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WhyperformaDrivetest? EveryaliveNetworkneedstobeundercontinues

contro tomaintain/improvet eper ormance.

Optimization

is

basically

the

only

way

to

keep

track

of

collecting/analyzingdrivetestdata.

Driv t sth l so r tion ndm int n nc for

troubleshootingpurposes.

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GSMParameters RxLevel

RxQuality

FrameErasure

Rate

(FER

)

BitErrorRate(BER)

Carrier toInterferer(C/I)

SpeechQuality

Index

SQI

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RxLevel

Thepower

level

corresponding

to

the

average

received

signallevelofthedownlinkasmeasuredbythemobile.

NormalRangeisfrom 30to 70.

.

Amplifiers,Newsiteproposal,Hardwarecheckcouldlt rth lowsi n ll v l .

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RxQuality

Thelevel

corresponding

to

the

mobile

station's

perceivedqualityofthedownlinksignal.

Norma rangeis rom0to4.

Quality

higher

than

4

can

result

in

Call

drops,

Call

, , , .

Numerousalternativescouldbeusedtomaketheu lit norm lwhichc ninclud s ttin RF

parametersfromOMC.

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FrameErasureRate(FER)

Aspeech

quality

degrade

factor

that

indicates

fading

andinterference.

Norma ys ou e esst an4%.

FER

greater

than

4%

that

degrades

RxLevel,

RxQuality,

,drops,Callblocks,MutedcallsandHandoverfailures.

FER l s m orrol introubl shootin ofInterference.

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BitErrorRate(BER)

The

number

of

received

bits

that

have

been

altered

duetonoise,interferenceanddistortion,dividedby

timeinterval.

, .

LossofbitscanresultinfadingandinterferencethatleadstoCalldrops,Callblocks,Mutedcallsand

Handoverfailures.

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CarriertoInterferer(C/I)

Cochannel

interference

is

the

term

used

for

interferenceinacellcausedbycarrierswiththesamey .

NormalRangeofC/Ishouldbegreaterthan12dB.

certainfrequencythatcouldbecochanneloradjacentchannelinterference.

Neighborsites

should

be

properly

planned

to

overcomeinterferenceproblems.

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SpeechQualityIndex(SQI)

SQI

is

an

estimate

of

the

perceived

speech

quality

as

experiencedbythemobileuser,isbasedonhandoverv

distributions.

.

LowSQIindicatesdegradedspeechqualityandinterference.

RFparameter

tuning

could

level

the

SQI

back

to

its

normalvalue.

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CDMAParameters RxLevel

TxPower

Carrier

Energy

to

Interference(

Ec/Io

)

Carrier toInterferer(C/I)

SignaltoNoiseRatio(SNR)

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RxLevel

The

power

level

corresponding

to

the

average

received

signallevelofthedownlinkasmeasuredbythemobile.

NormalRangeisfrom 30to 80.

.

Newsiteproposal,Hardwarecheckcouldalterthelowsi n ll v l .

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TxPower

TxPowerControldetermineshowthetransmitpowero t ereceiving asestationwi vary.

TxPower

should

be

upto

20. a ue esst an 20w n cate nter erencet atcan

resultinCalldrops,Callblocks,Voicebreaks.

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CarrierEnergytoInterference(Ec/Io) Theratioofreceivedpilotenergy,Ec,tototalreceived

energyort etota powerspectra ensity,Io.

Ec/Io

should

be

upto

13dB. a ues esst an 13 cou e ueto a terra n,

interferenceorincreasednumberofusers.

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CarriertoInterferer(C/I)

Cochannel

interference

is

the

term

used

for

interferenceinacellcausedbycarrierswiththesamey .

NormalRangeofC/Ishouldbelessthan12dB.

certainfrequencythatresultsinalowthroughput.

N i hborsit sshouldb ro rl l nn dtoovercome

interference

problems.

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SignaltoNoiseRatio(SNR) SignaltoNoiseratioofthecarrier.

SNRshouldbelessthan6%.

Values

higher

than

that

will

result

in

low

throughput,

vo cequa ty rea s

22May2010 15MadeBy:KhalidMahmood