UMTS Optimization Case Study

8/12/2019 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


7/35? Drop due to missing neig"-or

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

UMTS Optimization Case Study

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