SR5251060 Root Cause Analysis for RRC Setup Success Rate Degradation

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SR5251060 Root Cause Analysis for

RRC Setup Success RatedegradationIssue 011

Date 2010-07-0219

!A"#I $#C %&'&(I#S C&)* '$D)

Issue 01 (2015-10-19) Huawei Proprietary and Confidential Copyright © Huawei e!hnologies Co"#

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Copyrig+t , ua ei $ec+nologies Co)* 'td) 2010) All rig+ts reser.ed)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.

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All or part of the products, services and features described in this document may not be within the purchase scope or theusage scope. nless otherwise specified in the contract, all statements, information, and recommendations in thisdocument are provided !A" #"! without warranties, guarantees or representations of any kind, either e$pressed or implied.The information in this document is sub%ect to change without notice. &very effort has been made in the preparation of thisdocument to ensure accuracy of the contents, but all statements, information, and recommendations in this document donot constitute the warranty of any kind, e$press or implied.

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Address' Huawei #ndustrial (ase

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&'52510 0 'oot Cause nalysis for ''C &etup&u!!ess 'ate degradation Contents

About This Document

Trouble Ticket InformationTroubleTicketNumber

52510 0

Prepared by Huanghui 0020 *95

Approvedby

ApprovalDate

2015-10-19

Revision HistoryIssue Date Author Change Description

01 2015-10-19 Huanghui0020 *95

+irst ,ersion


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&'52510 0 'oot Cause nalysis for ''C &etup&u!!ess 'ate degradation Contents

Contents

About This Document!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!iii "asic Information!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #

$ Problem Description!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! $#

% Problem Analysis!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!%#%"1 he egradation of ''C &etup &' is .ainly !aused /y $"''C"&etup+ail" o'eply"""""""""""""""""""""""""""""""""""%-1

%"2 P 3 Cause the ''C &etup &u!!ess 'ate degradation in the &ite $ 34 o/son ille46&7 014&6&""""%-2

%"2"1 nalysis at 201581081 05:00""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

%"2"2 nalysis at 201581081 0 :00"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

%"% P 3 Cause the ''C &etup &u!!ess 'ate degradation in the &ite $ 34 upen4'd46&7 014&6&""""""%-5%"%"1 nalysis at 201581081% 01:00""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

%"%"2 nalysis at 201581081% 02:00""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

& Root Cause!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

' Corrective Action!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'#5"1 ;or


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&'52510 0 'oot Cause nalysis for ''C &etup&u!!ess 'ate degradation Pre enti e !tion

$ "asic Information Product Name )ersion

= &%900 ,100'009C00&PC2%0


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http://10.202.163.132:8081/secure/IssueNavigator.jspa?reset=true&mode=hide&sorter/order=ASC&sorter/field=priority&pid=10301&customfield_10162=12365http://10.202.163.132:8081/secure/IssueNavigator.jspa?reset=true&mode=hide&sorter/order=ASC&sorter/field=priority&pid=10301&customfield_10162=12365


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% Problem DescriptionCusto.er !o.plained that two e ode=s> ''C &etup &u!!ess 'ate degraded# as shown in +ig 2-1 and +ig 2-2"Huawei need to e?plain the degradation"

+igure 2-1 ''C &etup &' of $ 34 o/son ille46&7 014&6&

+igure 2-2 ''C &etup &' of $ 34 upen4'd46&7 014&6&


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& Problem Analysis4.1 The Degradation of RRC *etup *R is mainlycaused by +!RRC!*etup,ail!NoReply!

+ro. !ounters# ''C &etup +ail is .ainly !aused /y $"''C"&etup+ail" o'eply# as shown +ig %-1 and +ig %-2"

+igure %-1 ''C &etup +ail detail reason of $ 34 o/son ille46&7 014&6&

+igure %-2 ''C &etup +ail detail reason of $ 34 upen4'd46&7 014&6&

$"''C"&etup+ail" o'eply 7easure.ent Points as /elow:


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4.2 T-P ./ Cause the RRC *etup *uccess Ratedegradation in the *ite+T/0Dobsonville01*2T3 0*1*

nalysis .ain /oard log at 05:00 and 0 :00 2015-10-1 for e?a.ple# $"''C"&etup+ail" o'eply o!!ured 12 and1@9 on !ell%"


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+igure %-% $"''C"&etup+ail" o'eply of site $ 34 o/son ille46&7 014&6&

&!$! Analysis at $3 '4 34 & 3'533Che!< CH' log of this ti.e slot# also 12 re!ords# and e?!ept first re!ord# others ha e regularity# that is e ery 5ti.es is a !y!le# ea!h .essage inter al 11A12s"


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+igure %- CH' log of site $ 34 o/son ille46&7 014&6&

&!$!$ Analysis at $3 '4 34 & 3(533Che!< CH' log of this ti.e slot# also 1@9 re!ords# and e?!ept 3 not sent 1 ti.e # others ha e regularity# that is

e ery 5 ti.es is a !y!le# ea!h .essage inter al 11A12s"


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+igure %-5 CH' log of site $ 34 o/son ille46&7 014&6&

4.3 T-P ./ Cause the RRC *etup *uccess Ratedegradation in the *ite+T/0Nupen0Rd01*2T3 0*1*

nalysis .ain /oard log at 01:00 and 02:00 2015-10-1% for e?a.ple# $"''C"&etup+ail" o'eply o!!ured 20 and21 ti.es on site"


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+igure %- $"''C"&etup+ail" o'eply of site $ 34 upen4'd46&7 014&6&

&!%! Analysis at $3 '4 34 % 3 533Che!< CH' log of this ti.e slot# also 20 re!ords# all re!ords ha e regularity# that is e ery 5 ti.es is a !y!le# ea!h.essage inter al around 22s"

+igure %-* CH' log of site $ 34 upen4'd46&7 014&6&


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&!%!$ Analysis at $3 '4 34 % 3$533Che!< CH' log of this ti.e slot# also 21 re!ords# all re!ords ha e regularity# that is e ery 5 ti.es is a !y!le# ea!h.essage inter al around 22s"

+igure %-@ CH' log of site $ 34 upen4'd46&7 014&6&


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' Root Cause''C &etup +ail !ause /y 3 o 'eply# whi!h !ause /y P users in li e networ


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( Corrective Action "16orkaround

6.2 *olution "


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7 Preventive Action

SR5251060 Root Cause Analysis for RRC Setup Success Rate Degradation

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