ServiceQualityBasedWCDMAAccess_Dubai.ppt

7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt

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Radio Network Optimization , Dubai

SERVICE QUALIT !ASED "CD#A ACCESS

DU!AI I#$LE#ENTATION %& DEC '(%%

This document is confidential and is intended solely for the use and information of the

client to whom it is addressed.

Nokia Siemens

Networks



'

EXECUTIVE SUMMARY

Mobile specific channel release and GSM to WCDMA Adanced Cell reselection have been tested

successfully under the cells of DBN10.

Mobile specific channel release makes it possible to direct camping on 3G immediately after 2G call releaseithout need of !ocation "pdates . #his is achieved by activating the feature and 3G cell reporting on 2G dedicated

mode $ folloing an %&'# (andover for e)ample.

*ield test shoed !" # of IRAT $% cases has been resulted ith direct camping on 3G saving 2 !ocation

"pdates hich appears on normal call scenario.

+tatistically also slight reduction on !",s on 2G has been observed . *eature is supported by &el - mobiles.

/aging is also checked for the cases here direct camping on 3G is performed.

GSM to WCDMA Adanced Cell reselection makes it possible to use &+/ criteria in addition to e)isting cNo

criteria hile evaluating 3G radio conditions in case of a 2G3G cell reselection. 'dditional &+/ criteria ouldprovide more robustness for better estimation of "! radio conditions and prevents pingpong,s.

2 scenarios on field test have been tried Drive scenario used fi)ed &+/ threshold on 2G and 2G3G cell

reselection is observed hile driving toard to site providing better 3G &* conditions for cell reselection. +tationary

scenario aimed to observe 2G3G cell reselection hile dynamically reducing &+/ threshold on 2G . Both cases

had been tried successfully.

GSM to WCDMA Adance Cell reselection functionality has also been confirmed statistically by observing trend

of 3G cell reselection numbers. #here as 20 4 reduction on cell reselection number hen &+/ threshold valueof 50 dBm as applied.



)

&EATURE DESCRI'TI%(

+ervice 6uality Based 7D8' 'ccess is set of 3 functionalities to enhance the best in class N+N B++9&'N

interorking performance.

7D8' Neighbour ell &eporting nhancement have not been tried since 2G to 3G %+(: is not alloed in d"netork



&

M%)I*E S'ECI&IC C$A((E* RE*EASE MESSAGE

8obile +pecific hannel &elease 8essage feature ill remove unnecessary signalling and reduce the delay in

service. 8obile +tations could be commanded directly to camp on 3G after a call release in 2G ;after a %&'# (:

e.g <

*eature is supported by &el - and later mobiles

Direct camping to 3G can avoid !'"9&'" signalling process hich typically takes 2= seconds

Direct camping information is indicated by B+ to all dual mode terminals hen they report at least one 3Gneighbour cell

#he reported 3G cell is used as a target cell in hannel release message

%f several 3G neighbor cells are reported by ms$ best one is used as target for idle mode camping


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M%)I*E S'ECI&IC C$A((E* RE*EASE MESSAGE +&IE*D TEST,

Direct camp on 3G after

IRAT HO

Camp on 2G with LU after

IRAT HO

Paging on 3G is

OK

LU on 2G

2G dedicated

mode

3G idle mode directly

after 2G release




ell reselection on 2G

immediately after call

release on 2G $ than 3G

cell reselection and 3G

!" take place . No

proper 3G candidate has

been measured on 3Gdedicated mode.

all directly camps on 3G

after 2G call release ithout

!".

ell reselection

folloed by !" on

3G

%-t of . /G01G IRAThandoers on field test 2 !" #

of cases started directl3

ca4pin5 on 1G 67o *U on 1G

and /G 8




2G dedicated

3G idle mode directly

after 2G release

%n order to have direct access on 3G after 2G call release $ best 3G neighbours need to be reported by ms

during 2G dedicated mode.

#herefore 6&+ parameter ; (andover ontrol < has been set to > ; alays < in order to make sure 3G

neighbours are being reported for direct access to 3G.



M%)I*E S'ECI&IC C$A((E* RE*EASE MESSAGE +*AYER / ,

&EATURE IS %( 2 (% DIRECT CAM'I(G %( /G

+DUE T% (%T $AVI(G /G CA(DIDATES RE'%RTED

8 REGU*AR C$A((E* RE*EASE MESSAGE

&EATURE IS %( 2 DIRECT CAM'I(G %( /G 2 CE**

SE*ECTI%( I(DICAT%R $AS )EE( ADDED T% T$EC%(TE(T %& C$A((E* RE*EASE MESSAGE AS

S$%W( )E*%W


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M%)I*E S'ECI&IC C$A((E* RE*EASE MESSAGE +1G 9'Is,

#here is a slight reduction on !ocation "pdates $ around 2 4 . :n 2G $ there is no ay to discriminatelocation updates in terms of 3G ? 2G cell reselection. @noing the fact that feature orks only ith &el -

mobiles $ it is important to have penetration of such mobiles to get correct estimation on relieve on !",s

*rom the field trials $ out of - %&'# (:,s $ =0 4 of cases had direct camping on 3G right after channel release

on 2G .


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M%)I*E S'ECI&IC C$A((E* RE*EASE MESSAGE +/G 9'Is,

%mprovement is not visible from 3G @/%,s. !arger scale and isolated activation is reAuired. 't1100 am $ both /%( &+/ threshold has been changed and 6&+ has been changed

; hich ill allo 8obile +pecific channel release feature to function properly by enabling

reporting of 3G cells on 2G dedicated mode <


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GSM to WCDMA ADVA(CED CE** RESE*ECTI%(

&eceived signal code poer ;&+/< can be used as an additional 2G to 3G cell intersystem handover or %+

N& criterion in dedicated mode to improve 2G to 3G handover9cell reselection success rate

/%( is a common donlink pilot channel in 3G an be used ith 3G// &el.= and later terminals ;&+/ criterion is an optional feature for &el.55 and &el.

terminals<

&+/ gives a better estimate of the 3G uplink performance than the earlier used reselection criterion /%( c9Noalone

7ithout the use of &+/ criterion$ the terminal could directed to a 3G cell ith too eak signal and fluctuating

c9No hich could cause a return back to 2G netorkNote c9No gives a good estimate of 3G donlink Auality

&+/ value measured by the terminal needs to e)ceed a certain threshold level managed by B+$ before themeasured 3G cell is added in the measurement report sent back to B+

2G

3G – good Ec/No, low RSCP/%( &+/criterion illimprove the %+(:or %+N&success rate

Ec/No as only criterion

2G

3G – good Ec/No, low RSCP

RSCP as additional criterion


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GSM to WCDMA ADVA(CED CE** RESE*ECTI%( +STATISTICS,

At this point FDD_RSCPmin

has been changed to -90 dBm

and as seen obviously therehad been 20 % reduction on

the number of 2G to 3G cell

reselections.



2G

3G

%ntersystem cell reselection

takes place at this point hen

3G &+/ value e)ceeds

*DDC&+/ offset value hich

is set at dBm. #ime chart is

shon belo.

During drivetest $ idle mode test started at edge of 3G

coverage here &+/ is less than 5=dBm $ *DDC&+/

threshold is set to dBm $ then forced selection to 2G and

release locking immediately and drive to nearby site

DEB2>>3 till &+/ is greater than *DDC&+/ values

/oor 3G coverage

ell reselection forced to 2G and

released hile setting *DDC&+/ at

dBm.

3G is reselected at 1 dBm

&IE*D TEST : DRIVE SCE(ARI%



1G

/G

'ctivation of /%( &+/ feature adds 2 parameters to +ystem %nformation #ype 2Auater message *DDC6minC:ffset and*DDC&+/min. 's seen from above snapshot of drive test layer 3 messages$ *DDC&+/min value is noticed as dBm before

3G cellreselection.

&IE*D TEST : DRIVE SCE(ARI% *AYER / MESSAGES

&IE*D TEST STATI%(ARY SCE(ARI%



+tationary test has been performed on the same location here 3G /%( &+/ value is Auite poor . #his time $methodology as to change *DDC&+/min value starting from dBm till 5 dBm at steps in order to catch 2G to

3G intersystem cellreselection.

*DDC&+/value 1 *DDC&+/value 2 *DDC&+/value 3 *DDC&+/

value

&IE*D TEST : STATI%(ARY SCE(ARI%

&IE*D TEST STATI%(ARY SCE(ARI% *AYER / MESSAGES



I8&DD;RSC'4in <0=> d)4 II8&DD;RSC'4in <0?" d)4

III8&DD;RSC'4in <0?> d)4 IV8 &DD;RSC'4in <0?=d)4

1G

/G

&IE*D TEST : STATI%(ARY SCE(ARI% *AYER / MESSAGES

ServiceQualityBasedWCDMAAccess_Dubai.ppt

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