CSSR Analysis

7/17/2019 CSSR Analysis

http://slidepdf.com/reader/full/cssr-analysis-568dddc985d58 1/23

# How is the CSSR formula ?

CSSR_w/o_block = ImmAss SR x SSSSR

ImAss Phase

SSS Proc Phase

TCH AssignmentPhase

ImmAss SR = NSUCCHPNSUCCHPC(SMTCSD)

ATIMASCA

SSS Proc SR =NSUC

NSUCCHPC(SMTCSD)

TCH Ass SR = TASSSUCC(F,H)+

+SUOISHDO(DR)



Proc SR x Ass TCH

C(APSD,CRSD,ECSD,OCSD)-

(APSD,CRSD,ECSD,OCSD)-NSUCCHPC(SMTCSD)

TASSAT (F,H)CHPC(APSD,CRSD,ECSD,OCSD)-

TASSFAIL(NRF,NRH)+SINTHINT(DR)+SUINBHDO(DR)

TASSAT (F,H)



Analysis

# What factor can influence within this phase ? Phase I : ATIMASCA -Loss probabl!" :a# $o S%CCH a&alabl

- H)h (+mber o, re - Lack o, S%CCH re - .&er *le co&era)b# Tra(smsso( probl

- ,lcker !ra(smss - (o! L.S !ra(sms

- +((ecessar" cabl- problems o( C.4

c# H6 problem 7 wro- h)h 0S6R- broke( mo*+le

- +(!)h! co((ec!or - broke( cable/,ee*

- ,abrca!o( ,a+l!" :- cell (&erso( : a(

*# Ra*o I(!er,ace pro- ,re+e(c" (!er,er

- +(bala(ce UL 7 %- +((ecessar" *b s

Phase II : SUIMASCALoss probabl!" :a# Tra(smsso( probl

- see po(! b o( phb# ACH o&erloa*

- see s!a!s!c meas- , !he *,,ere(ces

c# Ra*o I(!er,ace proMS m)h! be *+e !o- see po(! * o( ph

*# H6 problem 7 wro- see po(! c o( ph



Action

SUIMASCA

-' S%CCH a!!emp! mee!() blocke*+es!o+rces

em - Abs (!er,ace -' messa)es loss CH$A01 CH$A23 be!wee( 4TS a(* 4SC(o( obs!acle3 -' wro() !ra(smsso( pla((()

() o( %%5 pa(el A/C.SA mo*+le ) (s!alla!o( o( 4TS -' ba* process()/,al+re1 +(-rece&e*/se(! o, messa)es !owar* 4TS/MS

er 8 h)h loss 4TS ma(boar*1 mo*+le slo!

e((a1 ,ee*er1 backpla(e1 semr)*1 wro() H6 *b crea!o(lem -' messa)es loss be!wee( MS a(* 4TS

e(ce L *+e !o mproper co&era)e o&ershoo! or lack o, co&era)e31 co(!o+r ,ac!or

e!!()

$SUCCHPC

em - Abs (!er,ace -' messa)es loss IMASS1 9STI$3 be!wee( 4TS a(* 4SC se I expla(a!o(

: *,,ere(ce be!wee( TACC4PR. ;3 - $ACSUCPR;3< mea(s !here are ACH o&erloa*lem -' messa)es IMASS1 SA4M1 CMSR93 loss be!wee( MS a(* 4TS 8 (o SA4M se(! !o 4TS b"MS +se* >pha(!om> RACH whe( se(* CH$R9

se I expla(a!o( ) (s!alla!o( o( 4TS -' ba* process()/,al+re1 +(-rece&e*/se(! o, messa)es !owar* 4TS/MS

se I expla(a!o(

a# S%CCH c- a**()- more sel

se! R?L- re*+ce !

b# Ra*o I(!- ,re+e(- hopp()- power c- (o o&er- a(!e((a

c# H6 probl- cha()(- ,x a("

*# Tra(sms- !ra(sm- ,x a(" !

a# Sol&() A- a**() b

b# Ra*o I(!- see po(

c# H6 probl- see po(

*# Tra(sms- see po(



pac!" o&erha(*l() m)h! be *o(e b" :%CCH TS w!h( TR?ec!&e o( ,l!er() MS ,or access() (e!work =' o(l" MS w!h )oo* UL le&el ca( access !he cell a(* )e! RACH90AMI1 RACH4T3he o&er3 co&era)e b" !l!() a*@+s!me(!r,ace +al!" mpro&eme(! :" re!+(eop!ma!o( hop mo*e1 hop ac!&a!o(1 HS$1 mao1 mall ls!s - check ! all3 - ,or *e*ca!e* mo*e(!rol mecha(sm !hreshol*1 s!ep se3 - ,or *e*ca!e* mo*e

co&era)e ,or pre&e(!() (!er,er() w!h o!hers =' *o(e b" co&era)e a*@+s!me(!op!ma!o( a(! !"pe w!h proper beamw*!h1 a(! he)h!1 am+!h1 !l!3m 7 wro() (s!alla!o( ,x() :a(" broke( mo*+le/e+pme(!

ro() (s!alla!o(o( problem o&erha(*l() :so( repla( b" T$P , (o L.S3 b" a(!e((a Bw op!ma!o( he)h!31 !ra(smsso( re-ro+!ea(smsso( cabl()/co((ec!o( problem a(* mo*+le ,al+re

CH o&erloa* b" :lock ACH reser&e* =' se! $4L2ACR1 b+! m+s! co(s*er PCH reser&e* re*+c() mpac! b" (creas() !hs ACH capac!"r,ace +al!" mpro&eme(! :! b o( expla(a!o( abo&em 7 wro() (s!alla!o( ,x() :

! c o( expla(a!o( abo&e

o( problem o&erha(*l() :! * o( expla(a!o( abo&e





# What kind of process (procedures) occurred within this phase ?

# How can the SDCCH connection ecome drop ?

- SSS Procedre P!"se s#"r# $rom C- SDCCH "re "re"d seed '#!& #- M"& SSS rocedre e.e&#s "re rocedres*

- From 4SS po(! o, &ew, oss "&"

A#!e&#c"#o& Process

C!er&% Process



Co&#er S0 Co&#er Descr#o&

N F R L S D C C (

1 , 2

)

1 T344 e5red

3 &soc#ed DM reso&se, m# $r"me es#"0s!ed s#"#e

2 se6e&ce error

7 T8MSRFPCI e5red

9 ds#"&ce m# e5ceeded

: !"&do.er "ccess $"re

; r"do &/ $"re

< remo#e #r"&scoder $"re

&sec$ed (o#!ers)

>!e& BTS !"s se&# ""er 3 "c/&o'ed%em

>!"# m" 0e #!e mos# dro re"so& c"& 0e /&o'& $rom mesreme&# co&#er NRFLSDCC @1- ?

R"do Pro0ems (&#er$e

TRACTRAU mode $TTRAU)

F"re o& HO SDCCH-H>I&s#""#o&)

MS !"s se&# " Um "es#"#eBTS !"s de#ec#ed rre%

T8MSRFPCL s &o# "d

MS-BTS ds#"&ce e5ceEJCDIST



MS R9 mess"%e se&# $rom BSC #o'"rds MSC, "&d s#o "$#er rece# o$ ASS R9*!s !"se*r$ormed dr&% #!s !"se, #!"# "re "#!e&#c"#o&, c!er&%, IMEI c!ec/, TMSI re-"oc"#o&, se# mess"%e, "&d d%# #r"&s"#o&

ss c"& 0e %o# $rom S%CCH *rop co+(!er $RL5S%CC_-D3

IMEI C!ec/ TMSIRe"oc"#o& Procedre

Se# Mess"%e D%#Tr"&s"#o& Procedre



er 3 mess"%e & "c/&o'ed%e mode (#!"# s I ,rame mess"%e ? ASS CM%3 N344+1 #mes #o #!e MS '#!o# rece.&%&# $rom MS (re"so&s ? "& r"do ro0ems m" e5s#) &# T344 #mer e5red, #!e& #!e co&&ec#o&s "re droed*

e&ce, co.er"%e, H>I&s#""#o&)

"re, COBACU $"re, 'ro&% DB se##&% (TTRAU T< , TTRAU T14, TTRAU = TSNC = T!s se##&% s $or e&sr&% #!"# " s%&"&% $"

SDCCH G C"ses ? R"do Pro0ems (&#er$ere&ce, co.er"%e,

r 3 (LAPDm) mess"%e DM (Mode) #o #!e BTS '!e #!e BTS-MS comm&c"#o& s & m#e $r"me s#"0s!ed

"r#es & #!e Um "er 3 (LAPDm) $o' co&#ro $&c#o&s ('ro&% mess"%e se6e&ce) seds &"c/&o'ed%ed mode

s#"0e o& d"#"0"se

ds #!e #!res!od





re (T< "&d T14) s de#ec#ed 0e$ore #r"&scoder $"re (TSNC "&d



# How is this phase ?

# !ASS"A$ causes ?

Co&#er S0 Co&#er $or CHAN TPE

Descr#o&TCHF TCHH

: 11 R"do I&#er$"ce Mess"%e F"re

; 13 R"do I&#er$"ce F"re - re.erso& #o od c!"&&e

< 12 No r"do resorce ".""0e

17 Drec#ed Re#r

14 19 A O#!er C"se T A S S F A I L

( 1 , 2

4 )

- TCH Ass%&me&# P- BSS Co&#er s#"r#- Ac#" TCH Boc/formula

- T!ere s s# oss r- A& TCH Ass%&me

TASSFAIL de #o R"do I&#er$"ce Mess"%e F"re

ASS CM% m- R"do I&#er$- &&ecess"r

Co&#ed "s TCH Ass%&mForm" HCPT - see s!e#



TASSFAIL de #o R"do I&#er$"ce F"re - re.erso& #o od c!"&&e

SA4M mess- R"do I&#er$- &&ecess"r





!"se s#"r# "$#er rece.&% "ss%&me&# re6es# ASS R93 mess"%e o& BSC $rom MSC, "&d s#o "$#er "ss%&me&# come#e ASrom TASSATT "&d e&d 0 TASSSUCC&% &$e&ce #!s !"se, 4UT o& PI Form" HCPT $or CSSR, TCH 0oc/&% s excl+*e* $rom TCH "ss%&me&# $"re, 0# co

o0"0# o& S%CCH %rop w!h T;<< expr" reaso( '#!& #!s !"se = c!ec/ $ "& ra*o problem '!c! c"se oss o$ ASS C&# F"re ' &creme&# TASS5AIL co&#er & BSC

ess"%e s os#, m" 0e c"sed 0 ?"ce ro0em ? I&#er$ere&ce, Co.er"%e, H> F"re >ro&% I&s#""#o& T< se##&%

&# Sccess o& PI CSSRformula



%e s os# '!e s&% FACCH, "ss%&me&# TCH $" "&d back !o S%CCH , m" 0e c"sed 0 ?"ce ro0em ? I&#er$ere&ce, Co.er"%e, H> F"re >ro&% I&s#""#o&

T14 se##&%



H. ACC9SS mess"%e s os# '!e s&% FACCH, "ss%&me&# TCH $" "&d back !o S%CCH o& ol* cell , m" 0e c"sed 0 ?ce ro0em ? I&#er$ere&ce, Co.er"%e, H> F"re >ro&% I&s#""#o&

rec!e* Re!r" HO s er$ormed, TASSFAIL() co&#er ' 0e &creme&#ed



C.M3 mess"%e se&d&%

#ed "s TCH Ass%&me&# Sccess - see o& s!ee#

MD mess"%e







D% &arameter Related

DB P"r"me#er O0ec# Descr#o& K"e Se##&% Tr"de O$$

RJLEKAMI BTS

RACHBT BTS T!res!od $or #!e s%&" e.e o& RACH

NBLACR BTS

T344 BTS

IERCHOSDCC BTS

IRACHOSDCC BTS

EISDCCHHO BTS

TTRAU BTS

TSNC

T14 BSC

M&mm rece.ed e.e "# #!e MSre6red $or "ccess #o #!e &e#'or/

I&cre"se = Ide co.er"%e s!r&/&%, ess "##em# SDCCHDecre"se = Ide co.er"%e e&"r%eme&#, more "##em# SDCCH

I&cre"se = Lo' UL e.e c"& "ccess RACH, more "##em#SDCCH, ess HO $" oss0# de #o FACCH reec#ed*

Decre"se = O& %ood UL e.e c"& "ccess RACH, ess"##em# SDCCH, more HO $" oss0# de #o FACCHreec#ed*

Sec$es #!e &m0er o$ CCCH 0oc/s#o 0e reser.ed & CCCH TS $or ACH GMAINBCCH ro.des CCCH 0oc/s(s!"red 0e#'ee& PCH "&d ACH)

I&cre"se = Add CCCH 0oc/s #o 0e reser.ed $or ACH,decre"se 0oc/es #o 0e reser.ed $or PCH*Decre"se = .c" .ers" $rom s#"#eme&# "0o.e*

LAPDm #mer 344 G de#erm&es #!e'"#&% #me $or " "er 3 $r"me"c/&o'ed%eme&#

S!od 0e "##e&ded #!"# #!s #mer se##&% c"& mc! redce droc" s%&"&% co&ec#o&, 0# c"& "so de.er &o& re"s#cm"%e o$ #!e "c#" r"do &#er$"ce 6"# (ess dro 0# oor6"#)* So &eed roer "ds#me&# "s #r"de o$$

To e&"0e ds"0e &#erce SDCCHHO

Se# Tre = "c#."#e &#erce SDCCH HO, more SDCCH s"%e,more oss0# o& SDCCH $"dro* Se# FALSE = ds"0&%&#erce SDCCH HO, ess SDCCH s"%e, ess oss0# o&SDCCH $"dro

To e&"0e ds"0e &#r"ce SDCCHHO


To e&"0e ds"0e &#erBSC SDCCHHO


Tmer ser.so& s#"r# $rom se&d&%

UL TRAU $r"me "&d s#o '!e& $rs# DLTRAU $r"me rece.ed 0 BTS

Ms# se# #o roer ."e G Ms# $oo' #!e re ? TTRAU T<,

TTRAU T14, TTRAU = TSNC $or e&sr&% s%&"&% $"res de#ec#ed 0e$ore #r"&scoder $"re

BTS GTRAU

Tmer ser.so& s#"r# o$ TRAU $r"me!"&d&%* S#"r# '!e& 2 DL TRAU $r"me!".e&# correc# rece.ed, "&d rese#'!e& correc# $r"me s rece.ed "%"&*

Ms# 0e se# #o roer ."e G Ms# $oo' #!e re ? TSNC =TTRAU G TSNC se##&% & BTS o0ec# ms# 0e s"me '#!TSNC se##&% & TRAU o0ec#

Tme #o re#r& "ss%&me&# come#e(ASS CMP) mess"%e* S#"r# $romse&d&% mess"%e ASS CMD "&d s#o'!e& ASS CMP rece.ed*

Ms# 0e se# #o roer ."e G I& #!e c"se o$ c" se#, #!ese##&% ms# $oo' #!e re ? T14 TTRAU



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CSSR Analysis

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