Download - UMTS Optimization Case Study
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Radio Network Tuning andOptimization for Universal
Mobile TelecommunicationsSystem (UMTS
Dr. Hatem MOKHTAR
Senior Wireless Consultant
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MOTIVATION
3G net(ors are /e&omin$ &ommer&iall) availa/le all over
t!e (orl"
To &!e& t!e #un&tionalit) o# t!e net(ors /e#ore&ommer&ial laun&!
0et(or "esi$ns are /ase" on ,ro,a$ations mo"els an"
simulations &overa$e veri#i&ation
3G te&!nolo$) WCDMA is "i##erent #rom 2G
Tools an" met!o"s #or 3G 0et(ors
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Differences compared to 2G
In General
- T!e Te&!nolo$) is more &om,li&ate" Overla,,in$ &ells so#t
!an" over ,o(er &ontrol &ell /reat!in$ et&
- Hi$! ,er#orman&e re+uirements on ,ro"u&ts * 4 0et(orno"es
- In Particular for Tuning & Optimzation
- %ro&ess 4 tools are un"er "evelo,ment
- Co-lo&ate" GSM53G sites- S!are" Antenna S)stem
- 6nter-(orin$ (it! GSM
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Tuning or Optimization !"at is t"e difference
During Tuning
0o tra##i& in t!e net(or 0o su/s&ri/ers
0et(or tune" onl) /ase" on "rive test "ata
8a/our intensive (it! re,eate" "rive testAll is a/out %re-laun&! a&tivities
During Optimization
Commer&ial tra##i& su/s&ri/ers usin$ t!e net(or
Statisti&s use" (i"el) to monitor net(or ,er#orman&e
Drive testin$ 9ust in &ase
All is a/out %ost:laun&! a&tivities
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Tuning Process #lo$
Radio Network Initial Tuning for WCDMA
Preparations Parameter
Audit
Commer&ial8aun&!
Dri%e Testing &Post
Processing
"angeVerification& 'eporting
Anal(sis &"ange
Proposals
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Pro-lem? Detected Nig"-or 1DN
* sen"s a Measurement Re,ort t!at &ontains an event1a
means a""in$ a ne( R8 &ell to A&tive Set 6# t!e re,orte" &ell is not in t!e &urrent nei$!/or &ell list an"
t!e re,orte" *&50o is /etter t!an t!e /est servin$ &ell
*&50o in AS /) some "Fs set /) a R0C ,arameter
6# #or an) reason t!e ne( &ell &an not /e a""e" to AS &all(ill /e release"
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2@
ase >? Drop due to missing neig"-or
ID0J &ell /etter t!an t!e servin$ &ell
D8 F8*R$ets (orse
ID0J &ell /etter t!an t!e servin$ &ell
D8 F8*R$ets (orse
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3B
ase 2? Drop due to Poor o%erage 1lo$ '0P
Pro-lem? Poor D+ co%erage
W!en * $ets to an area (it! lo( RSC% -1B7 "Fm
re$ar"less *&50o values t!ere is !i$! ris #or "ro,.
* (ill liel) ram, u, t!e transmitte" ,o(er an" rea&! its
ma? ,o(er. T!e D8 F8*R (ill ,ro/a/l) in&rease an" S6R
tar$et &annot maintain an)more #inall) t!e &all "ro,s.
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ase @?
P0? 0ession Error due to Poor D+ o%erage* enters a ver) lo( &overa$e area RSC% : 1B7 "Fm.
T!e ,a&et &onne&tion is &arrie" on a ;5; DCH C!annel
as &onse+uen&e o# t!e lo( &overa$e &on"itions.
T!e * (ill liel) ram, u, its ,o(er to t!e ma?imum $oes
to 6"le Mo"e an" t!e A,,li&ation an" R8C t!rou$!,uts $o
to ero.
At t!is ,oint t!e RAS a,,li&ation (ill start t!e SessionTimeout timer i# t!e t!rou$!,ut is not resume" t!e Session
*rror event is tri$$ere" (it! &ause Isession timeoutJ.
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#INA+ !O'D0
#or net$or* tuning $e need to rela( on field measurements $"ic"reuire eBtensi%e dri%e tests
#inding t"e -est possi-le configuration for antenna "eig"ts tiltsazimut"s and parameter setting for all t"e present cells)sectors in t"enet$or* and also for an( ne$ sites t"at mig"t -e needed to impro%eco%erage
Po$er adCustment can also -e used for net$or* tuning -ut can -ecomecomplicated and result in poor net$or* performance
,se of 'emote Electrical Tilt 1'ET Antenna is preferred o%er mec"anicaltilt antenna
Neig"-our definition is of prime importance in ,MT0 net$or* 10oft"ando%er gain and interference reduction
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omparison of Mec"anical and Electrical Do$n6tilts