232586122-2G-optimization.ppt

7/24/2019 232586122-2G-optimization.ppt

1/38

2002 Network Optimization

Network OptimizationNetwork Optimization


2/38


Outlines

Optimization Concepts Analysis and Measurements Optimizing Parameters Typical pro lems and solutions


3/38


Optimization ConceptsOptimization Concepts


4/38


Optimization Concepts! "ole! Process! #ey $ndicators

! "eports and Action plans! Acti%ities! $nput &ata


5/38


Role

Optimization engineer missionThe optimization engineer ensures that the dropped calls and the otherThe optimization engineer ensures that the dropped calls and the other

quality factors are at their best, leading to maximum customerquality factors are at their best, leading to maximum customersatisfaction and revenue potential satisfaction and revenue potential

No matter 'ow t'oroug' t'e design work is( it is t'e optimization engineer w'o'as to make t'e e)uipment really work( *rom an engineering point o* %iew


6/38


Process

+ystem optimization , per*ormance in%ol%es applying a set o* tec'ni)ues -! $denti*ying o .ecti%es! $solate system components! Test plan! Taking actions! Conduct postanalysis


7/38 2002 Network Optimization

Process

$denti*ying o .ecti%e! $denti*ying your o .ecti%e wit' t'e e**ort you are a out to partake in and document

it

$solate system component! To identi*y w'at aspect o* t'e system you are trying to work on( N++( /++( radio

site( mo ile( antennas or t'e " en%ironment


8/38 2002 Network Optimization

Process

Test plan! To esta lis' a plan and to write down w'at you want to accomplis'( 'ow you will

accomplis' it( and w'at t'e e1pected results will e

Take action! To conduct t'e work or t'e trou les'ooting t'at is identi*ied in your o .ecti%e(

usually a test plan


9/38


Process

Conduct postanalysis! To conduct a postanalysis o* your work and t'en issue a closing document eit'er

supporting or re*uting your initial conclusion and identi*ying t'e w'at are t'e ne1tactiona le items


10/38


Key Indicators

T'e most *amiliar key indicators *or any operators are -! &rop call rate! Call setup success rate! Call setup locking rate! TC 3+&CC Access *ailure! O Causes! O ailures


11/38


Key Indicators

4it' t'e proper use o* o* key indicators( t'e optimization engineer must e proactive proactive wit' respect to system per*ormance issues

w'en ser%ice5a**ecting pro lem occurs( it is etter *or t'e optimizationengineer to already eawareaware o* t'e pro lem and 'a%e a solutionsolution

4'en operating wit' multiple %endor system( it is important to cross map t'eindicators reported *rom one %endor and *ind a corollary to it wit' anot'er%endor


12/38


+etting t'res'olds *or #ey $ndicators! T'e t'res'old and t'e o .ecti%e o* t'e di**erent key indicators must e set in a

realistic way! T'e o .ecti%es s'ould e dri%en to impro%e t'e o%erall per*ormance o* t'e

networking *actoring into it -

T'e growt' rate e1pected /udget constraints

! $t is important to set aggressi%e goals to work *or( ut it e)ually important to in%ol%emem ers o* t'e sta** w'ose .o is to ensure t'at t'e mission statement is met

Key Indicators


13/38


Reports and Action Plans

"eports! $t is %ery important to produce a regular summary reports *or %arious le%els o*

management so t'at t'ey know 'ow t'e system is operating! 6ou s'ould determine in ad%ance w'en deli%ering a report( w'oneedsneeds to see t'e

in*ormation against w'owantswants to see it


14/38


Reports and Action Plans

Action Plans! Action plan is t'e rig't conse)uence to t'e reports! 7sta lis'ing a )uarterly and mont'ly action plan *or impro%ing t'e network is

essential in ensuring its 'ealt'! 7ac' )uarter 8long term plan9 you s'ould identi*y t'e worst :0; o* your system

*ollowing t'e #P$s! T'e )uarterly action plan s'ould e used as t'e deri%ing *orce *or esta lis'ing t'e

mont'ly plans! T'e s'ort5term action plans coupled wit' t'e long term action plans will 'elp deri%e

t'e success or *ailure o* t'e o%erall mission


15/38


T'e radio optimization is uilt around t'ree main tasks-

! &etection o* t'e pro lems! Analysis o* t'e pro lems! +ol%ing t'e pro lems

Activities


16/38


F r e q u e n c y P l a n

F o l l o w i n g V I P a n d Q o S

C o m p l a i n s

F o l l o w i n g t h ei n s t a l l a t i o n

o f a n e w s i t e o r a ne x t e n s i o n

S t a t is t i c s a l a r md e f i n i t i o n

a n d M o n i t o r i n g

O p t i m i a t io n! e a m

" e d e s i g n# $ n t e n n a t i l t s %

" e a im u t h &

P a r a m e t e r s a n d f r e q u e n c y t u n i n g

! r a f f i c ' a n d l i n g

F i e l d M e a s u r e m e n t s

Activities


17/38


Activities

re)uency plan! Pro%ide a *re)uency plan *or t'e macrocells and microcells! Plan t'e *re)uencies *or a new site or replace *re)uency in case inter*erence is

detected

+ite "edesign! Minimizing t'e ad e**ect o* o%erlapping and o%ers'ooting w'ic' 'as %ery ad

in*luences on t'e per*ormance o* t'e network! 7n'ancing t'e co%erage o* poor co%ered areas


18/38


Activities

7ac' optimizer 'as to deli%er a weekly e%olution report s'owing t'e e%olutiono* 'is zone according to t'e *ollowing indicators-

! Call &rop "ate! / call setup TC /locking "ate! / Call setup success "ate

! / TC Tra**ic Carried!


19/38


Ot'ers! New +ite $ntegration! Parameters tuning! Neig' or cleanings! Tra**ic 'andling *ollow up! andling >$P and =o+ complaints

Activities


20/38


Input Data

&ata gat'ering is an important issue t'at *acilitate t'e work o* t'e optimizer &ata could e -

! "aw data 8co%erage maps( *re)uency plan( sites data ase ??etc9! Measurements data 8&ri%e test( A5 is3A captures( Call traces( statistics @etc 9

andling t'ese data in optimum way will lead to etter per*ormance andoutput


21/38


Input Data

Plots3Maps! Co%erage 8glo al region and speci*ic area9! /est ser%er map! re)uency planning 8+ite location 8 (69( /CC ( c'annels9

+ites &ata ase! "adio Parameters! Neig' ors list! C'annel Con*iguration


22/38


Input Data

+tatistics and $ndicators! $denti*y occasional *aults on a su system 8/++( /T+9 and esta lis' correcti%e

action! &etect and identi*y radio pro lem on a cell! +tatistics can e used to trace and %eri*y ig c'anges in t'e network 8 P(

Parameters c'anges( implementations o* pro lem solutions9! Predict network e'a%ior according to tra**ic e%olution! CanBt re%eal t'e cause o* a pro lem( additional analysis %ia call trace and3or dri%e

test or traces s'all e used


23/38


Input Data

&ri%e Tests! Presents t'e real network per*ormance e1perienced y su scri ers! Pro%ide *ield in*ormation w'ic' is o*ten %ery use*ul to sol%e speci*ic trou les! "outes o* &ri%es tested must e agreed to 'a%e a %alua le output

All sites and sectors s'ould e tested wit'in t'e route at least once

All ma.or roads , 'ig'ways s'ould e tested All cells s'ould e tested *or 'andout and 'andin wit'in t'e routes i* possi le T'e routes s'ould e appro1imately 25 'ours in duration


24/38


A is measurements! &ri%e tests gi%e a snaps'ot %iew o* t'e network! &ri%e tests pro%ide detailed in*ormation on t'e downlink only! Not recommended to ad.ust cell and O parameters ased on a speci*ic dri%e test! A is is t'e ideal source *or le%el( )uality and inter*erence analysis! A is pro%ides sync'ronized in*ormation on uplink and downlink

Input Data


25/38


Input Data

A5$nter*ace measurements! T'is inter*ace is standardized y 7T+$ and its implementation is mandatory! Network optimization ased on A5inter*ace analysis makes t'e process o .ecti%e

and independent o* %endor in*rastructure! Collecting data is usually easier 8 ecause o* t'e reduced num er o* link

connections9 t'an *or A is or &ri%e Test data! Analyses can e run at /+C le%el( t'en at cell5 and e%en at indi%idual call le%el(

wit' t'e same uni)ue dataset


26/38


Troubles ootin!Troubles ootin!


27/38


Trou les'ooting! Co%erage! $nter*erence!


28/38


Covera!e

+ymptoms! ig' drop call rate! ig' rate o* )uality and le%el 'ando%ers! Dow proportion o* etter cell 'ando%er


29/38


Covera!e

$* actual co%erage is not t'e one predicted y radio network planing tools t'en-! C'eck antenna system! increase antenna down tilt! C'eck t'e parameter sEt1pwrEma1 8ma1Et1E ts9

$* actual co%erage is t'e one predicted t'en-! $ndoor tra**ic! i* lack spot close to cell order( ease outgoing O?


30/38


Inter"erence

T'e inter*erence is t'e presence o* ad )uality and good r1le% in t'e sametime on t'e same area

Two types o* inter*erence-! F+M inter*erence

Co5c'annel

Ad.acent C'annel! 71ternal inter*erence

Ot'er Mo ile network Ot'er " sources


31/38


Level

FrequencyF(BTS1)=F(BTS2)+1

9dBneighbor

serving

Inter"erence

F+M inter*erence! Ad.acent c'annel inter*erence-! $nter*erence occurs i* t'e neig' or le%el is 'ig'er t'an t'e ser%ing y GH Id/! 8 C3$ J5Id/9


32/38


FrequencyF(BTS1)=F(BTS2)

-9dB

Level

serving

neighbor

Inter"erence

Co5c'annel inter*erence-! $nter*erence occurs i* t'e neig' or le%el is lower t'an t'e ser%ing y JH Id/! C3$JId/


33/38


Inter"erence

+ymptom o* F+M inter*erence-! ig' rate o* )uality O 8specially downlink )uality9! ig' rate o* call drop! ig' rate o* call *ailure

+olution-! C'ange o* *re)uency! &own5tilt o* inter*erer( or e%en c'ange o* antenna orientation! "eduction o* /+ power! Concentric cell implementation


34/38


Inter"erence

Non F+M inter*erence Ot'er " inter*erer - "adar(medical de%ice( army communication de%ices ??? +ymptom o* e1ternal inter*erence-

! ig' rate o* )uality O 8specially uplink )uality9! ig' rate o* call drop! ig' rate o* call *ailure! ig' rate o* $nter*erence on idle

+olution-! C'ange o* inter*ered *re)uency


35/38


#nbalanced Power $ud!et

Pat' alance H pat' loss8ul9 5 pat' loss8dl9! Pat' alance s'ould e e)ual to zero? Positi%e %alue o* pat' alance means t'at

t'e pat' loss in t'e


36/38


Is there any site out of servicenear by?

Is it a border cell?

TCH_RF_LOSS> threshold

Yes

Yes

No

Yes

Contact SS

Chec! if thereis a need for a

ne" site

!ndover"F!ilures#$hreshold

Yes

Yes

No

No

%o $o T& "'F"L SS roble*

%o $o o"F!ilure roble*

Drop_Call_Rate>Threshold

%i! Drop Call Rate


37/38


TC% Con!estion


38/38

&DCC% Con!estion

232586122-2G-optimization.ppt

Documents

Transcript of 232586122-2G-optimization.ppt