AMR Call Quality Measurement Based on ITU-T P.862.1 PESQ-LQO

Adaptive multi-rate (AMR) codecs are used popularly in most GSM and W-CDMA networks. This document describes the AMR call quality measurement results of PESQ-LQO (ITU-T P.862-1) based mean opinion score (MOS) vs. several key RF parameters under a controlled lab test environment. Frequency hopping and Rayleigh fading were included. The codecs that were evaluated include full rate 12.2, 7.4, 5.9, 4.75 and half rate 7.4, 5.9, 4.75. The RF parameters studied here were C/I, RXQUAL and FER MOS scores were collected via the tool based on the ITU P.862.1 PESQ-LQO algorithm. The radio link timer (RLT) was set 64 and the transmit power control (TPC) and discontinuous transmission (DTX) mechanisms were turned off for all fixed codec cases.