servicequalitybasedwcdmaaccess_dubai.ppt
Post on 19-Feb-2018
217 Views
Preview:
TRANSCRIPT
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 1/16
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
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 2/16
'
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 $% cases has been resulted ith direct camping on 3G saving 2 !ocation
"pdates hich appears on normal call scenario.
+tatistically also slight reduction on !",s on 2G has been observed . *eature is supported by &el - mobiles.
/aging is also checked for the cases here direct camping on 3G is performed.
GSM to WCDMA Adanced Cell reselection makes it possible to use &+/ criteria in addition to e)isting cNo
criteria hile evaluating 3G radio conditions in case of a 2G3G cell reselection. 'dditional &+/ criteria ouldprovide more robustness for better estimation of "! radio conditions and prevents pingpong,s.
2 scenarios on field test have been tried Drive scenario used fi)ed &+/ threshold on 2G and 2G3G cell
reselection is observed hile driving toard to site providing better 3G &* conditions for cell reselection. +tationary
scenario aimed to observe 2G3G cell reselection hile dynamically reducing &+/ threshold on 2G . Both cases
had been tried successfully.
GSM to WCDMA Adance Cell reselection functionality has also been confirmed statistically by observing trend
of 3G cell reselection numbers. #here as 20 4 reduction on cell reselection number hen &+/ threshold valueof 50 dBm as applied.
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 3/16
)
&EATURE DESCRI'TI%(
+ervice 6uality Based 7D8' 'ccess is set of 3 functionalities to enhance the best in class N+N B++9&'N
interorking performance.
7D8' Neighbour ell &eporting nhancement have not been tried since 2G to 3G %+(: is not alloed in d"netork
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 4/16
&
M%)I*E S'ECI&IC C$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
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 5/16*
M%)I*E S'ECI&IC C$A((E* RE*EASE MESSAGE +&IE*D TEST,
Direct camp on 3G after
IRAT HO
Camp on 2G with LU after
IRAT HO
Paging on 3G is
OK
LU on 2G
2G dedicated
mode
3G idle mode directly
after 2G release
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 6/16
M%)I*E S'ECI&IC C$A((E* RE*EASE MESSAGE +&IE*D TEST,
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
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 7/16
M%)I*E S'ECI&IC C$A((E* RE*EASE MESSAGE +&IE*D TEST,
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.
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 8/16
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
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 9/16 +
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 .
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 10/16%(
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 <
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 11/16%%
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
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 12/16%'
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.
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 13/16
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%
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 14/16
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%
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 15/16
+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
7/23/2019 ServiceQualityBasedWCDMAAccess_Dubai.ppt
http://slidepdf.com/reader/full/servicequalitybasedwcdmaaccessdubaippt 16/16
I8ⅅRSC'4in <0=> d)4 II8ⅅRSC'4in <0?" d)4
III8ⅅRSC'4in <0?> d)4 IV8 ⅅRSC'4in <0?=d)4
1G
/G
&IE*D TEST : STATI%(ARY SCE(ARI% *AYER / MESSAGES
top related