analysis report on low paging success rate due to cn configuration [1]

8/15/2019 Analysis Report on Low Paging Success Rate Due to CN Configuration [1]

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Analysis Report on Low Paging Success Rate due to CNconfiguration

Internal Use only

Analysis Report on

Low Paging Success Rate due to CN

configuration

Drafted by: Nicole Ch’ng Joe

Huan (702394)

Date: 8/7/2011

Reviewed by: Date:

Reviewed by: Date:

Approved by: Date:

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Contents

Analysis Report on((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((1

Low Paging Success Rate due to CN configuration(((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((1

1. Po!le" #esci$tion(((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((()

2. Cause %nal&sis(((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((*

i( Para+eter and figure related to Paging Audit,(((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((*

-( Paging discard due to "ig. SPU flow control,((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((*

-i( LAC /oundary Planning and Configuration Audit,((((((((((((((((((((((((((((((((((((((((((((((((((((((((((

-ii( Paging Losses due to PC" C.annel Congestion at UU interface(((((((((((((((((((((((((((((((((

-iii( Paging Counter and PI Audit((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((10

i3( Inconsistent LAC Setting for certain cells in Core networ4((((((((((((((((((((((((((((((((((((((((((((11

3. 'uggestion an 'u""a&((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((1'



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1. Problem Description

n Count& *$eato H+ custo"e co"$laint on call access ,ailue in goo - conition.

o" CN CH- log checing+ the call is elease ue to this call has !een elease (no"al

call cleaing) !& su!sci!esel, !ecause ' i not eceie the Paging es$onse "essage

,o" u inte,ace.

o" $e,o"ance statistic+ the tens o, Paging 'uccess -ate in CN ae not "atch ith the

-NC. o" CN+ the Paging success ate is aeage 80 hile -NC Paging 'uccess ate is

aeage 50 onl&.

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igue 16 Paging 'uccess -ate in Coe neto

igue 2 6 Paging 'uccess -ate in -NC

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2. Cause Analysis

he anal&sis ste$s hae !een taen ae6

i.Paa"ete an ,igue elate to Paging %uit6

ii.Paging iscas ue to High 'P ,lo contol6

iii.%C :ouna& Planning an Con,iguation %uit6

i;.Paging osses ue to PCH Channel Congestion at inte,ace.

;.Paging Counte an


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igue 46 ;'.-%N%P.Pagingoss s Paging 'uccess -ate

=hen the 'P CP usage eaches cetain theshol+ the ,lo contol algoith" ill stat. t is

the !asic ,eatue in -NC to $otect the haae an sta!ilit& o, s&ste".

he Paging isca ue to ,lo contol ill tigge the "easue"ent on countes

%!.RANAP.CsPaging.&oss' %!.RANAP.PsPaging.&oss.

he ,lo contol theshol that elate to $aging can !e ,in as co""an !elo.

SET FCCPUTHD:BRDCLASS=XPU, SLPAGECTHD=80, SLPAGERTHD=70,

CPAGECTHD=90 , CPAGERTHD=75. he etail o, the $aa"ete can !e o!taine in a!le 1 6

lo Contol theshol $aa"ete that elate to $aging.

:ase on 'P loa checing+ PlaBa


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t&$e 2 "essage "ight !e u ,lo contol+ o high CP usage. , the -NC oes not es$on to

a $aging "essage that is consecutiel& etans"itte+ the -NC counts it onl& once.

a!le 2 6 lo Contol theshol $aa"ete that elate to $aging

Parameter )D Parameter

Name

Paa"ete #esci$tion

'P%A@CH# '' an C'

$age contol

theshol

eaning6 CP usage theshol ,o $aging ,lo contol

oe su$$le"enta& seices ('') an location seice

(C'). =hen the aeage CP usage o, sliing inos

eaches o eDcees the theshol+ '' an C' $aging

,lo contol is tiggee.

-eco""ene ;alue6 80

'P%A@-H# '' an C'

$age estoe

theshol

eaning6 CP usage theshol ,o ecoe& ,o" $aging

,lo contol oe su$$le"enta& seices an location

seice. =hen the aeage CP usage o, sliing inos

is loe than the theshol+ '' an C' $aging ,lo

contol is sto$$e.-eco""ene ;alue6 70

CP%A@CH# Call $age

contol

theshol

eaning6 CP usage theshol ,o call $aging contol.

=hen the aeage CP usage o, sliing inos eaches

o eDcees the theshol+ call $aging ,lo contol is

tiggee.

-eco""ene ;alue6 90

CP%A@-H# Call $age

estoe

theshol

eaning6 CP usage theshol ,o ecoe& ,o" call

$aging contol. =hen the aeage CP usage o, s"ooth

inos is loe than the theshol+ call $aging ,lo

contol is sto$$e.

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-eco""ene ;alue6 7

iii. &AC *oundary Planning and Configuration Audit:

%s neDt ste$+ the %C !ouna& $lanning an con,iguation is taen $lace.

@Dtact the %C in,o"ation ,o" co""an E%## C@'@PF an "ae a su""a& ta!le

as !elo6

&AC RNC

++, ++- rand /otal

9992 414 0 414

9993 353 0 353

9994 33 0 33

999 3 8

9995 5 714 720

9997 25 0 25

9999 0 1 1

Aan

otal

17 1270 284

o" the su""a& ta!le+ it is ,oun out thee ae 9 cells(%C999 an9995 in -NC 994)

that shae %C ith -NC 99. %,te ,uthe anal&sis+ 9 cells alea& eho"e ,o" -NC 994 to-NC 99. hose Cell in,o"ation haen’t !een elete ,o" -NC 994 onl&.

his in o, u$lication Cell in,o"ation in -NC ill not cause an& "aGo $e,o"ance issue

lie lo Paging 'uccess ate. %n&a&+ the u$lication cells # hae !een elete.

he cell ith %C9999 is test!e cell onl&.

hen a the %C the"atic "a$ in "a$ in,o tools. he %C !ouna& $lanning is $lan

a$$eciate hee no islan %C site in -NC.

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iv. Paging &osses due to PC" C#annel Congestion at $$ interface.

igue 6 Cell PCH Channel usage ate an --C.Paging1oss ue to PCH Congestion

u Paging Congestion Cell atio is 0 an PCH !anith usage ate is aoun 0.

i) u Paging Congestion Cell atio6 he PCH Channel is not congeste !ase on the

$e,o"ance statistic checing. he counte that "easue is

;'.--C.Paging1.oss.PCHCong.Cell. n ail&+ ;'.--C.Paging1.oss.PCHCong.Cell is less

than 200 hich conti!ute Paging Congestion atio onl& 0.0030 o !elo.

(easurement point for %!.RRC.Paging1.&oss.PC"Cong.Cell

he "easue"ent is tiggee hen the -NC iscas a $aging "essage ue to PCH

congestion. his counte inicates the nu"!e o, Paging essages #iscae #ue to PCH

Congestion ,o Cell.

ii) PCH !anith usage ate6 *eall PCH sage is uite high hee the eco""ene

theshol is onl& 0.

o esole the PCH !anith usage ate+ %C e$lanning an aing "oe 'CCPCH

channel can !e the solution.

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o this case+ ei,& hethe the nu"!e o, atte"$t ae easona!le ae not ae the neDt ste$s

to ei,& !e,oe an& eD$ansion o e$lan actiit& taen $lace.

v. Paging Counter and 0P) Audit

RNC: )$ Paging !uccess Ratio

?(;'.-%N%P.Paging.'ucc.le@/;'.-%N%P.Paging.%tt.le@)I100

Core Networ: Paging !uccess Rate

? (Nu"!e o, ist Paging -es$onses ,o" u nte,aceNu"!e o, -e$eate Paging

-es$onses ,o" u nte,ace)/Nu"!e o, ist Pagings to u nte,ace)I100



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o this case+ ei,& hethe the nu"!e o, atte"$t ae easona!le ae not ae the neDt ste$s

to ei,& !e,oe an& eD$ansion o e$lan actiit& taen $lace.

%s ste$s to ei,& hethe the nu"!e o, $aging atte"$t ae easona!le o not+ co"$ae the

nu"!e o, $aging atte"$t !eteen -NC an 'C. t is ,oun out that the $aging that eceie

,o" -NC ae 5 ti"es highe than 'C.

%s conseuence+ sus$ect that "is"atching on -NC atte"$t "ight co"ing ,o" ong

counte in -NC o CN.

o ei,& it+ stat u Paging tacing in -NC e! ,o 10 hou ,o" 7$"+ 11 a& until a"+

12 a&. o" the co"$aison esult+ the $aging eceie ,o" coe neto ae "atching ith

the -NC counte s.-%N%P.CsPaging.%tt. hus+ -NC counte "easue"ent ae accuate.



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Internal Use only

in oe to co"$ae the nu"!e o, $aging atte"$t ,o" -NC an Coe neto+

vi. )nconsistent &AC !etting for certain cells in Core networ

o" ,uthe anal&sis on the u $aging tacing+ it is ,oun out that %C isti!ution in

-NC994 ae as ta!le !elo6

%C 270: an 270C ae not the %C in -NC99+ it is !elongs to -NC994. =h& 'C also

sen the -NC99 $aging to -NC 994K

@scalate to CN coe neto enginee to ca& out cell an %C consistenc& chec !eteen

'C an -NC.

t is ,oun out that ong %C in,o"ation hae !een e,ine ,o cetain a"ounts o, cell ue

to so"e cells ae Noe: eho"e ,o" -NC994 to -NC99 !ut the CN con,iguation ae not

u$ate to ne -NC a,te the Noe: eho"e actiit&.

:& eo the u Paging acing+ no "oe $aging "essage eceie !& -NC994 on %C 270:

an 270C. t inicates that Cell an %C con,iguation consistenc& chec an coection ae

one success,ull&.



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%,te coect those inconsistenc& cell in 'C+ the $aging success ate i"$oe ,o" aoun

50 to 70. :ut 70 ,o Paging 'uccess ate still consie unacce$ta!le. =h& the $aging

success ate still loK

t is sus$ect the -%C con,iguation in 'A'N "ight !e inaccuate as ell. @scalate it to P'

coe tea" ,o the Cell # an -%C consistenc& checing.

he esult o, the consistenc& checing sho that the -%C9+ -%C4+ -%C1 an -NC95 ae

unnecessa& an eDta -%C that con,igue to -NC 994.

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P' Coe tea"s elete the inaccuate -%C in 'A'N. he $aging success ate ,uthe

i"$oes ,o" 70 to 90 hich is une acce$ta!le ange no.

. !uggestion and !ummary

n this case+ inaccuate -NC# ,o cetain Cell in 'C an aitional -%C in 'A'N cause

the o Paging 'uccess -ate.

Cooination ith C' coe tea"+ P' coe tea" an HL ae essential to sole the neto

issue e,,icienc&.

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analysis report on low paging success rate due to cn configuration [1]

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