10 OWJ200203 WCDMA Access Problems Analysis ISSUE1.0

8/19/2019 10 OWJ200203 WCDMA Access Problems Analysis ISSUE1.0

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OWJ200203 WCDMA

Access Problems Analysis

ISSUE 1.0



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Access is associae! "i# #e call se$%

s$ccess rae o& #e ne"or'. (#is )PI

can be o%imi*e! by means o& +Call

se$% es, an! #e conse-$en ro$ble

s#ooing base! on access &ail$re

analysis.




U%on com%leion o& #is co$rse/ yo$

"ill be able o

e &amiliar "i# #e access

%roce!$re in UM(S

Do analysis on access %roblems

in!e%en!enly



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Chapter 1 Analysis Flow of Access Failure


Chapter 2 The Adjust Methods for Access FailureChapter 2 The Adjust Methods for Access Failure

Chapter 3 Typical access failure casesChapter 3 Typical access failure cases



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Section 1 The definitions about Access FailureSection 1 The definitions about Access Failure

Section 2 The drive test data analysis flowSection 2 The drive test data analysis flow

Section 3 The call statistic data analysis flowSection 3 The call statistic data analysis flow




(#e !e&iniions o& access &ail$re

I "ill be consi!ere! as access &ail$re i& any &ollo"ing con!iions

sais&ie! a&er +55C connecion re-$es, iniiale! by UE

5ecei6e +55C Connecion 5e7ec, message；

UE ransmis or recei6es +55C Connecion 5elease,

message a&er recei6ing +55C Connecion se$%,

UE recei6es any CC8 message in #e call se$% %rocess

(imer e9%ire!/ "#ic# means UE !oes no recei6e +55C

Connecion se$%, in 3 secon!s a&er +55C connecion

re-$es, is ransmie!.

Access failure denitions Access failure denitions


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5an!om access %roce!$re &ail$re： UE !oes no ransmi

,55C Connecion 5e-$es, message

+55C Connecion Se$%, message is no recei6e! by UE

UE !oes no recei6e ,55C connecion se$%, message a&er+55C connecion re-$es, message is ransmie!.

+55C Connecion Se$% Com%lee, message is no ransmie!

by UE

UE recei6es +55C Connecion 5e7ec, message

UE !oes no recei6e meas$remen conrol message a&er

ransmiing +55C Connecion Se$% Com%lee, message

UE !oes no ransmi +CM ser6ice re-$es, message a&er

meas$remen conrol message is recei6e!.



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UE recei6es +Ser6ice 5e-$es 5e7ec, message

UE !oes no recei6e ,Call Procee!ing, message a&er

ransmiing +CM ser6ice re-$es, message

UE !oes no recei6e +5 Se$%, message a&er recei6ing +Call

%rocee!ing, message

UE !oes no ransmi +5 se$% com%lee, message a&er

recei6ing +5 se$%, message

UE !oes no recei6e +Aler or Connec, a&er ransmiing +5se$% , message

UE !oes no ransmi +Connec Ac'no"le!ge, message a&er

recei6ing +Aler or connec, message




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Chapter 1 Analysis Flow of Access FailureChapter 1 Analysis Flow of Access Failure







(#e !ri6e es !aa analysis &lo"

Sub-ows about DT data analysisSub-ows about DT data analysis

Data analysis flow

Paging %roblems analysis &lo"

55C connecion re-$es %roblems analysis &lo"





N

Y

Recei

ved

paging

N

Y

Y

N

N

RRC

connection

setup

failure?

Call Fail?

Paging

problems

RRC setup problems

Analysis drive test data

Calling

failure?

N

Y

Data analysis owData analysis ow




N

N

N

Y

Y

Y

N

Is ciphering

or

authenticatio

n failure?

RAB setup

failure?

ue to

handover

Ciphering or

authentication

problems

RAB or RBsetup problems

Refer to call drop

due to handover

Abnormal problems

Data analysis owData analysis ow(#e !ri6e es !aa analysis &lo"






Daa analysis &lo"

a!in! proble"s analysis flow

55C connecion re-$es %roblems analysis &lo"





Paging %roblems

A&er &inis#ing 5A assignmen an! CC se$%/ UE recei6e!

+Disconnec, message &rom C= insea! o& Alering message

(#e ca$ses o& %aging %roblem #a6e &ollo"ing y%es

5=C !oes no ransmi %aging message

(oo lo"er %o"er allocae! &or P5AC8 or PIC8

Cell reselecion %roblems

ec.

Paging problems analysis owPaging problems analysis ow






Y

N

N

N

Y

Paging problem

RNC

transmit

page?

Po!er

too lo! ?

Cell

reselection

problem ?

Y

Y

N

"#uipment abnormal

problem

Ad$ust po!er

according to

coverage

%ptimi&e cell reselect parameters

Abnormal

problem

'"

receive

page





5=C !oes no ransmi %aging message

5=C #as recei6e! #e %aging message b$ !oes no ransmi %aging

message #ro$g# U$ iner&ace. (#e reasons co$l! be

>Ca%aciy o& %aging c#annel is no eno$g#

> Abnormal %roblem co$l! #a%%en in e-$i%men.

Po"er allocaion &or P5AC8 or PIC8 are oo lo"

UE !oes no recei6e %aging message i& 5=C #as ransmie!.

> (#e iner&erence is oo #ig# com%arai6ely/ "#ic# res$l in #e %oor

recei6ing signal -$aliy o& P5AC8 or PIC8 i& Ec?Io o& PCPIC8. In

#is case/ #ig#er %o"er can be allocae! o #ese "o c#annels

> I co$l! also be #e ba! co6erage i& Ec?Io o& PCPIC8 is oo %oor




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Cell reselecion

UE can no reselec o beer cell in ime

(#e cell reselecion &rom 3@ o 2@ can also be #e reason

by #e reselecion be"een "o ACs.




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Daa analysis &lo"

Paging %roblems analysis &lo"

##C connection re$uest proble"s analysis flow



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55C connecion se$% %rocess incl$!es &ollo"ing se%s

UE ransmis +55C Connecion Se$% 5e-$es, by 5AC8

5=C ransmis +55C Connecion Se$%, by BAC8

UE ransmis , 55C Connecion Se$% CMP, by DC8

(#e reasons &or 55C se$% &ail$re co$l! be

U%lin' 5AC8 %roblem

Po"er allocaion &or Do"nlin' BAC8

Cell reselecion %arameers

o" iniial %o"er o& !o"nlin' DPC8 U%lin' %o"er conrol

Congesion %roblem

E-$i%men abnormal %roblem

RRC connection problems analysis owRRC connection problems analysis ow






RRC setup problem

oes '" transmit

RRC connection

re#uest?

oes RNC

receive RRC

connection

re#uest?

oes RNC

transmit RRC

connection

setup?

'" abnormal

problem

ad$ust PRAC( po!er

%ther problem

N

Y

N

Y

N

Y





oes '" transmit

RRC connection

setup complete


oes '"

receive RRC

connection

setup

oes RNC receiveRRC connection

setup complete

Ad$ust FAC( po!er

Ad$ust do!nlin) initial

transmit po!er parameter

Ad$ust uplin) PCC( openloop po!er control parameter

oes cell

reselection

happen?

%ptimi&e cell

reselection parameters

Y

N

N

Y

Y

N

Y

N

Y

Y





(#e %ossible reasons &or 55C connecion esablis#men &ail$re 5AC8

> Us$ally/ i co$l! be #e %roblem on 5AC8 i& #e 5=C !oes no

recei6e 55C Connecion 5e-$es message. Mean"#ile/ #e Ec?Io

o& CPIC8 is normal

(#e cell reselecion %arameers

> (#e im%ro%er %arameers seing co$l! res$l in #a UE can no

say in #e bes cell o iniiae #e access %roce!$re

o"er %o"er allocaion &or iniial ransmission %o"er o& !o"nlin' DPC8

> (#e ins$&&icien %o"er o& DPC8 can ca$se #e o$ o&

sync#roni*aion.

U%lin' iniial ransmission %o"er

> (#e iniial ransmission %o"er o& P5AC8

> (#e iniial ransmission %o"er o& $%lin' DPC8





RRC connectionRRC connection

1% CCCH & ##C Connection #e$uest

'% Downl in( Synchronisation

)* +ode ,Serving RNS

Servin!#+C

DC- . F

Allocate #+T/Select 01 and 02para"eters

##C##C

+,A+,A

3% #adio 0in( Setup #esponse

+,A+,A

2% #adio 0in( Setup #e$uest

##C ##C % CCCH & ##C Connection Set up

Start #description

Start Tdescription

% A0CA /ub Data Transport ,earer Setup

##C##C 4% DCCH & ##C Connection Setup Co"plete

5% )plin( Synchronisation

+,A+,A 6% #adio 0in( #estore /ndication

DC- . F

DC- . F

DC- . F











(#e call saisic !aa analysis &lo"

C#ec' +5A se$% s$ccess rae, an! +55C se$% s$ccess rae, in

ra&&ic saisics !aa

@e &amiliar "i# #e ne"or' o%eraing si$aion/ an! #en %osiion #e

s%eci&ic area &or #e %roblems

(#e 55C?5A se$% s$ccess rae are calc$lae! by #e &ollo"ing

&orm$las

*+,,×=

ervices four QoS sts in all RRC reques Number of

ervices four QoS sup in all RRCs set Number ofccRate RRCSetupSu

*+,,×=

ervices four QoS sts in all RAB reques Number of

ervices four QoS sup in all RABs set Number ofccRate RABSetupSu

*+,,××= ccRate RABSetupSuccRate RRCSetupSuuccRateCallSetupS





Analysis access

in!e9 abo$ cell

C#ec'

sysem alarmSol6e %roblem o&

e-$i%men abnormal

,55C se$%

s$ccess rae, is

oo lo"

Sol6e %roblem o&

55C se$% &ail$re

Y

Y

N

Analysis access in!ices in

5=C call saisic !aa

N

Call Statistic Data Analysis Flow cart Call Statistic Data Analysis Flow cart





5A se$%

s$ccess rae,

is oo lo"

5 se$%

s$ccess rae,

is oo lo"

%aging

s$ccess rae,is oo lo"

Sol6e %roblem o&

5A se$% &ail$re

Sol6e %roblem o&

5 se$% &ail$re

Sol6e %roblem o&

%aging &ail$re

over

Y

Y

Y

N

N

N

Y

Call Statistic Data Analysis Fl ow cart Call Statistic Data Analysis Flow cart










Pro7ec %arameers

Pro7ec %arameers main incl$!e anenna ban!"i!#/

anenna il angle/ anenna gain/ anenna !irecion/ ec.

In general/ %ro7ec %arameers can be a!7$se! only in %oor

co6erage con!iion.

(#e in&l$ence on #e original co6erage -$aliy #as o be

consi!ere! "#en a!7$sing #e %ro7ec %arameers.





Section 1 project para"etersSection 1 project para"eters

Section 2 cell para"etersSection 2 cell para"eters




Cell %arameers

(ransmission %o"er o& BAC8/ PC8 an! PIC8

In #e e!ge o& cell/ UE can no recei6e #e signaling or

ser6ice correcly i& #e ransmission %o"er is oo lo". $ on

#e conrary/ #ig#er ransmission %o"er can increase #e

iner&erence/ "#ic# can res$l in #e !ecline o& a!7acen cells

ca%aciy (ransmission %o"er o& AIC8

In #e e!ge o& cell/ UE can no recei6e #e AI i& #e %o"er is

oo lo"

P5AC8

(#e ma9im$m imes o& reransmission &or %reamble

(#e %o"er ram%ing se%

(#e %o"er o&&se be"een %reamble an! message

Pysical cannels parametersPysical cannels parameters




Cell %arameers

#ys

(#is %arameer is $se o a6oi! PI=@PA=@ cell reselecion

in #e cell e!ge. Ping%ong cell reselecion "ill ca$se

signaling loa! increase an! "ase %o"er o& UE beca$se o&

&re-$en cell reselecion/ A $%!ae or U5A $%!ae. (#e %arameer 6al$e is relae! o local slo"ing &a!e

c#aracerisics.

(reselecions

(#e !$raion ime #a arge cell signal -$aliy is beer #an

c$rren cam% cell is longer #an (reselecions. (#e cell "ill

be selece! o #e cam%ing cell.

(#e %arameer is $se o a6oi! %ing%ong cell reselecion

Cell reselection parametersCell reselection parameters




Cell %arameers

Sinrasearc#

Sinrasearc# is #e #res#ol! &or inra&re-$ency cells

meas$remen. W#en #e Ec?Io o& c$rren cell is less #an

rel9min2Sinrasearc#/ #e meas$remen "ill be iniiae!.

I "ill in&l$ence on #e ra%i!iy o& cell reselecion/ an! #en

#e access s$ccess rae.

(#is 6al$e co$l! be se as grea as %ossible i& #e UE

baery is no a %roblem

Cell reselection parametersCell reselection parameters










(y%ical Access Bail$re Cases

Ina%%ro%riae Seing &or #e %o"er o& PC8 an! PIC8

UE canF recei6e %aging message correcly "#en PIC8 an! PC8

%o"er are oo lo". (#e %o"er co$l! be increase! "i# #e %oor

ne"or' co6erage

(#e %aging message is being ransmie! "#ile UE is !oing A $%!ae

I mainly #a%%ens #e %roce!$re o& inersysem cell reselecion.

UE lea6es #e ne"or' "i#o$ !eac# %roce!$re

C= !oes no recei6e #e A $%!ae &rom UE %erio!ically

UE is o$ o& ser6ice area &or a long ime

Ina%%ro%riae o%eraion/ s$c# as $n%l$g baery o& UE !irecly/ or

SIM car! !irecly

Paging problemsPaging problems





UE ransmie! 55CConnecion5e-$es message "ice in !i&&eren cells

An! #e iner6al be"een #em is 1.2s

Cell reselection problemCell reselection problem





5easons

UE !i! no iniiae #e reselecion in ime

Sol$ion me#o!s

(#e (selecions co$l! be minimi*e!/ b$ #e !e&a$l 6al$e isalrea!y #e minim$m.

Minimi*e #e #ys2 6al$e/ b$ #e reselecion is sill no in

ime. On #e conrary/ #e %ing%ong cell reselecion

#a%%ene!

Do no mo!i&y #ys2/ b$ increase #e Sinrasearc# 6al$e.

Since #e meas$remen is iniiae! earlier/ #e reselecion

can #a%%e! earlier oo.

Cell reselection problemCell reselection problem





(#e calling s$ccess rae an! calle! s$ccess rae are greaer #an <:G &rom )PI/

b$ 55C esablis#men s$ccess rae is abo$ <G &rom ra&&ic saisic

A&er analysis/ #e 55C Connecion 5e-$es reransmission is #e res$l o&

&ollo"ing reasons

(#e area "i# goo! !o"nlin' co6erage5=C can no recei6e #e 55C Connecion 5e-$es

message &rom UE in $%lin'

(#e area "i# %oor !o"nlin' co6erageUE can no recei6e 55C Connecion Se$% &rom 5=C

in !o"nlin'

A&er UE ransmis 55C Connecion 5e-$es

message/ #e cell -$aliy !ecrease! s#ar%ly/ an! UE

#as o !o cell reselecion imme!iaely

A&er cell reselecion/ UE reransmis #e 55C

Connecion 5e-$es in ne" cell

O#er reasons

Cell %#one abnormal

UE !ose no ransmi 55C Connecion 5e-$es a&er

recei6ing %aging

RRC connection problemsRRC connection problems




RRC connection problemsRRC connection problems


Sol$ion me#o!s

A!7$s #e ma9im$m %reamble reransmission imes &rom ; o 20

Increase #e ransmission %o"er o& P5AC8 an! BAC8

E9%erimenal concl$sion (#e error o& iniial %reamble ransmission %o"er/ "#ic# is calc$lae! by #e

o%en loo% %o"er conrol/ co$l! be ?<!/ or e6en ?12!

(#e %reamble %o"er climbing se% is 2!/ an! #e error co$l! be ?1.!

I& #e o$si!e iner&erence is #ig#er 10!/ eno$g# margin s#o$l! be gi6en

&or #e %reamble ransmission %o"er Increase #e BAC8 %o"er &rom #e !e&a$l 6al$e 1! o 1!

Increase #e access s$ccess rae in #e con!iion #a Ec?Io is 1!





RA! or R! establisment problemsRA! or R! establisment problems

Esablis#men re-$es is re&$se!

(#e regiser in&ormaion in 85 is no i!enical "i# #e ser6ice

re-$es

(#e re-$es is beyon! #e abiliy o& UE

I& #e ser6ice re-$es is beyon! #e abiliy o& UE/ S@S= "ill

renegoiae oS o iniiae a ne" 5A assignmen again ill #e

abiliy o& UE can sais&y #e oS. Us$ally/ #e ma9im$m !aa rae is

same as #e ma9im$m abiliy o& UE

I& #e ma9im$m abiliy o& UE sill can no s$%%or #e oS/ #e 5A

esablis#men is &aile!.





8an!o6er can also #a%%en

in #e %rocess &rom 55C

Connecion com%lee o

5A assignmen com%lee

or 5 esablis#men

com%lee

(#e &ollo"ing &ig$re is #e

5=C signaling race &orsingle UE

"ando#er problems"ando#er problems





Cell signaling sreng# recor!

Brom #e recor!/ #e sreng# o& cell 121 !ecrease! s#ar%ly.

Mean"#ile/ 5=C ransmie! Aci6eSe U%!ae. $ UE can no recei6e

i

(o sol6e #is %roblem/ #e #an!o6er %arameers s#o$l! be a!7$se! o

ma'e i #a%%en earlier

"ando#er problems"ando#er problems



""".#$a"ei.com

(#an' Ho$

10 OWJ200203 WCDMA Access Problems Analysis ISSUE1.0

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