SR 5000917 Root Cause Analysis for DL Quality Decrease

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Root Cause Analysis for KPI decrease

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01 (Document version. The document version number consists of two digits. The version number of the first release is 01. If the software version remains unchanged, each time the document is updated, the last digit of the document version number is increased by 1. When a newer version of the software is released, the first document corresponding to the new software version has the document version starting from 01.)—如之前提供有报告，后续有更新，需要标出版本和变化点

Date 2015-03-31

HUAWEI TECHNOLOGIES CO., LTD.

Issue 01 (2015-03-31) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,

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Root Cause Analysis for KPI decrease Contents

1 About This Document

Trouble Ticket Number

Prepared by Zhoudong 00165922

Approved by

Approval Date


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Root Cause Analysis for KPI decrease Contents

2 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


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Root Cause Analysis for KPI decrease 4 Root Cause

3 Basic Information

Provide the information about the solution/product and the version in which the problem was found.

Example:

Product Name Version

BSC6900

Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,

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4 Problem Description

The downlink quality of one site was decreased after excute and rollback the re-farming script


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5 Problem Analysis

L1 did the re-farming script on 23:00 Pm,13th Apr. and rollback on 1:00 Am,14th Apr. and the downlink quality was decreased since then.

5.1 Operation analyse Compare the config file before and after the operation, no related parameter was changed


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And check the operation log,

Excute:


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Rollback

And set the BA to CELL2GBA2TAG afterwise.

5.2 Alarm analyseCheck the alarm, no related alarm on these cells.

5.3 Performance analyseAnd compare the coverage level and quality before and after the operation, the downlink quality was decreased.

Before,on 13th Apr.

After,on14th Apr.


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The traffic of these cells was increased since 17:00, 14th Apr.

The totall HR rate didn’t change


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The AMR traffic didn’t changed much.


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And the access request time,there was a peak, and then recover.but the quality didn’t recover


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And we check the other cells of the BSC

The DL quality was also decreased

And if we try to find the top cell,we can also find cells decrease in the DL quality


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And the traffic trend was the same


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So, we can see that the BSC DL quality was decreased, and the cells didn’t do the operation was also decreased. So we can say the decrease is not related with the operation.

6 Root Cause

The decrease is not related with the operation, it a normal BSC wave.


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7 Corrective Action

.

7.1 Workaround;

7.2 Solution


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SR 5000917 Root Cause Analysis for DL Quality Decrease

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