2G3G Neighboring Cell Automatic Optimization(GBSS13.0_01)

2G/3G Neighboring Cell Automatic Optimization GBSS13.0

Feature Parameter Description

Issue 01

Date 2011-03-31

HUAWEI TECHNOLOGIES CO., LTD.

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GSM BSS

2G/3G Neighboring Cell Automatic Optimization Contents

Issue 01 (2011-03-31) Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd.

i

Contents

1 Introduction ................................................................................................................................ 1-1

1.1 Scope ............................................................................................................................................ 1-1

1.2 Intended Audience......................................................................................................................... 1-1

1.3 Change History .............................................................................................................................. 1-1

2 Overview...................................................................................................................................... 2-1

3 Technical Description .............................................................................................................. 3-1

3.1 Network Topology .......................................................................................................................... 3-1

3.2 Task Creation ................................................................................................................................ 3-1

3.3 Neighboring Cell Analyzing Algorithm ........................................................................................... 3-1

4 Parameters.................................................................................................................................. 4-1

5 Counters ...................................................................................................................................... 5-1

6 Glossary ...................................................................................................................................... 6-1

7 Reference Documents ............................................................................................................. 7-1

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 1 Introduction



1-1

1 Introduction

1.1 Scope

This document describes the benefits of the 2G/3G Neighboring Cell Automatic Optimization feature and the principle of implementing this feature in Huawei GSM BSS.

The feature involved is GBFD-510901 2G/3G Neighboring Cell Automatic Optimization.

1.2 Intended Audience

This document is intended for:

Personnel who need to understand the 2G/3G Neighboring Cell Automatic Optimization feature.

Personnel who work with Huawei products

1.3 Change History

This section provides information on the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change: refers to the change in the 2G/3G Neighboring Cell Automatic Optimization feature of a specific product version.

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

Document Issues

The document issues are as follows:

01 (2011-03-31)

Draft A (2011-01-15)

01 (2011-03-31)

This is the first release of GBSS13.0.

Compared with issue draft A (2011-01-15) of GBSS13.0, issue 01 (2011-03-31) of GBSS13.0 has no change.

Draft A (2011-01-15)

This is the draft release of GBSS13.0.

Compared with issue 01 (2010-06-30) of GBSS12.0, issue Draft A (2011-01-15) of GBSS13.0 has no change.

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 2 Overview



2-1

2 Overview

The 2G network must be compatible with the 3G network to support the roaming and handover between GSM and UMTS. Operators need to provide continuous and high-quality services in the boundary of different systems to avoid call drops of moving MSs.

In traditional conditions, inter-RAT neighboring cells are configured on the basis of drive tests and analysis, which is time-consuming and labor-consuming, and the test result is incomprehensive owning to the limitations of drive tests. A tool is required to check the inter-RAT neighboring cell configuration automatically based on the data analysis to improve the efficiency and accuracy.

Together with the Nastar network optimization tool, Huawei GSM BSS can analyze the 2G/3G neighboring cell configuration based on numerous measurement reports (MRs) from MSs, show the analysis result on the map, and find out missing or redundant 3G neighboring cells for the GSM serving cell.

Configuring appropriate 3G neighboring cells according to the Nastar analyzing result helps to improve the inter-RAT handover success rate and reduce the call drop rate, thus improving the GSM network quality and the user experience.

This document introduces the 2G/3G Neighboring Cell Automatic Optimization feature from the following aspects:

Network topology

Task creation

Neighboring cell analyzing algorithm.

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 3 Technical Description



3-1

3 Technical Description

3.1 Network Topology

This feature should be supported by the MS, BSC, M2000, and Nastar. To implement this feature, create a corresponding task on the Nastar. Figure 3-1shows the network topology of this feature.

Figure 3-1 Network topology of 2G/3G neighboring cell automatic optimization

NodeB

MS

BTS BSC

RNC Nastar

iManager M2000

3.2 Task Creation

The procedure for creating a 2G/3G neighboring cell automatic optimization task is as follows:

1. Create an end-to-end task on the Nastar and set the following basic information: task name, OSS name, NE name, NE type, start time for the measurement, end time for the measurement, MEASPERIOD, and scrambling code of the 3G neighboring cell to be measured, and NcellInterFLevelThres0 to NcellInterFLevelThres7.

2. The Nastar sends the task to the M2000, the M2000 then sends the task information to the BSC through a MML command. After receiving the command, the BSC performs the measurement and generate a result.

3. The BSC updates the BA2 one time in each measurement period. The BSC adds UMTS cells (frequency + scrambling code) into the BA2 (the number of newly-added cells is the same as the measurement step), and then sends the updated BA2 to MSs through System Information (SI). Then, MSs report the level of 3G neighboring cells through MRs.

4. The BSC collects MRs from MSs, and then sends the data to the M2000.

5. The Nastar obtains the measurement files, configuration data, and counter values from the M2000, and then provides the optimization suggestion after analysis.

6. The 2G/3G neighboring cell analysis results are shown in the map directly. Together with the engineering parameters, the analysis result helps the network optimization engineers figuring out the missing and abundant 2G/3G neighboring cells.

3.3 Neighboring Cell Analyzing Algorithm

Neighboring cell analyzing algorithm is used for determining missing or abundant cells.

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 3 Technical Description



3-2

The algorithm grades and sorts 3G neighboring cells on the basis of the absolute level, relative level, and number of MRs of the 2G serving cell and 3G neighboring cells. A greater score indicates a higher priority. Then, the algorithm determines the missing or redundant cells according to the priority.

The algorithm for determining the missing cell is as follows:

If a cell is not configured as the neighboring cell but the priority of the cell is greater than the advised number of neighboring cells, the cell is considered as the missing neighboring cell.

The algorithm for determining the redundant cell is as follows:

If a cell is configured as the neighboring cell but the priority of the cell is smaller than the advised number of neighboring cells, the cell is considered as the redundant neighboring cell.

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 4 Parameters



4-1

4 Parameters

Table 4-1 Parameter description

Parameter ID NE MML Command Feature ID Feature Name Description

MEASPERIOD BSC6900 ADD GNRNC(Mandatory)

MOD GNRNC(Mandatory)

GBFD-511103

GBFD-511402

GSM and WCDMA Load Balancing Based on Iur-g

Radio Resource Reserved Handover Between GSM/TD-SCDMA Based on Iur-g

Meaning: Common measurement period

GUI Value Range: 1~5

Actual Value Range: 1~5

Default Value: 3

Unit: s

NcellInterFLevelThres0

BSC6900 SET OTHSOFTPARA(Optional)

GBFD-510901 GSM and UMTS Neighboring Cell Automatic Optimization

Meaning: Neighboring cell interference level threshold 0. The actual value of this parameter is equal to the GUI value minus 64.


Actual Value Range: -64~63

Default Value: 0

Unit: dB

NcellInterFLevelThres7

BSC6900 SET OTHSOFTPARA(Optional)

GBFD-510901 GSM and UMTS Neighboring Cell Automatic Optimization

Meaning: Neighboring cell interference level threshold 7. The actual value of this parameter is equal to the GUI value minus 64.


Actual Value Range: -64~63

Default Value: 80

Unit: dB

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 5 Counters



5-1

5 Counters

Table 5-1 Counter description

Counter ID Counter Name Counter Description Feature ID Feature Name

1278272417 CELL.NCELL.LEV S360:Strength of Signals in Neighbor Cells

GBFD-510901 2G/3G Neighboring Cell Automatic Optimization

1278272418 CELL.NCELL.MR.NUM

S361:MRs of Neighbor Cells GBFD-510901 2G/3G Neighboring Cell Automatic Optimization

1278272419 CELL.NCELL.LEV.AVR

AS360:Mean Strength of Signals in Neighbor Cells


1278272420 CELL.SCELL.LEV S362:Strength of Signals in Serving Cells


1278272421 CELL.SCELL.NCELL.LEV.LESS.THRES1.MR.NUM

S363:Number of MRs in Which the Signal Strength Difference Between the Serving Cell and the Neighbor Cell Is Smaller Than the Neighbor Cell Interference Level Threshold 1


1278272422 CELL.SCELL.NCELL.LEV.GT.THRES1.MR.NUM

S364:Number of MRs in Which the Signal Strength Difference Between the Serving Cell and the Neighbor Cell Is Greater Than the Neighbor Cell Interference Level Threshold 1








1278272425 CELL.SCELL.NCELL.LEV.GT.THRES4.

S367:Number of MRs in Which the Signal Strength


GSM BSS




5-2


MR.NUM Difference Between the Serving Cell and the Neighbor Cell Is Greater Than the Neighbor Cell Interference Level Threshold 4










1278272429 CELL.SCELL.NCELL.DIFF.LEV.AVR

AS362:Mean Signal Strength Difference Between Serving Cell and Neighbor Cell


1278272430 CELL.NCELL.SCELL.LEV.GT.RTHRES.MR.NUM

S371:Measurement Reports with Signal Strength Difference Between Neighbor Cell and Serving Cell Greater Than Relative Level Threshold


1278272431 CELL.NCELL.LEV.GT.ABS.THRES.MR.NUM

S372:Measurement Reports with Signal Strength of Neighbor Cell Greater Than Absolute Level Threshold


1278272445 CELL.NCELL.LEVEL.0

S386:Number of MRs on Competitive Cell (Receive Level Rank 0)


GSM BSS




5-3























1278272453 CELL.SCELL.NCELL.LEV.LESS.THRES0.MR.NUM

S394:Number of MRs in Which the Signal Strength Difference Between the Serving Cell and the Neighbor Cell Is Smaller Than the Neighbor Cell Interference Level Threshold 0


GSM BSS

2G/3G Neighboring Cell Automatic Optimization 6 Glossary



6-1

6 Glossary

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

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 7 Reference Documents



7-1

7 Reference Documents

[1] BSC6900 Feature List

[2] BSC6900 Basic Feature Description

[3] BSC6900 GSM Parameter Reference

[4] BSC6900 GSM MML Command Reference

1 Introduction1.1 Scope1.2 Intended Audience1.3 Change HistoryDocument Issues01 (2011-03-31)Draft A (2011-01-15)

2 Overview3 Technical Description3.1 Network TopologyFigure 3-1 Network topology of 2G/3G neighboring cell automatic optimization

3.2 Task Creation1. Create an end-to-end task on the Nastar and set the following basic information: task name, OSS name, NE name, NE type, start time for the measurement, end time for the measurement, MEASPERIOD, and scrambling code of the 3G neighboring cell to be m...2. The Nastar sends the task to the M2000, the M2000 then sends the task information to the BSC through a MML command. After receiving the command, the BSC performs the measurement and generate a result.3. The BSC updates the BA2 one time in each measurement period. The BSC adds UMTS cells (frequency + scrambling code) into the BA2 (the number of newly-added cells is the same as the measurement step), and then sends the updated BA2 to MSs through Sys...4. The BSC collects MRs from MSs, and then sends the data to the M2000.5. The Nastar obtains the measurement files, configuration data, and counter values from the M2000, and then provides the optimization suggestion after analysis.6. The 2G/3G neighboring cell analysis results are shown in the map directly. Together with the engineering parameters, the analysis result helps the network optimization engineers figuring out the missing and abundant 2G/3G neighboring cells.

3.3 Neighboring Cell Analyzing Algorithm

4 ParametersTable 4-1 Parameter description

5 CountersTable 5-1 Counter description

6 Glossary7 Reference Documents[1] BSC6900 Feature List[2] BSC6900 Basic Feature Description[3] BSC6900 GSM Parameter Reference[4] BSC6900 GSM MML Command Reference