Abbreviations and Acronyms

CoDec

Codifier/De-codifier.

CPICH RSCP

Common Pilot Channel, Received Signal Code Power – Level of the signal received by a mobile terminal (WCDMA).

ETSI

European Telecommunications Standards Institute.

GSM

Global System for Mobile communications – Second generation (2G) Mobile Communications System.

ITU

International Telecommunications Union.

MOS

Mean Opinion Score – Quality rate quantifying the effort to understand an end-to-end type conversation. Its limits are 0 (zero) when there is no communication and 5 (five) when the communication is perfect.  The value “zero” never shows in the results since only connections that are established and maintained for a given period are considered. “Five” never shows in the results either, because the CoDec used by mobile networks does not allow such high voice or Visual Quality ratings (the voice or Visual Quality reached with the CoDec usually used gives MOS values lower than 4.5).

PESQ

Perceptual Evaluation of Speech Quality – Algorithm used to analyse the Listening Quality of a voice communication (Recommended by ITU: ITU-T Recommendation P.862 (02/2001); ITU-T Recommendation P.862.1 (11/2003)).

ISDN

Integrated Services Digital Network – Technology used on the fixed access network.

RF

Radio Frequency.

RxLev

Received signal level, at a mobile (GSM) terminal.

s

Second - time unit.

Scanner

Measuring equipment that collects radio signal levels for each channel of a frequency band.

SQuad-LQ

SwissQual’s speech quality algorithm for Listening Quality – Algorithm developed by SwissQual to analyse the Listening Quality of a communication.

UMTS

Universal Mobile Telecommunications System – Third generation (3G) Mobile Communications System.

VQuad

Objective Model for Visual Quality Assessment – Algorithm used to analyse the Visual Quality of a communication (developed by SwissQual).

WCDMA

Wideband Code Division Multiple Access – Technology used in the radio component of the UMTS communications systems.