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7/25/2019 61865679 Drop Call Analysis
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Drop Calls on TCH
Drop Calls on TCH
Bad LocatingParameter Setting?
Correct Parameter Setting
Perform
Interference Analysis
Y
N
Check Output Po er
Is Po er !egulationused properly?
Correct po er regulationparameter
Is the Po erBalanced?
Ad"ust output po er
Is #$% &sed? Introduce #$%
Y
N
Is 're(uency)opping used?
Acti*ate 're(uency)opping
Check #ropped call reason
Bad +uality?
Lo SignalStrength?
Perform lo SignalStrength Analysis
$iming Ad*ance? Check site location, $ALI-
Sudden #rop?Check reason for sudden
loss
Other?In*estigate possi.le
)ard are fault
B
N
N
N
Y
Y
Y
Y
Y
Y
Y
Y
N
N
N
N
N
/N#
B
Check Lost )ando*er
-ost dropped callsduring hando*er?
Perform )ando*er Analysis
Check Site Position
#rag on Site?!emo*e site or change
fre(uency
Check B$S /rror Log
)0 'ault?S ap , repair )0
Check link (uality ,synchroni1ation
$ransmission'ault?
Perform link in*estigation
Best ser*er e2ists?
Check -S Pro.lem
Add site
Perform dri*e test
Perform C$! recordings
Perform site sur*ey
Check Antenna installation
Y
Y
Y
Y
N
N
N
N
N
Y
7/25/2019 61865679 Drop Call Analysis
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'rom technical perspecti*e3 dropped call sho the num.er of a.normal disconnection4s during call setup3 S-S3supplementary ser*ice acti*ation or during con*ersation5 $hey are a fe different counters for dropped calls3 i5e5dropped calls due to lo signal strength3 .ad (uality3 too high timing ad*ance and miscellaneous is used to get anindication of the reason for possi.le .ad performance5
'rom a su.scri.er point of *ie 3 dropped calls are those that interrupt an ongoing con*ersation3 i5e5 a call droppedon the $C)5 If the call is dropped on the S#CC) the user simply re6dials again and hopefully succeeds ith the
ne call setup5 'or this analysis e ill focus on the drop call on the $raffic Channel 7$C)85$C) drop call can .e di*ided into a fe categories9
:5 /2cessi*e $iming Ad*ance2. Lo Signal Strength ; &L