GSM KPI Flow chart Process

KPIs

SDCCH Blocking

SDCCH Drop

TCH Drop Rate

Handover Success Rate

SDCCH Congestion OptimizationSDCCH Congestion

C heck s ite position

Location area

border?C hange Location

A rea Border

C heck and increaseC R H

C heck TC H tra ffic

TC HC ongestion?

C heck S M S activity

M any SM Sm essages?

E

C heck period icregistra tion

Too frequentregistra tion?

C heck H W ava ilab ilty

Lowava ilab ility?

See TC H & SD C C H

Availab ility

Add TC Hcapacity

R edim ension SD C C H

C hange registra tionin terva l tim ers

NO

YES

NO

NO

NO

YES

YES

YES

NO

YES

YES

SDCCH Congestion OptimizationC heck channel configura tion

C om binedSD C C H ?

C heck tra ffic trend

Short te rmtra ffic growth?

C heck S D C C H d im ension ing

E

U nderd im ensionedSD C C H ?

C heck S D C C H m ean ho ld ing tim e

Long m ean ho ld ingtim e?

Is ce ll b roadcastused?

Avoid ce ll b roadcast ifpossib le

M ake channelnon-com bined

N o activity

C heck H W and num berof Fa lse Accesses

R edim ensionSD C C H

END

NO

NO

YES

YES

YES

YES

YES

NO

NO

NO

C heck A daptive configuration o flogica l channel and param eters

AC STATE off? Sw itch onYES

SDCCH Drop OptimizationC h e c k S D C C H D r o p p e d P e r C e ll

C h eck d ro preaso n

B adq u a lity ?

C h eck IC M C h eck freq u en cy P lan

F req u en cy scanR u n M R R & F A S

L o wS S ?

R efe r to L o w S San a ly s is f lo w ch a rt.

H ig hT A ?

C h eck s ite lo ca tio n& T A L IM

T C HC o n g es tio n ?

C h eck S _ D R -S _ N T C In c rease T C H o r u s in g

C h eck B T S e rro rlo g

H Wfau lt?

S w ap &R ep a ir H W

B

N O

Y E S

Y E S

Y E S

Y E S

Y E S

N O

N O

N O

N O

R ad io F ea tu res , C L S , H C S

SDCCH Drop OptimizationB

T ra n sm iss io n fa u lt?

P e rfo rm lin kin v e s tig a tio n

C h e c k L in k Q u a lity

C h e c k M S fle e t

P e r fo rm D r iv e T e s t

P e r fo rm M T R /C T R /M R R

P e rfo rm s ite su rv e y

C h e c k a n te n n a in s ta lla tio n

E N D

Y E S

N O

TCH Drop – OptimizationDropped Calls on TCH

C heck rad io ne twork features

P ower regu la tionused properly?

D T Xused?

C heck outpu t power

C heck loca ting param eters

B ad param eterse tting?

P owerba lance?

A djust ou tpu t power

In troduceD T X

C orrect param eterse tting

Frequencyhopp ing

used?

A ctiva te frequencyhopp ing

NO

C orrect power regu la tionparam eters

YES

NO

YES

YES

NO

NO

YES

NO

M issingne ighbours? YES R un N C S

YES

C heck dropped ca llreason

B adqua lity?

Low signa lstrength

P erfo rm in te rfe renceana lysis

P erfo rm low signa lstrength ana lysisA

NO

NO

YES

YESNO

TCH Drop – Optimization

M ost d ropped C a ll during

H O ?

C heck losthandovers

P erform handoverana lysis

S w ap & repa irH W

C heck s iteposition

D ragoonsite?

C heck M S flee t

B est serverexists?

C heck antennainsta lla tion

P erform site survey

C heck B TS E rror Log

H Wfau lt?

Transm issionfau lt?

C heck link qua lity andS ynchron iza tion

R em ove site or change

frequency

P erform linkinvestiga tion

A dd site

P erform M TR /C TRrecord ings

P erform drive tests

H igh tim ingadvance

END

A

C heck s ite loca tion

& TA LIMYES

NO

YES

NO

NO

YES

NO

YES

YES

NO

NO

YES

C heck D ropped C a lls per TS basis

TCH Drop – OptimizationLow signal strength

analysis

Identify base line requirem ents

C heck s ite position

C heck if up link or downlink problem

C heck coverage p lots

C heck if om ni s ite

C heck antenna configuration

C heck output power

C alcu late power balance & linkbudget

Perform drive tests

M ake s ite vis it

Perform M T R /C T R record ings

C heck if indoor problem

Correctproblem

Handover – OptimizationUnsuccessful Handovers

C heck congestionperform ance

TC Hcongestion?

C heck S A E setting

NO

S Wcongestion?

C heck Locating param eters

C heck N e ighbouring ce ll de fin itions

W rong ce llsdefined?

M issingne ighbours?

Too m anyne ighbours?

Too m anym easurem ent

channe ls?

S trange or corruptparam eter se tting?

NO

NO

NO

NO

NO

A dd TC Hcapacity

YES

Increase S A EYES

R em ove incorrectdefin itions

YES

A dd m issingre la tion

YES

R em ove unnecessaryre la tions

YES

R eview and correct thedefined M B C C H N O

YES

C

NO

C orrect param etersYES

Handover – Optimization

C heck use o f rad iofeatures

C

NO

Are a ll rad iofeatures used?

YES

C heck coverage

NO

Low SS on ce llborder?

Perform drive test

YES Im prove coverage

C heck in terference

YES

Badquality?

R educe in terference forpotentia l cand idate

YES

D elayed handover

decis ion?

C heck handoverparam eters

YES

In troduce unusedfeatures

∙ T im er Exp iry A fterM S is Lost

NO

D

NO

Handover – OptimizationD

C heck B TS E rror Log

H Wfau lt?

C heck link qua lity

Transm issionfau lt?

S w ap & repa ir H WYES

NO

Im provetransm ission

YES

P erform site v is it

NO

C heck antennainsta lla tion

A ntenna connected tow rong feeder?

Incorrectdow ntilt?

H idedantenna?

B ad antennainsta lla tion?

NO

NO

NO

C hange feederYES

C orrect tiltingYES

C hange antennaposition

YES

C orrect insta lla tionYES

END

NO

Is the ce ll a t in ter-M S Cborder?

YES

C heck in ter-M S C H O

perform ance

NO