3G Cluster Packet Service Optimization Report

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3G Cluster Packet Service OptimizationKickof REPORT

DATE: 28-June-2012

Table of Contents

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1 Introduction............................................................................................................................................................................3

2 Tools.......................................................................................................................................................................................3

3 Contact Information...............................................................................................................................................................3

4 Analysis Procedure.................................................................................................................................................................3

4.1 PS CSSR Optimization.......................................................................................................................................................4

4.1.1 Pre Analysis....................................................................................................................................................................4

4.1.2 PS CSSR Optimization...................................................................................................................................................

4.2 PS C!R Optimization......................................................................................................................................................1"

4.2.1 Introduction..................................................................................................................................................................1"

4.2.2 #AC$ Con%estion........................................................................................................................................................1"

4.2.3 #3 Strate%y &odification.............................................................................................................................................2'

4.3 PS T(rou%(put Optimization...........................................................................................................................................21

4.3.1 #undamental C(ec)......................................................................................................................................................21

4.3.2 RT*P Optimization.....................................................................................................................................................21

4.3.3 TCP Accelerator...........................................................................................................................................................32

4.3.4 C+I Ad,ustment -ased on !ynamic -/R Tar%et.....................................................................................................30

4.3. $SPA Adaptie ReTransmission..............................................................................................................................3

Smart P(one Optimization...................................................................................................................................................35

.1 /n(anced #ast !ormancy.................................................................................................................................................35

.2 &ultiRA- Optimization.................................................................................................................................................40

.3 Call Reesta6lis(ment......................................................................................................................................................"

0 Summary and Conclusion....................................................................................................................................................01

Sc(edule...............................................................................................................................................................................00



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1 Introduction

According to Ongoing Service contract or !"#!$ Cluster Packet Service Optimization is one o t%e

de&ned 'ork packages or '%ic% (ua'ei 'ill take t%e responsi)ilities*

PP#! 'as selected or 3G packet service optimization as an e+ample* T%e Anal,sis and

recommendations 'ill )e provided to improve PS CSSR$ C-R and t%roug%put$ etc* .eantime$ some

improvement mig%t )e o)tained on Circuit S'itc%ing -omain as 'ell* As agreed$ t%e )est practices and

e+periences veri&ed in PP#! 'ill )e rollout in entire net'ork ), /odacom*

T%is document is intended to e+plain t%e contracted 3G cluster packet service optimization process$

tools 0 t%e delivera)les attac%ed 'it% t%is service* T%e R1 design related issues and optimizations are

out o t%e scope o t%is activit,*

2 Tools

#2 (ua'ei Con&guration .anagement E+press C.E2 or con&guration data collection 4 5ntegrated on

.!"""

!2 (ua'ei PRS Perormance Reporting S,stem232 Sonar

3 Contact Information

1ollo'ing 'ill )e t%e contact person rom (ua'ei or t%is 'ork package6

7O* 7ame .ail Cell P%one

# Sagar sagar*)a8a89%ua'ei*com :!; ;#o) Sun sunminga 9%ua'ei*com :!; ;?3#@?##3

4 Analysis Procedure

T%is activit, is divided into = categories6

PS Call Setup Success Rate Optimization

PS Call -rop Rate Success Rate Optimization

PS T%roug%put Optimization

Smart P%one Optimization

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1rom t%e grap%s a)ove$ 'e can see t%e main contri)utor to t%e PS RA> ailures are congestions*

On (ua'ei RA7$ t%e congestions are pegged during AdmissionF stage$ admission ailures caused

), Code$ plinkH-o'nlink po'er$ plinkH-o'nlink C%annel Element$ 5u) )and'idt% s%ould )e

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c%ecked*

T%e pie c%art a)ove indicates t%at a)out @lind (andover 5nter 1reJuenc, 7eig%)ors

>lind(o1lagTRE2

7on Coantenna cells canLt )e con&gured 'it% >lind (andover 5nter 1reJuenc, 7eig%)ors

>lind(o1lag1AISE2

T%e Ec7o t%res%old or candidate target -R- cell is #3d> -R-Ec7"T%res%%old2*

M 57TER1REM7CEII

!a"amete" #D -R-Ec7"T%res%%old

!a"amete" $ame -rd EcH7o T%res%old

$E >SC?""

MM% Command ADD $TE'F'E($CE%%

MD $TE'F'E($CE%%

Meann* -R- EcH7o t%res%old or determining '%et%er to perorm t%e )lind %andover* 5t%e measured EcH7o o t%e current cell is greater t%an t%is parameter$ t%is cell

can )e t%e candidate cell or -R-*

#s+e, 7O

Mandato", 7O

Featu"e #D NR1-"!"="""#

Featu"e $ame 5ntra S,stem -irect Retr,

alue T,.e 5nterval T,pe



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/ alue 'an*e !="

Enume"aton

$umbe"t

7ot involved

&nt d>

Actual alue 'an*e !="

Default alue #@

'ecommended

alue

#@

#m.act Cell

!a"amete"

'elatonsh.

7one

Access Read 0 Nrite

e"3ce #nte""u.ted

Afte" Mod4caton

7o

#nte""u.ton co.e 7ot involved

#nte""u.tonDu"aton5Mn)

7ot involved

Cauton 7one

aldaton of

Mod4caton

T%e parameter modi&cation %as no impact on t%e eJuipment*

#m.act on 'ado

$et6o"k

!e"fo"mance

7one

#nt"oduced n

e"son

/ersions earlier t%an >SC?"" /""R"##

Att"bute Radio

S5>## s%ould )e O7

M 57TER1REM7CEII

!a"amete" #D S5>##5nd

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!a"amete" $ame S5>## 5ndicator

$E >SC?""


MD $TE'F'E($CE%%

Meann* 5ndicates '%et%er to send t%e s,stem inormation )lock ## S5>##2 including

neig%)oring cell inormation* T%e value 1AISE indicates t%at t%e neig%)oring

inormation is not included in t%e S5>##* T%e value TRE indicates t%at t%e

neig%)oring inormation is included in t%e S5>##*

#s+e, 7O

Mandato", 7O

Featu"e #D NR1-"#"@"#

NR1-"#"@"!

Featu"e $ame 5ntra R7C Cell pdate

5nter R7C Cell pdate

alue T,.e Enumeration T,pe

/ alue 'an*e 1AISE-o not send2$ TRESend2

Enume"aton

$umbe"t

1AISE"$ TRE#

&nt 7one

Actual alue 'an*e 1AISE$ TRE

Default alue TRE

'ecommended

alue

TRE

#m.act Cell

!a"amete"

'elatonsh.

7one

Access Read 0 Nrite

e"3ce #nte""u.ted

Afte" Mod4caton

7o


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#nte""u.ton

Du"aton5Mn)

7ot involved

Cauton 7one

aldaton of

Mod4caton


#m.act on 'ado

$et6o"k

!e"fo"mance

7one

#nt"oduced n

e"son


Att"bute Radio

T%e Priorit, or Coverage )ased interreJ %andover )et'een Coantenna cells is "F

M 57TER1REM7CEII

!a"amete" #D (OCovPrio

!a"amete" $ame Priorit, o Coverage>ased 5nter1reJuenc, (andover

$E >SC?""


MD $TE'F'E($CE%%

Meann* Priorit, or neig%)oring cell supporting coverage)ased interreJuenc,

%andover* T%e value " indicates t%at t%e coverage)ased interreJuenc,

%andover is not supported* T%e value # indicates t%at t%e cell is assigned 'it%

t%e %ig%est priorit, or t%e %andover* T%e value 3 indicates t%at t%e cell is

assigned 'it% t%e lo'est priorit, or t%e %andover* 5 a %ig%er priorit, is assigned

to a cell$ t%e pro)a)ilit, or selecting t%e cell as t%e measurement o)8ect and t%etarget cell or t%e %andover increases* 1or e+ample$ t%e cell 'it% priorit, # %as

more c%ance to select as t%e measurement o)8ect and t%e target cell or t%e

%andover t%an t%e cell 'it% priorit, !*

#s+e, 7O

Mandato", 7O

Featu"e #D NR1-"!"3"!

Featu"e $ame 5nter 1reJuenc, (ard (andover >ased on Coverage

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/ alue 'an*e "3

Enume"aton

$umbe"t

7ot involved

&nt 7one

Actual alue 'an*e "3

Default alue !

'ecommended

alue

!

#m.act Cell

!a"amete"

'elatonsh.

7one

Access Read 0 Nrite

e"3ce #nte""u.ted

Afte" Mod4caton

7o


#nte""u.ton

Du"aton5Mn)

7ot involved

Cauton 7one

aldaton of

Mod4caton


#m.act on 'ado

$et6o"k!e"fo"mance

7one

#nt"oduced n

e"son


Att"bute Radio

1indings on PP#!6

! cells are not con&gured 'it% >lind (andover 7eig%)ors*

#" neig%)ors S5>## are O11*



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3@ cells6 T%e Priorit, or Coverage )ased interreJ %andover )et'een Coantenna cells is

!F*

=" cells6 T%e Ec7o t%res%old or candidate target -R- cell is #@d>*

>enc%mark6

Slig%t improvement is seen on PS CSSR ater implementation on t%ese cells*

b) &% !o6e" Con*eston .tm7aton

As deault$ uplink po'er admission is )ased on eJuivalent user num)er E726 AIGOR5T(.QSECO7-*

M CEIIAIGOSN5TC(

!a"amete" #D 7>.lCacAlgoSelS'itc%

!a"amete" $ame plink CAC algorit%m s'itc%

$E >SC?""

MM% Command ADD &CE%%A%/#TC9

MD &CE%%A%/#TC9

Meann* T%e algorit%ms 'it% t%e a)ove values represent are as ollo'6 AIGOR5T(.QO116

-isa)le uplink call admission control algorit%m* AIGOR5T(.Q15RST6 T%e load

actor prediction algorit%m 'ill )e used in uplink CAC* AIGOR5T(.QSECO7-6 T%e

eJuivalent user num)er algorit%m 'ill )e used in uplink CAC*

AIGOR5T(.QT(5R-6 T%e loose call admission control algorit%m 'ill )e used in

uplink CAC*

#s+e, 7O

Mandato", ES

Featu"e #D NR1-"!"#"#



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Featu"e $ame Admission Control


/ alue 'an*e AIGOR5T(.QO11$ AIGOR5T(.Q15RST$ AIGOR5T(.QSECO7-$ AIGOR5T(.QT(5R-

Enume"aton

$umbe"t

AIGOR5T(.QO11"$ AIGOR5T(.Q15RST#$ AIGOR5T(.QSECO7-!$

AIGOR5T(.QT(5R-3

&nt 7one

Actual alue 'an*e AIGOR5T(.QO11$ AIGOR5T(.Q15RST$ AIGOR5T(.QSECO7-$ AIGOR5T(.QT(5R-

Default alue 7one

'ecommendedalue

7one

#m.act Cell

!a"amete"

'elatonsh.

7one

Access Read 0 Nrite

e"3ce #nte""u.ted

Afte" Mod4caton

7o


#nte""u.ton

Du"aton5Mn)

7ot involved

Cauton 7one

aldaton of

Mod4caton


#m.act on 'ado

$et6o"k

!e"fo"mance

7one

#nt"oduced n

e"son


Att"bute Radio

E7 Calculations6



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E7 Counter6

Counter /S*RAC*I*EJvser7umF can indicate t%e real E7 or eac% cell*

Norst perorming cells in PP#! 'it% plink Po'er congestion6

Recommendations6

13 pgrade i possi)le

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5ncrease admission t%res%old impact all t,pes o admission control2

-isa)le uplink CAC Call Admission Control2

>enc%mark or disa)ling I po'er CAC on severe congested cells6

plink Po'er Congestions are cleared$ and PS CSSR is around *


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o total allo'ed !"" or PS service in I direction or all cells* Nit% &ne tuning o parameters$ allo'ed

I E7 percentage is set to "$ '%ic% increased t%e total allo'ed num)er rom #3" E7 to #@" E7*

5n case o sudden trac increase$ since algorit%m is still active )ut 'it% an optimized set o

t%res%olds$ in case o %ig% load$ reJuired CAC actions 'ill )e triggered and s,stem sta)ilit, 'ill )e

kept constant*

>elo' are old and ne' values regarding to t%e c%ange* Please note$ t%e t%res%old values or Conv

and nonConv A.R services %ave )een c%anged to satis, t%e

&l$onCt"lThdFo"9o &l$onCt"lThdFo"AM'; &l$onCt"lThdFo"AM' &l$onCt"lThdFo"the"

T%e re8ects due to ot%er t,pes o congestion i*e* Code$ CE and 5u)2 %ave )een monitored* 5n case o

an e+cessive load )ecause o t%e increased t%res%old2 actions are e+pected to )e triggered ), t%is

algorit%m*

5t is possi)le to increase t%e t%res%olds urt%er$ )ut I-. parameters also %ave to )e modi&ed to do so

)ecause o parameter relation2

Results6

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c) &% CE .tm7aton

CE congestions are mostl, on uplink as on do'nlink t%e dedicated .ac%s element processes

(S-PA trac*

As per (ua'ei eJuipment speci&cations$ one Resource Group can support ? cells$ or S333 sites$

cells %ave to )e divided into ! Groups* CE resources canLt )e s%ared )et'een diferent plink

Resource Groups$ so t%ere is a possi)ilit, t%at one group is congesting and anot%er one is not

ull, utilized* 1urt%ermore$ as congestions are onl, pegged during admissionF stage$ so itLs

possi)le t%at t%e overall 7ode> CE utilization is not %ig% )ut t%e CE congestions are seen due to

data service )e%avior resource is al'a,s reserved or eac% user2*

Norst perorming cells in PP#!6

Top 3 sites are alread, con&gured 'it% =BN>>P$ )ut onl, one or 13* .an, congestions are seen

on 13 cells* 5t is recommended to move one N>>P to Group# con&guration2*RE- Iine6 plink resource group recon&guration



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GREE7 Iine6 -isa)le cell level CE CAC

Ater plink resource group ad8ustment$ congestions moved rom 13 to 1#01! even more2* T%e

root cause is still t%at t%e diferent uplink resource groups canLt )e s%ared*

-isa)ling Cell level credit CE2 CAC 7ode> level CE CAC still valid2$ CE congestion reduced*

T%e grap% a)ove s%o's ver, lo' CE utilization or t%ese sites*

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Conclusion6

1or =BN>>P sites$ disa)ling cell level CE CAC is a )etter solution*

T%e I CE congestion canLt )e cleared ater disa)ling cell level CAC as 7ode> level CE CAC is

still valid*

Some ot%er eatures and unctions can )e considered to reduce CE congestion$ suc% as 1ast

-ormanc,$ (SPA TT5 recon&gurations and (SPA G>R ad8ustment*

(SPA G>R Ad8ustment6

T%e main contri)utor to t%e uplink CE congestion is (SPA trac*

According to t%e statistics$ t%e average (SPA t%roug%put per user is ="k)ps*

T%e G>R Guaranteed >it Rate2 or (SPA is ?=k)ps in live net'ork$ so some resources are

'asted or admission* G>R is onl, used or admission control$ users can get %ig%er t%roug%put via -CCC -,namic

C%annel Con&guration Control2

Recommendation6 C%ange t%e (SPA G>R rom ?=k)ps to 3!k)ps*

Iess PS congestions ater G>R c%anged rom ?=k)ps to 3!k)ps*

d) Enable


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Recommendation6

Ena)le -R- ailure roll)ackF unction to avoid some RA> setup ailures*

..I command6

SET URRCTRLSWITCH:PROCESSSWITCH2=RNC_RBRECFG_DRD_FAIL_ROLLBACK_SWITCH-

1&RNC_RBSETUP_DRD_FAIL_ROLLBACK_SWITCH-1;

-escription6

RNC_RBRECFG_DRD_FAIL_ROLLBACK_SWITCH R> Recon&guration -R- Roll)ack S'itc%26

N%en t%e s'itc% is turned on$ t%e R7C supports roll)ack caused ), ailed -R-s o R>

recon&guration* N%en t%e s'itc% is turned of$ t%e R7C does not support roll)ack caused ), ailed

-R-s o R> recon&guration*

RNC_RBSETUP_DRD_FAIL_ROLLBACK_SWITCH R> Esta)lis%ment -R- Roll)ack S'itc%2 6N%en t%e s'itc% is turned on$ t%e R7C supports roll)ack caused ), ailed -R-s o R>

esta)lis%ment* N%en t%e s'itc% is turned of$ t%e R7C does not support roll)ack caused ), ailed

-R-s o R> esta)lis%ment*

>enc%mark on PP#!6

Slig%t improvement on PS RA> Setup Success Rate



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#$2 PS %DR &pti'i(ation

#$2$1 ntroduction

>esides o some R1 design issues$ t%ere are t'o main contri)utors to t%e PS Call -rop Rate in live

net'ork6

1AC( Congestion 4 causing PS Call -rops on Common c%annels

Correlation )et'een PS CC( drop rate and 1AC( congestion6

13 idle )arred strateg,

As CellQ1AC( and CellQPC( is ena)led$ i 13 is idle )arred$ '%en E transit to CellQ1AC( on

13$ it 'ill reselect )ack to 1#01! S5>#! is not ena)led2* Pingpong reselections )et'een

diferent la,ers increase t%e possi)ilit, o drops$ negativel, impact su)scri)erLs perception

as 'ell*

#$2$2 .)%H %ongestion

As deault$ onl, one SCCPC( Secondar, Common Control P%,sical C%annel2 is con&gured or eac%

cell* Paging c%annel PC(2 and 1AC( are mapped onto t%e same p%,sical c%annel SCCPC( as per 3GPP

speci&cations* And$ PC( %as %ig%er priorit, to occup, t%is c%annel comparing 'it% 1AC(* To e+pand

1AC( capacit,$ !ndSCCPC( dedicated or 1AC( is recommended*

!nd

SCCPC( addition %as alread, )een rolled out in entire net'ork*

#$2$" ." Strategy /odiication

Current 13 Strateg,6



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Randoml, camping on 1#01!

13 is idle )arred

-R- algorit%m )ased on ser 7um)er

Ioad )ased )lind %andover )et'een diferent la,ers

Proposed Strateg, or PP#! noncontinuous 13 ootprint26

C%ange rom 13 )arred to inclined camping on 1#01! in case 13 is not continuous*

Set a )ig Mofset! )et'een 1#$1!2 0 13 to make idle E mainl, camp on 1#01! to reduce t%e

mo)ilit, CS drops on 13*

5nclined camping on 1#01!

13 is not idle )arred

-R- algorit%m )ased on ser 7um)er Ioad )ased )lind %andover )et'een diferent la,ers

>enc%mark or 13 strateg, modi&cation6

5mprovement on 13 PS C-R ater implementation rom #*D to #*3D2



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As or t%e areas 'it% continuous 13 ootprint suc% as SGS region$ t%e proposed strateg, is6

Randoml, camping on 1#01!013

13 is not idle )arred -R- algorit%m )ased on ser 7um)er

Ioad )ased )lind %andover )et'een diferent la,ers

#$" PS rougput &pti'i(ation

#$"$1 .unda'ental %ec

5tems6

(S-PAH(SPA unction s%ould )e activated* ?=MA.$ -o'nlink En%anced Ia,er!$ -ualCarrier (S-PA s%ould )e activated*

#$"$2 R3P &pti'i(ation

T%ese section onl, targets at %ig% RTNP caused ), %ig% trac$ a)normalities caused ), e+ternal

intererence$ engineering issues need speci&c inspections*

a) ack*"ound $ose Al*nmentAs deault$ t%e )ackground noise is ?#$ '%ic% means ##!:?#H#"#"m*



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As deault$ t%e ma+imum target load is ; lit*

nder t%ese settings$ '%en RTNP#"m:?d>*d>m$ t%e uplink load %as alread,



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reac%ed ma+imum load target* ConseJuentl,$ t%e (SPA t%roug%put canLt )e sc%eduled more* 5n

t%e live net'ork during t%e peak %ours$ man, RTNP spikes can e+ceed t%is value '%ic% are causing

lo' (SPA t%roug%put*

T%is activit, is to align t%e con&gured )ackground noise 'it% actual RTNP* Ne can regard t%e

minimum RTNP during t%e earl, morning "!%"""3%""2 as real )ackground noise*

b) C(# Feedback !e"od .tm7aton

.ore and more (S-PA connections are active according to t%e trac gro't% trend* (S-PA uplink

eed)ack c%annel (S-PCC( generated a )ig part o uplink intererence '%ic% limits t%e uplink

capacit, and (SPA t%roug%put as 'ell*

(ua'ei Ia) test result6

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(ig%est (S-PA ser 7um)erF vs .ean RTNPF in PP#!6 (ig% RTNP caused ), (S-PA trac*

Recommendation6Prolong CM5 1eed)ack periodF rom !ms to @ ms

Pros6

5mprove t%e RTNP$ uplink capacit, and (SPA t%roug%put

Cons6

(S-PA sc%eduling 'ill )e slo'er in ast ading scenario

..I command6

ADD UCELLHSDPCCH:CELLID=11111,CQIFBCK=D8,CQIFBCKFORSHO=D8;

>enc%mark or CM5 eed)ack period c%ange on PP#!6

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A)out 3d> improvement on average RTNP during peak %ours$ '%ic% means 'e %ave almost


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Parameter -escription6

M PRAC(PARAS

!a"amete" #D Constantvalue

!a"amete" $ame Constant /alue or Calculating 5nitial TU Po'er

$E >SC?""

MM% Command MD &!'AC9&&!A'A

Meann* T%is parameter speci&es a constant used at calculation o t%e initial transmit po'er o t%e &rst

pream)le$ to )e used in t%e random access procedure* T%e ormula is as ollo's6

Pream)leQ5nitialQPo'er Primar, CP5C( -I TU po'erCP5C(QRSCP : I intererence :

Constant /alue* N%ere$ Pream)leQ5nitialQPo'er is t%e pream)le initial TU po'er$ Primar,

CP5C( -I TU po'er is t%e do'nlink transmit TU2 po'er o PCP5C($ CP5C(QRSCP is t%e receive

signaling code po'er o t%e PCP5C( measured ), Es$ and I intererence is t%e uplink

intererence* 1or detailed inormation o t%is parameter$ reer to 3GPP TS !


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Actual alue 'an*e 3SC?"" /""R"##

Att"bute Radio

M PRAC(PARAS

!a"amete" #D Pream)leRetrans.a+

!a"amete" $ame .a+ Pream)le Retransmission

$E >SC?""


Meann* T%e ma+imum num)er o pream)les transmitted in a pream)le ramping c,cle* 1or detailed

inormation o t%is parameter$ reer to 3GPP TS !


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Featu"e #D NR1-"!"


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Security Level

!a"amete" #D Po'erRampStep

!a"amete" $ame Po'er 5ncrease Step

$E >SC?""


Meann* T%e po'er ramp step o t%e random access pream)les transmitted )eore t%e E receives t%e

acJuisition indicator in t%e random access process* 1or detailed inormation o t%is parameter$

reer to 3GPP TS !

Actual alue 'an*e #@

Default alue !

'ecommended alue !

#m.act Cell

!a"amete"

'elatonsh.

7one

Access Read 0 Nrite

e"3ce #nte""u.ted

Afte" Mod4caton

7o


#nte""u.ton

Du"aton5Mn)

7ot involved

Cauton 7one

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Security Level

aldaton of

Mod4caton


#m.act on 'ado

$et6o"k !e"fo"mance

5 t%e value o Po'er ramp step is too large$ t%e access procedure 'ill )e s%ortened$ )ut it is

more likel, to cause po'er 'aste* 5 it is too small$ t%e access procedure 'ill )e e+tended in

time$ )ut transmit po'er resources 'ill )e saved* T%is parameter must )e set careull,* 5n

addition$ t%e %ig%er t%e parameter value is$ t%e smaller impact Constant /alue or

Calculating 5nitial TU Po'er %as on t%e net'ork perormance*

#nt"oduced n e"son /ersions earlier t%an >SC?"" /""R"##

Att"bute Radio

>enc%mark6



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Signi&cant RTNP improvement on (ig% RRC Attempts sites$ (SPA t%roug%put improved

as 'ell* 7o degradation on RRC Setup Success Rate*

d) Ada.t3e ! fo" 9&!A T"a>c Channel

Current (SPA po'er parameter con&guration is more reasona)le or %ig% speed transmission$

in order to adapt to t%e scenario 'it% man, lo' t%roug%put online users$ t%is eature ena)les

t%e R7C to con&gure an optimal po'er ofset or (SPA #" ms TT5 Es 'it% a small target

num)er o retransmissions )ased on t%e rate o t%e Es*

5 t%e data rate is lo'er t%an 3"" k)itHs$ a large po'er ofset o E-P-C( and -PCC( can )e

con&gured* Con&guring a larger ofset decreases po'er on t%e -PCC( and reduces po'er

consumption on t%e uplink control c%annel* 5n t%is 'a,$ more po'er can )e used to transmit

user data in t%e uplink$ t%ere), increasing capacit, o (SPA cells*

5 t%e data rate is %ig%er t%an 3"" k)itHs$ a lo' po'er ofset o E-P-C( and -PCC( can )e

con&gured* Con&guring a smaller ofset increases po'er on t%e -PCC($ t%ere), meeting po'er

reJuirements in cases o multipat% searc%ing and c%annel assessment and improving

perormance o (SPA services*

..I command6

SET UCORRALGOSWITCH: P!S"#$!%=PC_HSUPA_DATA_CH_PO_ADAPTIE_AD'_SWITCH-1;

>enc%mark6



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Security Level

7o o)vious improvement on statistics$ as t%e main gain is o)tained '%en t%e (SPA

t%roug%put is greater t%an 3""k)ps as per t%e eature description* 5n t%e live net'ork$ t%is

scenario could %ave a small proportion* 1ield (SPA test s%ould )e getting more )ene&t*

#$"$" %P )ccelerator

T%e Transmission Control Protocol TCP2 is a relia)le transport la,er protocol to provide relia)le

endtoend streams o ),tes or t%e 5nternet* 5t is 'idel, used in email and &le transer services*

T%e TCP 'as initiall, designed or 'ired communications*

Ater t%e TCP is introduced in 'ireless communications$ t%e original TCP mec%anism cannot 'ell

adapt to t%e 'ireless net'orkVs c%aracteristics suc% as %ig% )it error rate and long dela,$ '%ic%

leads to dissatisactor, transmission perormance* To improve t%e perormance$ t%e TCP

Perormance En%ancer TPE2 is introduced* T%e TPE is also kno'n as TCP accelerator or TCP

pro+,*

T%e TPE is a unctional entit, in t%e R7C* 5t 'orks as a pro+, )et'een t%e sender and t%e

receiver* 5t )ufers and processes data to accelerate data transmission and to improve

transmission perormance* T%e position o t%e TPE entit, on t%e TCP connection is s%o'n as

)elo'*

5n uplink transmission$ t%e server is t%e receiver and t%e E is t%e sender* 5n do'nlink

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transmission$ t%e E is t%e receiver and t%e server is t%e sender*

T%e TPE 'orks independentl, o ot%er net'ork elements 7Es2*

T%e TPE must )e implemented )eore Packet -ata Convergence Protocol P-CP2 %eader

compression*

Ater t%e TPE unction is activated$ onl, t%e ne' TCP connections can )ene&t rom t%e eature*

TCP Terms6

Te"m De4nton

.SS T%e ma+imum segment size .SS2 is t%e largest amount o data e+cluding TCP %eaders2 sent

t%roug% TCP rom t%e source end to t%e peer end in a single segment* T%e .SS is negotiated

'%en a TCP connection is esta)lis%ed )et'een t'o ends*

Receive

'indo'

T%e receive 'indo' (")*or s%ort2 speci&es t%e largest amount o data t%at can )e received

), t%e receiver*

Congestion

'indo'

T%e congestion 'indo' !")*or s%ort2 limits t%e total amount o data t%at can )e sent ), a

TCP connection* 5t reJuentl, c%anges t%roug%out t%e communication process o t%e TCP

connection*

Ofered'indo'

T%e ofered 'indo' indicates t%e largest amount o data t%at can )e received at a moment ),t%e receiver* 5t is used to limit t%e largest amount o unackno'ledged data allo'ed ), t%e

sender*

Send

'indo'

T%e send 'indo' indicates t%e largest amount o data t%at can )e sent ), t%e sender at a

moment* 5t is eJual to t%e minimum value o !")*and ofered 'indo'*

Slo' start

t%res%old

N%en !")*is larger t%an or eJual to t%e slo' start t%res%old ++$%(+%or s%ort2$ t%e TCP

connection enters t%e congestion avoidance p%ase*

RTT T%e round trip time RTT2 is t%e time during '%ic% t%e sender sends a packet to t%e receiver and

t%e receiver returns an ackno'ledgement ACK2*

-upACK T%e duplicate ackno'ledgement -upACK2 is an ACK '%ose seJuence num)er is t%e same as

t%at o t%e previous ACK* N%en packet misordering or packet loss occurs during transmission$

t%e receiver responds t%e sender 'it% a -upACK*

TCP Reno

-ata can )e transmitted in seJuence onl, ater a TCP connection is esta)lis%ed t%roug% t%ree

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%ands%akes* -uring t%e transmission$ congestion is controlled t%roug% transmission rate

ad8ustment* T%e ad8ustment is )ased on t%ree varia)les6 c'nd$ r'nd$ and sst%res%* N%en t%e

sender detects packet loss due to retransmission timeout or repeat reception o -upACK$ it

ad8usts t%e transmission rate*

T%e TCP Reno is t%e most 'idel, used TCP protocol version* 5t consists o our p%ases6 slo' start$

congestion avoidance$ ast recover,$ and ast retransmission* (ere$ assume t%at sst%res% is set

to ?= K>*

Slo' start and congestion avoidance6

1ast retransmission and ast recover,6

5n t%e slo' start p%ase$ c'nd is set to t%e t'o times t%e .SS* Eac% time an ACK is received$ t%e

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value o c'nd is incremented ), one .SS unit6 ),te2* 5n addition$ t%e TCP connection maintains

t%e t%res%old sst%res%* N%en t%e value o c'nd reac%es t%is t%res%old$ t%e TCP connection

enters t%e congestion avoidance p%ase*

RTT Timeout

5n t%is case$ t%e sender sets sst%res% to ma+ Wc'nd H!$ ! + .SSX and t%en sets c'nd to ! +

.SS* T%e TCP connection enters t%e slo' start p%ase again*

Repeat reception o -upACK

5n t%is case$ t%e TCP connection enters t%e ast retransmission and ast recover, p%ases* T%e

sender sets sst%res% and c'nd to ma+ Wc'ndH!$ ! + .SSX* Eac% time a -upACK is received$ t%e

value o c'nd is incremented ), one .SS* T%is process is accomplis%ed until t%e retransmitted

packets are received* T%en$ t%e sender sets c'nd to t%e value o sst%res%* T%e TCP connection

enters t%e congestion avoidance p%ase again*

TPE Tec%nologies

T%e TPE module unction is in t%e R7C* N%en esta)lis%ing a TCP connection$ t%e TPE module

sets up a TPE entit, or t%e TCP connection to process TCP packets* 5n uplink transmission$ t%e

server is t%e receiver and t%e E is t%e sender* 5n do'nlink transmission$ t%e E is t%e receiver

and t%e server is t%e sender*

5n do'nlink transmission$ t%e TPE adopts t%e ollo'ing tec%nologies to improve t%e

transmission perormance6

ACK Splitting

-upACK -uplication

-o'nlink Packet Sorting

5n uplink transmission$ t%e TPE adopts tec%nologies suc% as ACK SplittingF and plink

Packet SortingF* T%e 'orking principles o uplink transmission are t%e same as t%ose o

do'nlink transmission*

ACK Splitting6

5n TCP$ t%e congestion 'indo' is updated according to t%e num)er o received ACK messages

and is e+panded ), increasing t%e num)er o ACK messages* N%en a slo' startup occurs at t%e

transmitting end$ ACK splitting can Juickl, recover t%e congestion 'indo'Y '%en t%e

transmitting end 'orks in congestion avoidance mode$ ACK splitting can accelerate t%e

http://127.0.0.1:52199/hedex/pages/GEA0509R/02/GEA0509R/02/resources/FPD/TPE.htm?ft=99&id=GEA0509R_02_10068&keyword=tcp#_Ref271201504http://127.0.0.1:52199/hedex/pages/GEA0509R/02/GEA0509R/02/resources/FPD/TPE.htm?ft=99&id=GEA0509R_02_10068&keyword=tcp#_Ref249242280http://127.0.0.1:52199/hedex/pages/GEA0509R/02/GEA0509R/02/resources/FPD/TPE.htm?ft=99&id=GEA0509R_02_10068&keyword=tcp#_Ref249242272http://127.0.0.1:52199/hedex/pages/GEA0509R/02/GEA0509R/02/resources/FPD/TPE.htm?ft=99&id=GEA0509R_02_10068&keyword=tcp#_Ref249242281http://127.0.0.1:52199/hedex/pages/GEA0509R/02/GEA0509R/02/resources/FPD/TPE.htm?ft=99&id=GEA0509R_02_10068&keyword=tcp#_Ref249242281http://127.0.0.1:52199/hedex/pages/GEA0509R/02/GEA0509R/02/resources/FPD/TPE.htm?ft=99&id=GEA0509R_02_10068&keyword=tcp#_Ref271201504http://127.0.0.1:52199/hedex/pages/GEA0509R/02/GEA0509R/02/resources/FPD/TPE.htm?ft=99&id=GEA0509R_02_10068&keyword=tcp#_Ref249242280http://127.0.0.1:52199/hedex/pages/GEA0509R/02/GEA0509R/02/resources/FPD/TPE.htm?ft=99&id=GEA0509R_02_10068&keyword=tcp#_Ref249242272http://127.0.0.1:52199/hedex/pages/GEA0509R/02/GEA0509R/02/resources/FPD/TPE.htm?ft=99&id=GEA0509R_02_10068&keyword=tcp#_Ref249242281http://127.0.0.1:52199/hedex/pages/GEA0509R/02/GEA0509R/02/resources/FPD/TPE.htm?ft=99&id=GEA0509R_02_10068&keyword=tcp#_Ref249242281


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Security Level

e+pansion o t%e congestion 'indo'*

-upACK -uplication6

5n TCP$ a lost TCP packet is retransmitted ater t%ree -upACK are received* Nit% t%is eature$

ater t%e TPE receives t%e ACK message rom t%e E$ t%e TPE immediatel, duplicates t%ree

-upACK messages and sends t%em to t%e Server i it detects t%at t%e packets reJuested ), t%e

ACK are not in t%e )ufer* T%is s%ortens t%e time or packet retransmission*

-o'nlink Packet Sorting6

T%e TPE sorts and transmits t%e disordered -I packets to avoid unnecessar, transmission o

-upACKs in t%e uplink and to prevent TPE local retransmission caused ), disordered packets* 5n

t%is 'a,$ transmission resources are saved*

plink Packet Sorting6

T%e TPE sorts t%e I packets and transmits t%em to t%e core net'ork C72 in seJuence* T%is

avoids t%e deterioration o t%e I data transmission perormance caused ), t%e disordered I

packets*

TCP Accelerator 'as ena)led on !"

t%

Zune* Slig%t improvement is seen on t%roug%putstatisticall,*

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#$"$# %4 )d5ust'ent ased on Dyna'ic L7R arget

Nit%out t%is eature$ t%e 7ode> determines a transmission )lock size T>S2 )ased on t%e c%annel

Jualit, indicator CM52 reported ), t%e E$ s,stem resources$ and t%e transport ormat and resource

com)ination T1RC2 polic,* 5 t%e reported CM5 and related conditions remain t%e same$ t%e 7ode>

does not c%ange t%e T>S )ecause it does not consider t%e everc%anging radio environments* T%e

constant c%anges in radio environments$ caused ), multipat% efects and E mo)ilit,$ lead to

[uctuating c%annel Jualit,* nder t%ese circumstances$ c%oosing a T>S )ased on t%e reported CM5

makes it dicult to al'a,s ac%ieve t%e optimum do'nlink t%roug%put*

Nit% t%is eature$ t%e 7ode> monitors t%e c%annel Jualit, [uctuations or (S-PA users in a cell in

real time and d,namicall, selects a proper >IER target )ased on t%e monitoring result* T%e 7ode>

t%en uses t%e >IER target to ad8ust t%e CM5 reported ), t%e E* >ased on t%e ad8usted CM5$ t%e

7ode> determines an appropriate T>S to ac%ieve %ig%er do'nlink t%roug%put or (S-PA users and

%ig%er cell t%roug%put*

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Security Level

7ote6 T%is eature needs 7ode> license support*

#$"$* HS8P) )daptive Re-rans'ission

(ARM retransmission num)er is used as t%e target value o (SPA uplink outer loop po'er control*

N%en E signal Jualit, is good and uplink transmission po'er is not limited$ a small retransmission

can improve single user t%roug%put* (o'ever$ '%en capacit, is limited and cell uplink po'er

)ecomes a )ottleneck$ increasing retransmission num)er can improve cell t%roug%put* 5ncreasing

retransmission num)er can also )oost user cell edge t%roug%put$ '%ere E uplink po'er is limited*

T%ereore t%ereLs a need to realize t%e adaptive ad8ustment o retransmission num)er*

Nit% compre%ensive considerations o cell uplink po'er load$ CE resources$ and limited uplink

coverage$ t%is eature ena)les t%e adaptive ad8ustment o t%e num)er o target uplink

retransmissions to improve t%e t%roug%put per user and cell uplink capacit,*

Pros6

5n a limited uplink coverage scenario$ a userLs uplink cell edge t%roug%put can )e increased$ in

order to en%ance user e+perience* According to simulation results$ single user t%roug%put %as )een

s%o' to increase ), #


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Security Level

improve cell t%roug%put and cell uplink capacit,* Simulation results %ave s%o'n an increase o ..I command e+ecute on all t%e 7ode>s under PP#!2

SET A-PRETRA7SSNTC(6 SN5TC( OPE7Y

5 Smart Phone Optimization

*$1 7nanced .ast Dor'ancy

Some intelligent Es on a live net'ork send a Signaling Connection Release 5ndication SCR52

message to t%e R7C ater PS data transmission is complete* >, sending t%e SCR5 message$

intelligent Es reJuest or a transition to idle mode or t%e CEIIQPC( or RAQPC( state to reduce

)atter, consumption* pon receiving t%e SCR5$ t%e R7C can release t%e signaling connection and

put t%e E into idle mode$ or t%e R7C can maintain t%e signaling connection and put t%e E to

CEIIQ1AC( or CEIIQPC(HRAQPC( state* RS/->5T#Q>5T! o t%e RsvdPara# parameter in t%e SET

RRCTRISN5TC( command controls t%e E t%roug% CEIIQ1AC( to CEIIQPC(HRAQPC( or directl, to

CEIIQPC(HRAQPC(* T%ese procedures can reduce )atter, consumption$ depending on t%e E

capa)ilit, and eature activation on t%e R7C* >, deault$ t%e R7C puts t%e E into idle mode* A E

setting up PS services in idle mode consumes more signaling resources t%an t%at in t%e CEIIQPC(

or RAQPC( state* 5 t%ere are a large num)er o Es transited )et'een idle mode and CEIIQ-C(

state$ signaling storms ma, occur* T%e E1- eature puts Es into t%e CEIIQ1AC( or CEIIQPC( state

to reduce signaling resource consumption and eliminate signaling storms*

(ua'ei provides a compre%ensive endtoend solution )ased on net'ork c%aracteristics to respond

to net'ork c%allenges* E1- is one component o t%e solution* T%is eature alone is not enoug% to

eliminate signaling storms caused ), intelligent Es* (o'ever$ '%en applied 'it% proessional

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Security Level

services$ E1- can )e used to optimize t%e Jualit, o service MoS2 or t%e entire net'ork*

T%e Es on a live net'ork can )e divided into t%ree t,pes6

Es t%at do not send SCR5 messages )ecause t%ere is no PS data to )e transmitted*

Pre ast dormanc, Es* T%is t,pe o E does not read t%e T3!3 inormation element 5E2 carried in

t%e s,stem inormation )lock t,pe # S5>#2 message* Ater PS data transmission is complete$ t%is

t,pe o E sends an SCR5 message to t%e R7C$ )ut t%e SCR5 message does not carr, t%e 5E

Signaling Connection Release 5ndication Cause* >ot% T3!3 and Signaling Connection Release

5ndication Cause are introduced in 3GPP Release @*

R@ ast dormanc, Es* T%is t,pe o E reads t%e T3!3 5E carried in t%e S5># message and sends an

SCR5 message to t%e R7C ater PS data transmission is complete* T%e SCR5 message carries t%e 5E

Signaling Connection Release 5ndication Cause t%at is set to E ReJuested PS -ata session end*

T%e T3!3 5E carried in t%e S5># message controls t%e reJuenc, at '%ic% t%e R@ ast dormanc, Es

send SCR5 messages 'it% t%e 5E Signaling Connection Release 5ndication Cause set to E

ReJuested PS -ata session end* T%e T3!3 timer starts ater an SCR5 message is sent ), t%e R@

ast dormanc, Es$ and t%e second SCR5 message 'it% t%e 5E Signaling Connection Release

5ndication Cause set to E ReJuested PS -ata session end can )e sent onl, ater t%e T3!3 timer

e+pires*

T%e E1- eature applies onl, to t%e pre ast dormanc, Es and R@ ast dormanc, Es* sers can

con&gure E1- to )e ena)led or onl, t%e pre ast dormanc, Es or R@ ast dormanc, Es*

N%en t%is eature is disa)led$ t%e R7C releases t%e signaling connection and puts t%e E into idle

mode ater receiving t%e SCR5 message regardless t%e E t,pes*

N%en t%is eature is ena)led$ t%e R7C perorms diferent processing )ased on t%e E t,pe6

1or t%e pre ast dormanc, Es$ t%e R7C c%ecks or compati)ilit, issues ater receiving an SCR5

message* 5 t%ere are no compati)ilit, issues$ t%e R7C puts t%e E into t%e CEIIQ1AC( or PC(

state* 5 t%ere is a compati)ilit, issue$ t%e R7C puts t%e E into idle mode*

1or t%e R@ ast dormanc, Es$ t%e R7C puts t%e E into t%e CEIIQ1AC( or PC( state ater receiving

an SCR5 message*

7ote6



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Security Level

Some pre ast dormanc, Es ma, %ave compati)ilit, issues ater moving to t%e CEIIQ1AC($

CEIIQPC($ or RAQPC( state* As a result$ ne' services cannot )e initiated* T%is eature %as )een

tested ), using iP%ones and no compati)ilit, issue occurred*

N%en t%ere is no PS data to )e transmitted$ t%e intelligent E sends t%e R7C an SCR5 message to

reJuest t%e TRA7 to release t%e signaling connection* T%is procedure saves po'er* 5n addition$ t%e

E periodicall, sends %eart)eat messages to t%e core net'ork$ or e+ample$ to c%eck or ne' mails

on t%e mail server* 5 t%e E1- eature is disa)led$ t%e R7C releases t%e signaling connection and

puts t%e E into t%e idle state* 5n t%is case$ sending %eart)eat messages leads to t%e procedures

or RRC connection setups$ aut%entication$ encr,ption$ and RA> setups* T%ese procedures increase

t%e R7C signaling processing load*

E1- addresses t%is pro)lem* Nit% E1-$ t%e R7C transits a E to t%e CEIIQ1AC( or PC( state

instead o idle mode upon receiving an SCR5 message rom t%e E* 5n t%is case$ '%en t%e E

periodicall, sends %eart)eat messages$ t%e signaling procedure )et'een t%e E and R7C is

simpli&ed )ecause t%e RRC connection is maintained* As t%e num)er o signaling e+c%ange

messages decreases$ signi&cant CP resources can )e saved or t%e R7C$ and t%e E consumes

a)out t%e same lo' amount o )atter, po'er as a E in idle mode*

Signaling processing procedures or pre ast dormanc, Es and R@ ast dormanc, Es )eore and

ater E1- is ena)led



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Security Level

5denti,ing 1ast -ormanc, Es

T%e R7C identi&es t%e pre ast dormanc, Es and R@ ast dormanc, Es using t%e ollo'ing

mec%anisms6

R@ ast dormanc,6 T%e T3!3 parameter t%at can )e set in t%e SET CO77.O-ET5.ER

command is sent to t%e E ), t%e S5># message* T%e R@ ast dormanc, Es send an SCR5

message 'it% t%e 5E Signaling Connection Release 5ndication Cause set to E ReJuested PS

-ata session end ater PS data transmission is complete* T%e R7C identi&es t%e R@ ast

dormanc, Es ), reading t%e value o 5E Signaling Connection Release 5ndication Cause*

T%is mec%anism is standardized ), 3GPP Release @*

Pre ast dormanc,6 T%e R7C identi&es t%e pre ast dormanc, Es using t%e T,pe Allocation

Codes TACs2* T%is mec%anism$ '%ic% is not standardized$ is used or t%e earl, proprietar,

implementations o ast dormanc,*

T%e international mo)ile eJuipment identit, 5.E52$ '%ic% consists o #= decimal digits and one

c%eck digit$ contains TAC and S7R* TAC indicates a particular t,pe o device t%at %as )een approved

), a national GS.HNC-.A approval )od,* S7R is t%e serial num)er identi,ing t%e E* T%e

structure o t%e 5.E5$ '%ic% is s%o'n as ollo's$ is speci&ed in 3GPP TS !3*""3*

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To identi, pre ast dormanc, Es$ 1-QTACQ.ATC(QSN5TC( o t%e PROCESSSN5TC( parameter on

t%e R7C side needs to )e turned on* T%e TAC parameter %as )een set or t%e pre ast dormanc, Es

), t%e A-- 5.E5TAC command* T%e R7C c%ecks t%e TAC o t%e 5.E5 in t%e 5-E7T5T REMEST

message* 5 t%e TAC is included in t%e E1- list$ t%e E can use E1-*

State Transition or 1ast -ormanc, E

N%en E1- is disa)led$ upon receiving an SCR5 message rom a E$ t%e R7C releases t%e ELs RRC

connection* T%e E1- s'itc%es are speci&ed ), t%e R7Clevel su)parameter

FAT?D'MA$C@?#TC9o t%e parameter !'CE#TC9

N%en E1- is ena)led$ state transition procedures var, according to t%e E t,pe as ollo's6

1or R@ ast dormanc, Es and pre ast dormanc, Es in E1- list6

- 5 t%e R7C received t%e SCR5$ T%e R7C transers t%e E to CEIIQ1AC( or CEIIQPC(HRAQPC(* T%e

'D#T1?#T2Bsu)parameter o t%e 's3d!a"a1parameter in t%e SET URRCTRLSWITCH

command controls '%et%er t%e E moves to CEIIQ1AC( or CEIIQPC(HRAQPC(*

- Ater PS data transmission is complete$ 5 E is in CEIIQ-C($ t%e PS inactivit, timer

!s#nactTm"Fo"FstD"mDch2 or E1- in CEIIQ-C( is started* 5 t%e PS inactivit, timer or E1- in

CEIIQ-C( e+pires$ t%e R7C transers t%e E to CEIIQ1AC( or CEIIQPC(HRAQPC(*

- Ater PS data transmission is complete$ 5 E is in CEIIQ1AC($ t%e PS inactivit, timer

!s#nactTm"Fo"FstD"mFach2 or E1- in CEIIQ1AC( is started* 5 t%e PS inactivit, timer or E1- in

CEIIQ1AC( e+pires$ t%e R7C transers t%e E to CEIIQPC(HRAQPC(*

- 5 E is transerred to CEIIQPC(HRAQPC($ t%e PS inactivit, timer !s#nactTm"Fo"!"eFstD"m2 is

started* 5 t%e PS inactivit, timer or E1- in CEIIQPC( e+pires$ t%e R7C transers t%e E to 5-IE*

- 5 E is in CEIIQPC(HRAQPC( and %as somet%ing to send and t%e condition or P!- is not satis&ed$

t%e R7C instructs t%e E to enter t%e CEIIQ1AC( state*

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- 5 E is in CEIIQ1AC( and send messages '%ose trac volume is %ig%er t%an

FastDo"manc,F2D9T3mThd$ T%e R7C 'ill transer t%e E rom CEIIQ1AC( to CEIIQ-C(*

- N%en t%e s'itc% 'D#T1?#T20o 's3d!a"a1in t%e SET URRCTRLSWITCHcommand is turned

on and t%e E tries to originate or terminate a CS service and t%e 1AC( is congested$ t%e R7C

instructs t%e E to perorm a P!- instead o P!12 state transition*

- N%en t%e s'itc% FAC9?DTC9?C$/ET?!2Do !'CE#TC92in t%e SET

URRCTRLSWITCHcommand is turned on and t%e E tries to originate or terminate a PS service

and t%e 1AC( is congested$ t%e R7C instructs t%e E to perorm a P!- instead o P!12 state*

1or pre ast dormanc, Es not in E1- list6

- 5 t%e R7C received t%e SCR5$ t%e R7C transers t%e E to 5-IE state*

- T%e -!1H1!PHP!1H1!-HP!- state transition or pre ast dormanc, Es not in E1- list is t%e same to

ordinar, Es*

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Security Level

-ata con&guration or state transitions or a ast dormanc, E6

T,.e

Desc".ton

-!P

-!1

1!P

-!P indicates a transition rom CEIIQ-C( to CEIIQPC($ 1!P rom

CEIIQ1AC( to CEIIQPC($ and -!1 rom CEIIQ-C( to CEIIQ1AC(*

T%e R7C starts t%e PS inactivit, timer or ast dormanc, '%en inactivit, on

PS data is detected*

!s#nactTm"Fo"FstD"mDchspeci&es t%e PS inactivit, timer or

CEIIQ-C(*

!s#nactTm"Fo"FstD"mFachspeci&es t%e PS inactivit, timer or

CEIIQ1AC(*- !s#nactTm"Fo"!"eFstD"mspeci&es t%e PS inactivit, timer or CEIIQPC(*

5 t%e E is a ast dormanc, E and is not processing CS services$ '%en t%e

PS inactivit, timer

or ast dormanc, e+pires or t%e R7C receives an SCR5 message or => event

rom t%e E$ t%e

E c%anges states as ollo's6

1) Fo" a &E n the CE%%?DC9 state:

\ 5 'D#T1?#T2Bo 's3d!a"a1in t%e SET URRCTRLSWITCH

command is turned of$

t%e R7C triggers a -!1 state transition*

\ 5 'D#T1?#T2Bo 's3d!a"a1in t%e SET URRCTRLSWITCH

command is turned on$

t%e R7C triggers a -!P state transition*

$ote:

T%e -!1 and 1!P state transitions are recommended or t%e ollo'ing reasons6

-uring an 5OT test$ some terminal issues occur* Occasionall,$ terminals ail to esta)lis% services

ater a transition rom CEIIQ-C( to CEIIQPC(HRAQPC(* T%is ailure %as a )ad impact on user

e+perience*

Compare 'it% a state transition rom CEIIQ-C( to CEIIQ1AC( and t%en to CEIIQPC(HRAQPC($

t%e state transition rom CEIIQ-C( to CEIIQPC(HRAQPC( does not improve t%e net'ork

perormance or user e+perience*

Some terminals send CEII P-ATE message to transer data immediatel, ater a state transition

rom CEIIQ-C( to CEIIQPC(HRAQPC($ '%ic% increases t%e signaling messages and leads to a

%eav, load on t%e u interace*

2) Fo" a &E n the CE%%?FAC9 state the '$C t"**e" an F2! state

t"anston



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-!5 -!5 indicates a transition rom CEIIQ-C( to idle*

N%en t%e 1AC( is congested$ -!1 is not triggered or inactive CEIIQ-C(

users* 5nstead$ t%e

R7C triggers a -!5 transition to release t%e EVs RRC connection* T%e s'itc%

or -!5 is turned of ), deault* Run t%e ollo'ing command to s'itc% it on6

SET UCORRMALGOSWITCH:

ReservedSwitch0=RESERVED_SWITCH_0_IT!"#!$

P!5 P!5 indicates a transition rom CEIIQPC( to idle*

5 t%e E is in t%e CEIIQPC( state$ '%en t%e PS inactivit, timer or ast

dormanc, speci&ed ),

!s#nactTm"Fo"!"eFstD"m2 e+pires$ t%e R7C releases t%e EVs RRC

connection and t%en t%eE enters idle mode*

P!- P!- indicates a transition rom CEIIQPC( to CEIIQ-C(*

N%en t%e s'itc% 'D#T1?#T20o 's3d!a"a1in t%e SET

URRCTRLSWITCH command is

turned on and t%e E tries to originate or terminate a CS service and t%e

1AC( is congested$ t%e R7C instructs t%e E to perorm a P!- instead o

P!12 state transition*

N%en t%e s'itc% FAC9?DTC9?C$/ET?!2Do !'CE#TC92in

t%e SET

&''CT'%#TC9command is turned on and t%e E tries to originate or

terminate a PS service and t%e 1AC( is congested$ t%e R7C instructs t%e E

to perorm a P!- instead o P!12 state transition*

P!1 P!1 indicates a transition rom CEIIQPC( to CEIIQ1AC(*

N%en t%e E %as somet%ing to send and t%e condition or P!- is not

satis&ed$ t%e R7C instructs t%e E to enter t%e CEIIQ1AC( state* 1or details

a)out conditions or P!-$ see a)ove P!- description*

1!- 1!- indicates a transition rom CEIIQ1AC( to CEIIQ-C(*

N%en a ast dormanc, E is in t%e CEIIQ1AC( state$ N%en t%e ast

dormanc, E sendsmessages '%ose trac volume is %ig%er t%an

FastDo"manc,F2D9T3mThd$ T%e R7C 'ill

transer t%e E rom CEIIQ1AC( to CEIIQ-C(* T%e

FastDo"manc,F2D9T3mThdis a ne'

t%res%old o event =a or ast dormanc, E$ T%is t%res%old is set to )igger

t%an trac volume o most %eart)eat messages so t%at to prevent state

transitions rom )eing triggered ), a small num)er o %eart)eat messages*

>enc%mark or PP#!6

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Security Level

A)out !"D reductions on RRC and RA> attempts$ '%ic% reduce t%e signaling load signi&cantl,

Iess congestions are o)served as 'ell*

*$2 /ulti-R) &pti'i(ation

T%e .ultiRA> mainl, or CS:PS2 services increased as smart p%one penetration is increasing*

T%e trend o .ultiRA> attempts in 7GA region6

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T%e live net'ork statistics s%o's t%at t%e Call -rop Rate in .ultiRA> scenario is muc% %ig%er

t%an single RA> service*

General cause o drop rate o .ultiRA> %ig%er t%an single CS RA>6

(ig%er R1 signal Jualit, reJuirement comparing 'it% CS Single RA>

.ore complicated signaling procedure comparing 'it% Single RA>

To improve t%e CS call drop6

Reduce t%e PS R1 signal Jualit, reJuirement or multiRA>

Reduce t%e loss pro)a)ilit, due to complicated signaling process*

Optimize t%e signaling procedures

#" parameter tunings 'ere rollout in 7P5 !"##$ some more activities are proposed in !"#!

!a"amete" Chan*e 5MM%) 'ema"k /?!!12?!!(?

$/A

SET CORR.AIGOSN5TC(6

ReservedS'itc%"RESER/E-QSN5TC(Q"Q>5T#

EPPERI5.5T1ORA.R-?=$ 5nitiative in 7P5 !"## -?=

SET 1RC6-I-C(>EPPERI5.5T1ORA.R-@Y 5nitiative in 7P5 !"## -@

SET RRCTRISN5TC(6

RsvdPara#Rsvd>it#Q>5T!?"Y

5nitiative in 7P5 !"## O11

SET STATET5.ER6R>SETPRSPT.R#""""Y 5nitiative in 7P5 !"## #""""

SET STATET5.ER6(OAST.R#""""Y 5nitiative in 7P5 !"## #""""

SET

STATET5.ER6(OP(C(REC1GT.R#""""Y

5nitiative in 7P5 !"## #""""

SET STATET5.ER6R>REC1GRSPT.R#""""Y 5nitiative in 7P5 !"## #""""

SET STATET5.ER6R>REIRSPT.R#""""Y 5nitiative in 7P5 !"## #""""

SET STATET5.ER6 5nitiative in 7P5 !"## #""""

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Security Level

(oCellpdateRspTmr#""""Y

SET RRCTRISN5TC(6

RsvdPara#Rsvd>it#Q>5T!""Y

5nitiative in !"#!6

N%en CellQ1ac%0PC( is ena)led$ avoid

CS RA> ailures caused ), t%e

procedure overlap )et'een cell update

and CS RA> esta)lis%ment

O11

SET RRCTRISN5TC(6

RsvdPara#Rsvd>it#Q>5T!#"Y

O11

Parameter -escription6

M CORR.AIGOSN5TC(

!a"amete" #D ReservedS'itc%"

!a"amete" $ame CORR. Algorit%m Reserved S'itc% "

$E >SC?""

MM% Command ET &C''MA%/#TC9

Meann* CORR. algorit%m reserved s'itc% "*

RESER/E-QSN5TC(Q"Q>5T##6 N%en t%e s'itc% is turned on$ t%e PS service must )e carried ),

-C(s in t%e uplink i )ot% CS and PS services e+ist*

RESER/E-QSN5TC(Q"Q>5T#5T##$ RESER/E-QSN5TC(Q"Q>5T#E service rate in com)ined A.R services*

Com)ined A.R services consist o onl, A.R services and >E services* 5 t%ere is a mem)er o

a diferent trac class$ t%e com)ined services are regarded as com)ined nonA.R services*

#s+e, 7O

Mandato", 7O

Featu"e #D 7one

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Security Level

Featu"e $ame 7one


/ alue 'an*e -@$ -#?$ -3!$ -?=$ -#!@$ -#==$ -!


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$E >SC?""

MM% Command ET &F'C

Meann* T%is parameter speci&es t%e upper limit o do'nlink >E service rate in com)ined A.R

services* Com)ined A.R services consist o onl, A.R services and >E services* 5 t%ere is a

mem)er o a diferent trac class$ t%e com)ined services are regarded as com)ined nonA.R

services*

#s+e, 7O

Mandato", 7O

Featu"e #D 7one

Featu"e $ame 7one


/ alue 'an*e -@$ -#?$ -3!$ -?=$ -#!@$ -#==$ -!


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Security Level

#m.act on 'ado

$et6o"k !e"fo"mance

7one


Att"bute Radio

M RRCTRISN5TC(

!a"amete" #D RsvdPara#

!a"amete" $ame Reserved parameter #

$E >SC?""

MM% Command ET &''CT'%#TC9

Meann* RS/->5T#Q>5T!" Reserved Parameter # >it !"2 N%en t%e s'itc% is turned on$ or Es t%at

support ast dormanc, and are in t%e CEIIQPC( state$ t%e R7C perorms t%e CEIIQPC(to

CEIIQ1AC( P!1 or s%ort2 procedure i t%e Es perorm cell update 'it% t%e cause value

uplink data transmission or paging response* N%en t%e s'itc% is turned of$ or Es t%at

support ast dormanc, and are in t%e CEIIQPC( state$ t%e R7C perorms t%e P!- procedure i

t%e Es perorm cell update 'it% t%e cause value uplink data transmission or paging

response*

RS/->5T#Q>5T!# Reserved Parameter # >it !#2 N%en t%e s'itc% is turned on$ or Es t%at are

esta)lis%ing A.R services and s%iting rom t%e CEIIQ1AC( state to t%e CEIIQ-C( state$ t%e

R7C stops esta)lis%ing A.R services to %andle cell update i t%e R7C receives rom t%e Es a

cell update message containing t%e cause value cell reselection* N%en t%e s'itc% is turned

of$ or Es t%at are esta)lis%ing A.R services and s%iting rom t%e CEIIQ1AC( state to t%e

CEIIQ-C( state$ i t%e R7C receives rom t%e Es a cell update message containing t%e cause

value cell reselection$ t%e R7C stops esta)lis%ing A.R services to %andle cell update and

resumes A.R services onl, ater cell update is completed*

RS/->5T#Q>5T!? Reserved Parameter # >it !?2 N%en t%e s'itc% is turned on$ t%e R7C does

not reesta)lis% radio links or a E i t%e E reports to t%e R7C cell update caused ), SR>

reset* N%en t%e s'itc% is turned of$ t%e R7C reesta)lis%es radio links or a E i t%e E

reports to t%e R7C cell update caused ), SR> reset*

#s+e, 7O

Mandato", 7O

Featu"e #D NR1-"#"#"#

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Security Level

Featu"e $ame 3GPP Speci&cations

alue T,.e >it 1ield T,pe

/ alue 'an*e RS/->5T#Q>5T!"$ RS/->5T#Q>5T!#$ RS/->5T#Q>5T!?

Enume"aton

$umbe"t

RS/->5T#Q>5T!"#$ RS/->5T#Q>5T!#!"$ RS/->5T#Q>5T!?! Soter (andover

5nter R7C Sot (andover


/ alue 'an*e #3"""""

Enume"aton$umbe"t

7ot involved

&nt ms

Actual alue 'an*e #3"""""

Default alue


58/72

Security Level

!a"amete"

'elatonsh.

7one

Access Read 0 Nrite

e"3ce #nte""u.ted

Afte" Mod4caton

7o


#nte""u.ton

Du"aton5Mn)

7ot involved

Cauton 7one

aldaton of

Mod4caton

7ot involved

#m.act on 'ado

$et6o"k !e"fo"mance

7one


Att"bute Radio

M STATET5.ER

!a"amete" #D (oP%,c%RecgTmr

!a"amete" $ame (O P%,C% recon&guration timer

$E >SC?""

MM% Command ET &TATET#ME'

Meann* A timer to R7C 'ait or t%e response to p%,sical c%annel recon&guration in %ard %andover

procedure*

#s+e, 7O

Mandato", 7O

Featu"e #D NR1-"!"3"!

NR1-"!"3"=

NR1-"!"3"#

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Security Level

Featu"e $ame 5nter 1reJuenc, (ard (andover >ased on Coverage

5nter 1reJuenc, (ard (andover >ased on -I MoS

5ntra 1reJuenc, (ard (andover


/ alue 'an*e #3"""""

Enume"aton

$umbe"t

7ot involved

&nt ms

Actual alue 'an*e #3"""""

Default alue


60/72

Security Level

M STATET5.ER



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Security Level

!a"amete" #D R)RecgRspTmr

!a"amete" $ame Nait R> recon&guration response timer

$E >SC?""


Meann* A timer used to 'ait or t%e R> recon&guration response rom E in t%e R> procedure* Reer to

t%e 7ote*

#s+e, 7O

Mandato", 7O




/ alue 'an*e 3""3"""""

Enume"aton

$umbe"t

7ot involved

&nt ms

Actual alue 'an*e 3""3"""""

Default alue


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Security Level

or E recon&guration does not 'ork* 1or e+ample$ '%en t%e c%annel c%ange orm -C( to

1AC( or t%e c%annel c%ange rom 1AC( to -C($ t%e timer does not 'ork*2 T%e retransmit

timer is ! second* T%e R> recon&guration message ma, retransmit t%ree times '%en t%e

timer e+pires* T%e parameter modi&cation %as no impact on t%e eJuipment*

aldaton of

Mod4caton

7ot involved

#m.act on 'ado

$et6o"k !e"fo"mance

7one


Att"bute Radio

M STATET5.ER

!a"amete" #D R)RelRspTmr

!a"amete" $ame Nait R> release response timer

$E >SC?""


Meann* A timer to R7C 'ait or t%e R> release response rom E in t%e R> procedure* Reer to t%e

7ote*

#s+e, 7O

Mandato", 7O




/ alue 'an*e 3""3"""""

Enume"aton

$umbe"t

7ot involved

&nt ms

Actual alue 'an*e 3""3"""""

Default alue


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Security Level

'ecommended alue recon&guration message ma, retransmit t%ree times '%en t%e timer e+pires*


aldaton of

Mod4caton

7ot involved

#m.act on 'ado

$et6o"k !e"fo"mance

7one


Att"bute Radio

M STATET5.ER

!a"amete" #D (oCellpdateRspTmr

!a"amete" $ame (O cell update response timer

$E >SC?""


Meann* A timer to R7C 'ait or t%e response to t%e cell update con&rm rom E in or'ard %andover

procedure*

#s+e, 7O



64/72

Security Level

Mandato", 7O

Featu"e #D NR1-"#"@"#

NR1-"#"@"!

Featu"e $ame 5ntra R7C Cell pdate

5nter R7C Cell pdate


/ alue 'an*e ##""""

Enume"aton

$umbe"t

7ot involved

&nt ms

Actual alue 'an*e ##""""

Default alue


65/72

Security Level

*$" %all Re-establis'ent

T%e drop calls mostl, are caused ), Radio link ailureF$ RIC resetF and SR> resetF* tran can

initiate a Cell pdateF procedure to reesta)lis% t%e Radio Iink in a ne' cell to save some drops*

!a"amete" Chan*e 5MM%

command)

Desc".ton Cu""ent ettn*

on !!12

!"o.osed

ettn*

SET RRCTRISN5TC(6

RsvdPara#RS/->5T#Q>5T!!"Y

N%en t%e s'itc% is turned of$ t%e R7C

triggers cell update 'it% t%e cause value

RI 1ailure and reesta)lis%es radio links i

t%e R7C detects interrupted do'nlink

transmission on SR>!*

O7 O11

SET RRCTRISN5TC(6

RsvdPara#RS/->5T#Q>5T!3"Y

N%en t%e s'itc% is turned of$ t%e R7C

triggers cell update 'it% t%e cause value

RI 1ailure reported ), a E and

reesta)lis%es radio links$ i t%e associated

7ode> reports to t%e R7C t%at all radio

links or t%e E e+perience s,nc%ronization

loss*

O7 O11

SET RRCTRISN5TC(6

RsvdPara#RS/->5T#Q>5T!="Y

N%en t%e s'itc% is turned of$ or Es using

CS services$ t%e R7C triggers cell update

'it% t%e cause value RI 1ailure reported

), a E and reesta)lis%es radio links$ i t%e

R7C detects interrupted do'nlink

transmission on SR>!$ or i t%e associated

7ode> reports to t%e R7C t%at all radio

links or t%e E e+perience s,nc%ronization

loss*

O7 O11

SET RRCTRISN5TC(6

RsvdPara#RS/->5T#Q>5T!


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Security Level

SET

RRRS/-PARA6RS/-PARA##enc%mark6

Signi&cant improvement is seen on CS Call -rop rate and PS Call drop rate %as a slig%t improvement*



67/72

Security Level

Summary and Conclusion

Totall, # ZoLs 'ere implemented$ some individual )enc%mark evaluations in t%e previous slides

mig%t )e some com)ined operation afect* So to conclude some parameter tunings or eatures$ some

separate trials in ot%er R7CLs are reJuired*

Total 5mprovement

PS CSSR is improved rom D to *


68/72

Security Level

CS C-R is improved rom "*?


69/72

Security Level

5mprovement on (S-PA t%roug%put6

5mprovement on (SPA t%roug%put6

5mprovement on I PS3@= t%roug%put6



70/72

Security Level

1urt%er Actions6

$

o

Cate*o", #tem #m.lementa

ton

'ema"k 'ollout

cena"o

# PS CSSR

Optimizatio

n

>lind (andover

1undamental C%eck

!.a, Slig%t improvement on PS CSSR on

t%ese cells

Rollout in

entire net'ork

! -isa)le uplink CAC or

%ig% congesting cells

##Zun plink Po'er Congestions cleared$

and PS CSSR is around *


71/72

Security Level

coverage

PS

T%roug%putOptimizatio

n

1undamental C%eck6 =

sites 'ere not ena)led'it% -C(S-PA

;Zun 7o o)vious c%ange on stats as it is

related to t%e -C(S-PA capa)le%andset penetration and user

)e%avior*

Rollout in

entire net'ork

#" >ackground noise

ad8ustment

##Zun Slig%t improvement on (SPA

t%roug%put on stats*

Rollout in

entire net'ork

## CM5 1eed)ack Period

optimization rom !ms

to @ms

##Zun A)out 3d> improvement on average

RTNP$ '%ic% means 'e %ave almost

ased

on -,namic >IER

Target

Zul 5mplemented on Zul,$ no o)vious

improvement on statistics*

7eed a

separate trial

in anot%er R7C

#? (SPA Adaptive Re

transmission

=Zul, 0 S sites2

and TS sites2$ noimprovement is seen ater

implementation*

7eed a

separate trialin anot%er R7C

#; Smart

P%one

Optimizatio

n

.ultiRA> Optimization 3#.a, CS CSSR is improved rom @*!D to

*"D$ CS C-R is improved rom

"*;D to "*


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Security Level

congestions as 'ell*

# Call reesta)lis%ment ##Zul Signi&cant improvement on CS C-R$

slig%t improvement on PS C-R

Rollout in

entire net'ork

! Schedule

According to t%e pro8ect plan$ (ua'ei 'ill conduct !Brun cluster packet service optimization in !"#!*

.ean'%ile$ t%e )est practices and e+periences veri&ed in PP#! 'ill )e rollout in entire net'ork*

T9E E$D

3G Cluster Packet Service Optimization Report

Documents