Gsm bss network kpi (sdcch congestion Rate) Optimization Manual



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03 GSM BSS Network KPI SDCCH Congestion






GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual

INTERNAL




BOM Code




Product Name

GSM BSC

Confidentiality Level

INTERNAL

Product Version

V1.1

Compiling Department




Document Version

Total 31 pages

GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual


(For internal use only)



Prepared by

GSM&UMTS Network Performance Research Department
Yang Chunjie

Date

2008-05-19

Reviewed by




Date




Reviewed by




Date




>Approved by




Date





Huawei Technologies Co., Ltd.


All rights reserved
Revision Record

Date

Revision Version

Description

Author

2008-05-19

V1.0

Draft completed

Yang Chunjie 00119951

2008-06-02

V1.0

Adjust the sequence of problem location and add some suggestions of adjusting the related parameters affecting SDCCH congestion rate according to the advices of the experts in our team and the experts of network optimization and planning.

Yang Chunjie 00119951

References

Number

Reference

Author

Date

1

Guide to Optimization of SDCCH Congestion Rate

Wang Weiji, Yang Haiquan

2006-12-20

2

Baseline Specification of GSM BSS Network KPI (SDCCH Congestion Rate)

Wu Zhen

2007-04-09

Contents

1 Principles of SDCCH Congestion Rate 5
1.1 Definition 5
1.2 SDCCH Seizure 6
1.3 Signaling Procedure and Measurement Points 6
2 Factors of SDCCH Congestion Rate in GSM 6
2.1 Congestion Caused by Faults on Equipment or Transmission 6
2.2 Congestion Caused by Insufficient Signaling Resources 7
2.3 Congestion Caused by Improper Data Configuration 7
2.4 Congestion Caused by Interference 7
3 Optimazation Method of SDCCH Congestion 7
3.1 Analysis Procedure of SDCCH Congestion Rate 7
3.2 Optimazation Method of SDCCH Congestion Rate 9
3.2.1 Checking Hardware 9
3.2.2 Checking Channel Configuration 9
3.2.3 Checking Data Configuration 11
3.2.4 Checking the Um Interface 12
4 Test Method 13
5 Case Analysis of SDCCH Congestion Rate 13
5.1 Congestion Caused by Improper Configuration of Power 13
5.2 SDCCH Congesiton Caused by Improper Configuration of LAC 14
6 Feedbacks on High SDCCH Congestion Rate 15
Appendix Relevant Traffic Counters to BSC6000 SDCCH Congestion Rate 15



SDCCH Congestion Rate Optimization Manual
Keywords: SDCCH Congestion Rate
Abstract: This document introduces the definition and optimization method of SDCCH congestion rate.
Abbreviations:

Abbreviation

Full Spelling

SDCCH

Stand-alone Dedicated Control Channel


1Principles of SDCCH Congestion Rate


SDCCH congestion rate is one of the important counters that indicate accessibility in circuit service. This counter provides the ratio of failed SDCCH seizures due to busy SDCCH to the total requests for the SDCCH. SDCCH congestion rate indicates the failed requests for the SDCCH for various reasons. SDCCH congestion rate also indicates the status of the SDCCH resource utilization.

1.1Definition


The Huawei definition and formula of SDCCH congestion rate are as follows:

  • Definition:

Ratio of failed SDCCH seizures due to busy SDCCH to the total requests for the SDCCH

  • Formula:

SDCCH congestion rate = Failed SDCCH seizures due to busy SDCCH/Total requests for the SDCCH x 100%
Failed SDCCH Seizures due to Busy SDCCH = [Failed Immediate Assignment due to Busy Channels or Failed Configurations (SDCCH)] + [Failed Internal Inter-cell Handovers (No Channel Available) (SDCCH)] + [Failed Incoming Internal Inter-cell Handovers (No Channel Available) (SDCCH)] + [Failed Incoming External Handovers (No Channel Available) (SDCCH)]

1.2SDCCH Seizure


The requests for the SDCCH in GSM are mainly made in the following two procedures:

  1. The procedure for requesting the SDCCH for services such as point-to-point calls, location updating (only SDCCH), call re-establishment, or short messages;

  2. he procedure of SDCCH handovers (including both the intra-BSC and inter-BSC handovers)

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