1 Scope

05.093GPPLink adaptationRelease 1999TS

The requirements described in the present document are mandatory for implementation in all GSM MSs and BSSs capable of supporting the Adaptive Multi-Rate speech traffic channel, unless otherwise stated.

Unless otherwise specified, references to GSM include GSM at any frequency band.

1.1 References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

  • References are either specific (identified by date of publication, edition number, version number, etc.) or non‑specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

[1] GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms".

[2] GSM 04.08: "Digital cellular telecommunications system (Phase 2+); Mobile radio interface layer 3 specification".

[3] GSM 05.02: "Digital cellular telecommunications system (Phase 2+); Multiplexing and multiple access on the radio path".

[4] GSM 05.03: "Digital cellular telecommunications system (Phase 2+); Channel Coding".

[5] GSM 05.05: "Digital cellular telecommunications system (Phase 2+); Radio transmission and reception".

[6] GSM 08.08: "Digital cellular telecommunications system (Phase 2+); Mobile-services Switching Centre – Base Station System (MSC – BSS) interface, Layer 3 specification".

[7] GSM 08.62: "Digital cellular telecommunications system; Inband Tandem Free Operation (TFO) of Speech Codecs".

1.2 Abbreviations

For the purposes of the present document, the following abbreviations apply. Further GSM related abbreviations are listed in GSM 01.04.

AMR Adaptive Multi-Rate

ACS Active Codec Set

CMC Codec Mode Command

CMI Codec Mode Indication

CMR Codec Mode Request

ICM Initial Codec Mode

RATSCCH Robust AMR Traffic Synchronized Control Channel