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Root Cause Analysis for KPI decrease
Issue
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 When a newer version of the software is released, the first document corresponding to the new software version has the document version starting from 01.)—如之前提供有报告,后续有更新,需要标出版本和变化点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.,
Ltd
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Copyright © Huawei Technologies Co., Ltd. 2010. 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 expressed 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 the warranty of any kind, express or implied.
Huawei Technologies Co., Ltd.
Address: Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Web site: http://www.huawei.com
Email: [email protected]
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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
Issue 01 (2015-03-31) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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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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Root Cause Analysis for KPI decrease 4 Root Cause
4 Problem Description
The downlink quality of one site was decreased after excute and rollback the re-farming script
Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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Root Cause Analysis for KPI decrease 4 Root Cause
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
Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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Root Cause Analysis for KPI decrease 4 Root Cause
And check the operation log,
Excute:
Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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Root Cause Analysis for KPI decrease 4 Root Cause
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.
Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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Root Cause Analysis for KPI decrease 4 Root Cause
The traffic of these cells was increased since 17:00, 14th Apr.
The totall HR rate didn’t change
Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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Root Cause Analysis for KPI decrease 4 Root Cause
The AMR traffic didn’t changed much.
Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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Root Cause Analysis for KPI decrease 4 Root Cause
And the access request time,there was a peak, and then recover.but the quality didn’t recover
Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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Root Cause Analysis for KPI decrease 4 Root Cause
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
Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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Root Cause Analysis for KPI decrease 4 Root Cause
And the traffic trend was the same
Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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Root Cause Analysis for KPI decrease 4 Root Cause
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.
Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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Root Cause Analysis for KPI decrease 4 Root Cause
7 Corrective Action
.
7.1 Workaround;
7.2 Solution
Issue 01 (2015-03-312010-07-02) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,
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