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Analysis Report for CDR&HOSR Problem

Issue 01

Date 2014-08-05

HUAWEI TECHNOLOGIES CO., LTD.

Issue 01 (2010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,

Ltd

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Issue 01 (2010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,

Ltd

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Root Cause Analysis for xxx Contents

About This Document

Trouble Ticket Number

3874321

Prepared by Lu Xinhui 00169544

Approved by

Approval Date

Issue 01 (2010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,

Ltd

iii

Root Cause Analysis for xxx Contents

Contents

About This Document.......................................................................iii

1 Basic Information........................................................................1-1

2 Problem Description...................................................................2-1

3 Problem Analysis........................................................................3-1

4 Root Cause.................................................................................4-1

5 Corrective Action........................................................................5-15.1 Workaround....................................................................................................................................................5-1

5.2 Solution...........................................................................................................................................................5-1

6 Preventive Action..........................................................................................6-1

Issue 01 (2010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,

Ltd

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1 Basic Information

Product Name Version

BSC6900 V900R014ENGC00SPH562

2 Problem Description

CDR and HOSR of many BSC were degraded on Dec 6. It’s needed to analysis the root cause.

3 Problem Analysis

3.1 Counter AnalysisCDR of all BSCs was degraded on Nov 12.

CS Traffic kept stable on Dec 6.

PS traffic kept stable.

UL BQ HOSR was degraded obviously, but DL BQ HOSR and Better Cell HSOR degraded slightly. UL BQ handover requests was increased sharply. Handover requests of other type of handover kept stable.

Uplink RxQual was degraded on Dec 6, but downlink RxQual kept stable.

Ratio of interference band level 3,4 and 5 was increased sharply on Dec 6. This proved that the interference increased.

The trend of UL RxQual 6&7% is not consistent with CS traffic. We suspicious that there was external interference.

3.2 Operations AnalysisBCPT01:

The operation log has been checked, there is no related operation on Dec 6.

4 Root cause

CDR and HOSR were degraded by uplink RxQua degrading. Uplink Rxquality was degraded. We suspicious that there is external interference.

5 Solution

Check the interference source.