gsm kpi flow chart process
TRANSCRIPT
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