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Mean Rx power Average receiver power, signal strength of signal

received by mobile phone

Ec/Io This is the ratio of the received energy per chip (=

code bit) and the interference level, usually given

in dB. In case no true interference is present, the

interference level is equal to the noise level.

Mean tx power Average transmitter power.

RSCP The Received Signal Code Power (RSCP) is the

collected RF energy after the correlation /

descrambling process, usually given in dBm. Only

this code power is of interest for the following

receiver stages when judging on the quality of the

reception.

RSSI (RxLev) The Received Signal Strength Indicator (RSSI) is a

value that takes into account both RSCP and Ec/I0.

It is usually given in dBm and can be calculated as

follows: RSSI [dBm] = RSCP [dBm] Ec/I0 [dB]

MOS

DL = Downlink

UL = Uplink

In voice and video communication, quality usually

dictates whether the experience is a good or bad

one. Besides the qualitative description we hear,

like 'quite good' or 'very bad', there is a numerical

method of expressing voice and video quality. It is

called Mean Opinion Score (MOS). MOS gives a

numerical indication of the perceived quality of

the media received after being transmitted and

eventually compressed using codecs.

MOS is expressed in one number, from 1 to 5, 1

being the worst and 5 the best. MOS is quite

subjective, as it is based figures that result from

what is perceived by people during tests. However,

there are software applications that measure MOS

on networks, as we see below.

The Mean Opinion Score Values

Taken in whole numbers, the numbers are quite

easy to grade.

y 5 - Perfect. Like face-to-face conversation orradio reception.

y 4 - Fair. Imperfections can be perceived, but

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sound still clear. This is (supposedly) the range

for cell phones.

y 3 - Annoying.y 2 - Very annoying. Nearly impossible to

communicate.

y 1 - Impossible to communicateThe values do not need to be whole numbers.

Certain thresholds and limits are often expressed

in decimal values from this MOS spectrum. For

instance, a value of4.0 to 4.5 is referred to as toll-

quality and causes complete satisfaction. This is

the normal value of PSTN and many VoIP services

aim at it, often with success. Values dropping

below 3.5 are termed unacceptable by many users.

Accessiblity Percenatage of calls completed out of total calls

made.reasons for call not completed

No service

Poor signal

Access time out

Congestion

Assignment failure

Call failure

Network failure

No communication

Retainbility Percatange of long calls terminated on normal

routine

Total percentage of blocked calls

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Call Attempts Number of calls made to the network

NO service No signal at all

Poor signal Very poor reception to intiate a call

Access timeout Call couldnot be initiated in certain fixed access

time allowed by network=

Congestion Network capacity full

Assignment failure No assignment of SACH

Call Failure

Network failure Issues in MSC switching

No communication Call connected but could not listen the voice

Frame Erasure Rate, FER is defined as the amount of swept speech frames

(260 bits each)

divided by the amount of transmitted speech

frames

RxQual/ECNOis used in GSM and is a part of the Network

Measurement Reports (NMR).[1]

This is an integer the value of which can be

between 0 and 7 and reflects the quality of voice.

0 is the best quality, 7 is the worst.

BLERBlock Error Rate (BLER) is used in measuring the

error rate when extracting data frames

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