Codec mode selection in EDGE AMR channels
Ulrich Fornefeld · 2003
We examine the dynamic behaviour of adaptive multi rate (AMR) traffic channels in an EDGE system. The goal of AMR is to provide optimum speech quality for any channel condition. A secure decision concerning the optimum codec mode is as important as a quick reaction to channel quality changes. It is shown that these competing demands cannot both be matched in all cases with the ETSI proposal (see ETSI TSG GERAN 09, Technical Specification 5.5.0, 2002). An extended algorithm for a better decision process is introduced.