| R4-021423 Response LS on Rate Adaptation of AMR Codec (TSG SA WG4, S4-020604)
This LS is sent to RAN WG2 cc RAN WG4 in response to R2-022423
SA WG4 agrees to add some text to the AMR specification clarifying that the code modes are configured by the UTRAN and the UE shall select a mode compatible with the radio conditions according to 25.133.
Concerning the issue of a rapid change in radio conditions, SA WG4 requires that the codec mode is changed step by step to avoid disruptions in the decoding.
NEC questioned whether it is possible for the UE to do the step by step AMR mode change with the current UE requirements in 25.133. Nokia agreed that this is an issue to look over, but it is not particularly urgent since it affects Rel5. NEC suggests to send a LS to SA4 to note that RAN WG4 needs to study the issue, although Nokia recommended to look at it first.
Decision: R4-021421 and R4-021423 are noted
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