Paging Success Rate Degradation Report Version 4

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Paging Success Rate Degradation Report

Content

1 MSC-CS Paging Policy And KPI Statistics

2 Paging Capacity of RNC Iu And UU Interface

3 Top Worst LAC DT Analysis

4 Conclusion And Suggestion

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Text (1-5 Level)Type ArialSize 28~12ptColor Black

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MSC-CS Paging Policy

Page Message Resend Times

Page With TMSI(first time)

first time page timer

Page With IMSI(second

time)second time page timer

Final Page Scope

Period update timer

1 yes 6000ms yes 6000ms LAC 186minutes

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Paging flow chart

Paging Type 1

Paging Type 2

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2014-7-21 1300 2014-7-23 400 2014-7-24 19002014-7-26 1000 2014-7-28 100 2014-7-29 1600 2014-7-31 700 2014-8-1 2200 2014-8-3 130080

82

84

86

88

90

92

94

96

3MSSNMA2Z paging success

change last page scope from one LAC to all LAC

change last page scope from all LAC to one LAC

Second page scope change from one LAC to all LAC at 1800 31th JulyRemark decrease cause of RNC NMA5Z upgrade activity

KPI after change second page scope(hourly)

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Remark Mark red mean page success during second page scope ALL LAC Mark blue mean page success average on July KPI improve about 02 on daytime

KPI after change second page scope(hourly-average)

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CN paging times and VLR Subscribers (3MSSNMA2Z-monthly)

Feb14 Mar14 Apr14 May14 Jun14 Jul140

100000

200000

300000

400000

500000

600000

Number of Subscribers in VLR

Feb14 Mar14 Apr14 May14 Jun14 Jul140

20000000400000006000000080000000

100000000120000000140000000160000000180000000200000000

Times of paging attempted(CN)

Note the users and paging number increase a lot from Feb to July

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Paging Times via Iu-CS

DateTotal Times of paging Iu-CS(CN send to RNC)

Total Times of paging Iu-CS(RNC receive from CN)

Total Times of Paging Response(CN receive from RNC)

Total Times of Paging Response(RNC send to CN)

2014-7-28 1135713 1135917 943786

2014-7-29 1129946 1130171 929778

2014-7-30 1153576 1153836 940588

2014-7-31 1282080 1474395 1026692

2014-8-1 1295505 1584467 1067091

2014-8-2 1186677 1186834 951881

2014-8-3 1145547 1145671 927827

Content

1 MSC Paging Policy And KPI Statistics

2 Paging Capacity of RNC Iu And UU Interface

3 Top Worst LAC DT Analysis

4 Conclusion And Suggestion

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Paging Capacity of RNC Iu Interface bullEvery CMP module can deal with 840000 Paging messages per hour from CNbullThere are 4 CMP modules configured for CS PagingbullThe total Paging capacity an hour is 8400004=3360000 paging messagesbullThe number of CMP modules which handles Paging messages can be configured by

parameter URncFunction gRESPARA42 USERLABE

Lth MEID OFFICEID ASSOCIATIONSEQ MODULE

User labelManaged Element Object ID

Adjacent Office ID Association ID

CMP Module

No

string long[14095]

long[12048] long[13000] long

[363]

It contains no more than 80 characters

　Quote the Adjacent Office ID of Adjacent Office(CN) sheet

2G120483G13000AG13000The recommended value for UMTS is 1 to 1000

2G3633G331AG331

R Primary Key

Primary Key Primary Key R-W-I

3MSSNMA2Z 437 1 2001 33MSSNMA2Z 437 1 2002 43MSSNMA2Z 437 1 2003 53MSSNMA2Z 437 1 2004 6

bullIf one hour statistics of the counter C310680207 (Total Number of Paging message received from CN) is less than the total capacity it means that the capacity is not limited

parameter Parameter Description

URncFunction gRESPARA42

This parameter indicates that how many CMP modules can handle PAGING message for IUIURValue 0 or 1 indicate the Paging message is handled by the CMP with transport link which receive the paging

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Paging Capacity of UU Interface

Related PCCH parameters are defined in Criterion 34108 Two modes

240bit10ms and 80bit10ms are transmitted in PCCH We usually use the mode

240bit10ms According to the definition in the protocol the length of IMSI-GSM-MAP

is 60bitswith further consideration of selection bits and paging reason bits one

PCCH frame can carry 3 IMSI The length of TMSI-GSM-MAP or PTMSI-GSM-MAP

is 32bits therefore one 10ms PCCH frame comprises at most 5 TMSI paging or

PTMSI paging

Paging channel of each cell includes one of the following combinations

3 IMSI paging

1048727 5 TMSI paging

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Assume GOS is 2 there are total 15IMSI+85TMSIPTMSI in this network

So the CE number is 5085+3015=47 After checking the Erl-B table as below

the hourly paging number should be 111003600=396000

Erl-B table

NoCE GOS=1 GOS=2 GOS=5

0 0 0 0

1 00101 00204 005264

2 0153 0223 03814

3 0455 0602 08994

4 0869 109 1525

5 136 166 2219

6 191 228 2961

Paging Capacity of UU Interface

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Paging Capacity of UU Interface

Note There are 3 LAC in RNC 437the hourly paging maximum number from CN is about 350000 for LAC 1345 According to the PCCH capacity There should be no pcch capacity problem

2014-07-28 000000 2014-07-28 180000 2014-07-29 120000 2014-07-30 060000 2014-07-31 000000 2014-07-31 180000 2014-08-01 1200000

50000

100000

150000

200000

250000

300000

350000

400000

Number of CN Originated Paging Type 1 Request in Cell(Times)

1345 2345 3345

Content

1 MSC Paging Policy And KPI Statistics

2 Paging Capacity of RNC Iu And UU Interface

3 Top Worst LAC DT Analysis

4 Conclusion And Suggestion

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RNC437 have 3 LACLAC1345 mainly in Urban areaLAC2345 and LAC3345 mainly in suburb and country area

Coverage analysis

1345

3345

2345

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Coverage distribution

LAC1345 mainly in Urban areaLAC2345 and LAC3345 mainly in suburb and country area LAC 1345 coverage is better than other 2 LAC

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Event site test analysis

BHUDM

BHUDM

This 2 sites have low paging success rate and at the boundaries we choose this 2 sites for coverage test test by short call

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Event site test analysis

TxPower

RSCPRSCP

TxPower

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Event site test analysis

Event1 block callThis event UL already sent RR paging response message donrsquot have paging problem the reason of block call is weak coverage

Content

1 MSC Paging Policy And KPI Statistics

2 Paging Capacity of RNC Iu And UU Interface

3 Top Worst LAC DT Analysis

4 Conclusion And Suggestion

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Paging Success Rate Conclusion And Suggestion

ConclusionPaging success rate degradation is not related with paging capacity of Iu and UU interfacePaging success rate degradation mainly come from poor coverageSuggestion Suggest to adjust minimum Required Received Level in the Cell(Qrxlevmin)(dBm) from -111 to -105 and minimum Required Quality Level in the Cell(Qqualmin)(dB) from -18 to -15 of LAC 2345 cellSuggest to increase PICH Power(dB) from -7 to -5 of LAC 2345 cell also change DCH Downlink AC Threshold() from 85-gt95 Suggest to adjust detected Preamble Threshold(dB) from -21 to -24 for LAC 3345 cellSuggest to adjust PRACH Initiation Tx Power Constant Value(dB) from -21 to -18 for LAC 3345 cellSuggest to change period LAU timer from 3 to 1 hour in CN and RNC

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Thanks