GSM KPI Flow chart Process

KPIs

SDCCH Blocking

SDCCH Drop

TCH Drop Rate

Handover Success Rate

SDCCH Congestion OptimizationSDCCH Congestion

C heck site position

Location areaborder?

C hange LocationArea Border

C heck and increaseC R H

C heck T C H tra ffic

TC HC ongestion?

C heck S M S activity

M any S M Sm essages?

E

C heck period icregistra tion

Too frequentregistra tion?

C heck H W ava ilab ilty

Lowavailab ility?

See TC H & S D C C H

Availab ility

Add T C 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 con figuration

C om binedSD C CH ?

Check traffic trend

Short termtraffic grow th?

C heck SD C CH d im ension ing

E

Underd im ensionedSD C C H?

Check SD CC H m ean ho ld ing tim e

Long m ean ho ldingtim e?

Is ce ll b roadcastused?

Avoid ce ll b roadcast ifpossib le

M ake channelnon-com bined

N o activity

Check HW and num bero f Fa lse Accesses

R edim ensionSD C C H

END

NO

NO

YES

YES

YES

YES

YES

NO

NO

NO

C heck Adaptive configu ration o flogica l channel and param ete rs

AC S TAT E o ff? Sw itch onYES

SDCCH Drop OptimizationC h e ck S D C C H D r o p p ed P e r C e ll

C h ec k d ro preaso n

B adq u a lity ?

C h eck IC M C h eck freq u en cy P la n

F req u en c y sc anR 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 c h a rt.

H ig hT A ? C h ec k s ite lo c a tio n

& T A L IM

T C HC o n g e s tio n ?

C h ec k S _ D R -S _ N T C In c re ase T C H o r u s in g

C h ec k 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 a d 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 k

in v e s tig a tio n

C h e c k L in k Q u a li ty

C h e c k M S f le e t

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

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

P e r fo 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 network featu res

Power regu lationused properly?

D TXused?

C heck ou tpu t power

C heck loca ting param eters

Bad param eterse tting?

P ow erba lance?

Ad just ou tpu t power

In troduceD T X

C orrect param eterse tting

Frequencyhopp ing

used?

A ctivate frequencyhopp ing

NO

C orrect power regu lationparam eters

YES

NO

YES

YES

NO

NO

YES

NO

M issingne ighbours? YES R un N C S

YES

C heck dropped ca llreason

Badquality?

Low signa ls trength

Perfo rm in terferenceana lysis

Perform low signalstrength analysisA

NO

NO

YES

YESNO

TCH Drop – Optimization

M ost d ropped C all du ring

H O ?

C heck losthandovers

P erform handoverana lysis

S wap & repa irH W

C heck siteposition

Dragoonsite?

C heck M S flee t

B est se rverex is ts?

Check antennainsta lla tion

P erform s ite su rvey

C heck B TS E rro r Log

H Wfault?

Transm iss ionfau lt?

C heck link quality andS ynchroniza tion

R em ove site o r cha ngefrequency

P erform linkinvestiga tion

Add site

P erfo rm M TR /C TRrecord ings

P erfo rm drive tests

H igh tim ingadvance

END

A

C heck s ite loca tion & TA LIM

YES

NO

YES

NO

NO

YES

NO

YES

YES

NO

NO

YES

C heck Dropped C alls per TS basis

TCH Drop – OptimizationLow signal strength

analysis

Identify base line requ irem ents

C heck s ite position

C heck if uplink or downlink problem

C heck coverage plots

Check if om ni s ite

Check antenna configura tion

Check output power

C alcu late power balance & linkbudget

Perform drive tests

M ake s ite vis it

Perform M TR /CT R recordings

Check if indoor problem

Correctproblem

Handover – OptimizationUnsuccessful Handovers

Check congestionperfo rm ance

TC Hcongestion?

Check S A E se tting

NO

S Wcongestion?

C heck Locating param eters

C heck Ne ighbouring ce ll de fin itions

W rong ce llsde fined?

M iss ingne ighbours?

Too m anyne ighbours?

Too m anym easurem ent

channe ls?

Strange or corruptparam eter setting?

NO

NO

NO

NO

NO

Add TCHcapac ity

YE S

Increase SA EYE S

Rem ove incorrectde fin itionsYE S

A dd m iss ingre la tion

YE S

Rem ove unnecessaryre la tions

YE S

R eview and correct thedefined M B C CH N O

YES

C

NO

C orrect param etersYES

Handover – Optimization

Check use o f rad iofea tu res

C

NO

A re a ll rad iofea tures used? YES

Check coverage

NO

Low S S on ce llborder?

P erfo rm drive test

YES Im prove coverage

C heck in te rfe rence

YES

Badqua lity?

Reduce in te rfe rence fo rpo tentia l candida teYES

Delayed handover

decision?

C heck handoverparam eters

YES

In troduce unusedfeatu res

∙ T im er E xpiry A fte rM S is Lost

NO

D

NO

Handover – OptimizationD

C heck B TS E rro r Log

H Wfault?

C heck link qua lity

Transm issionfau lt?

S w ap & repa ir H WYES

NO

Im provetransm iss ion

YES

Perfo rm s ite v is it

NO

C heck an tennainsta lla tion

A ntenna connected tow rong feeder?

Incorrectdow ntilt?

H idedantenna?

B ad an tennainsta 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 te r-M S Cborder?

YES

C heck in te r-M S C H Operform ance

NO