) interface; Layer 3 specification

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IBCA(GBSS14.0_03).pdf

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