8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 1/19

Doc. Code (deleted as required)

Root Cause Analysis for KPI

decrease

Issue

011  (Document version. The document version number consists of two digits. Theversion 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 isincreased 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 When a newer version of the software is released, the first document corresponding to the new software version has the document version starting from 01.!如之前提供有报告，后续有更新，需要标出版本和变化点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

Issue 01 (2015-03-31) Huawei Proprietary and Confidential

  Copyright © Huawei e!hnologies Co"#

$td

1

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 2/19

HUA!I "!CH#$%$&I!' C$.( %"D.

Co)yri*+t , Huaei "ec+nolo*ies Co.( %td. 2010. All ri*+ts resered.

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.

"rade/ars and Per/issions

 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.

#otice

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. nless otherwise specified in the contract, all statements, information, and recommendations in this

document are provided !A" #"! without warranties, guarantees or representations of any kind, either e$pressed or 

implied.

The information in this document is sub%ect to change without notice. &very 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, e$press or implied.

Huawei Technologies Co., Ltd.

 Address' Huawei #ndustrial (ase

(antian, Longgang

"hen)hen *++-

/eople0s 1epublic of China

2eb site' http'33www.huawei.com

&mail' support4huawei.com

Issue 01 (2015-03-31) Huawei Proprietary and Confidential

  Copyright © Huawei e!hnologies Co"#

$td

3

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 3/19

Issue 01 (2015-03-31) Huawei Proprietary and Confidential

  Copyright © Huawei e!hnologies Co"#

$td

5

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 4/19

%oot Cause &nalysis for 'PI de!rease Contents

About This Document

TroubleTicketNumber

Prepared by houdong 0015*22

Approvedby

ApprovalDate

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 5/19

%oot Cause &nalysis for 'PI de!rease Contents

1 Contents

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

1 Basic Information.......................................................................11

! Problem Description...................................................................!1

" Problem Analysis......................................................................."1

# $oot Cause................................................................................#1

% Corrective Action.......................................................................%1

5"1 +or,around""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""5-1

5"2 olution"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""5-1

& Preventive Action.......................................................................&1

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 6/19

%oot Cause &nalysis for 'PI de!rease . %oot Cause

1 Basic Information

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

 Example:

Product Name 'ersion

/C*00

Issue 01 (2015-03-312010-0-02) Huawei Proprietary and Confidential

  Copyright © Huawei e!hnologies Co"#

$td

1

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 7/19

! Problem Description

he downlin, uality of one site was de!reased after e!ute and rolla!, the re-far4ing s!ript

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 8/19

"

Problem Analysis

$1 did the re-far4ing s!ript on 2300 P4#13 th &pr" and rolla!, on 100 &4#1. th &pr" and the downlin, uality

was de!reased sin!e then"

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 9/19

".1 (peration analyse

Co4pare the !onfig file efore and after the operation# no related para4eter was !hanged

&nd !he!, the operation log#

6!ute

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 10/19

%olla!, 

&nd set the /& to C6$$27/&2&7 afterwise"

".! Alarm analyse

Che!, the alar4# no related alar4 on these !ells"

"." Performance analyse&nd !o4pare the !o8erage le8el and uality efore and after the operation# the downlin, uality was de!reased"

/efore#on 13th &pr"

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 11/19

&fter#on1.th &pr"

he traffi! of these !ells was in!reased sin!e 100# 1.th &pr"

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 12/19

he totall H% rate didn9t !hange

he &:% traffi! didn9t !hanged 4u!h"

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 13/19

&nd the a!!ess reuest ti4e#there was a pea,# and then re!o8er"ut the uality didn9t re!o8er 

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 14/19

&nd we !he!, the other !ells of the /C

he ;$ uality was also de!reased

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 15/19

&nd if we try to find the top !ell#we !an also find !ells de!rease in the ;$ uality

&nd the traffi! trend was the sa4e

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 16/19

o# we !an see that the /C ;$ uality was de!reased# and the !ells didn9t do the operation was also de!reased"o we !an say the de!rease is not related with the operation"

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 17/19

#$oot Cause

he de!rease is not related with the operation# it a nor4al /C wa8e"

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 18/19

% Corrective Action

.

%.1 )orkaround<

%.! *olution

8/20/2019 Huawei_Root Cause Analysis for DL quality decrease

http://slidepdf.com/reader/full/huaweiroot-cause-analysis-for-dl-quality-decrease 19/19

6