The present document describes the protocol between the Base Transceiver Station (BTS) and the remote Transcoder/Rate Adaption Unit (TRAU) for speech and data on half rate traffic channel (TCH/H).
For Half Rate speech and half rate data the protocol is specified for 8 kbit/s and 16 kbit/s submultiplexing scheme.
For Adaptive Multi-Rate speech the present document specifies the 8 kBit/s submultiplexing, both for the full and the half rate traffic channels (TCH/AFS and TCH/AHS). The specification for 16 kBit/s submultiplexing is given in Rec TS 48.060
, both for the full and the half rate traffic channels (TCH/AFS and TCH/AHS).
The present document should be considered together with the 3GPP TS 46 series, TS 44.021
(Rate Adaption on the MS BSS Interface) and TS 48.020
(Rate Adaption on the BTS/MSC Interface).
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.
GSM TS 01.02: "Digital cellular telecommunication system (Phase 2+); General description of a GSM Public Land Mobile Network (PLMN)".
: "Vocabulary for 3GPP Specifications".
: "Rate adaption on the Mobile Station - Base Station System (MS BSS) interface".
: "Half rate speech; Substitution and muting of lost frames for half rate speech traffic channels".
: "Half rate speech; Comfort noise aspects for half rate speech traffic channels".
: "Half rate speech; Discontinuous Transmission (DTX) for half rate speech traffic channels".
: "Half rate speech; Voice Activity Detector (VAD) for half rate speech traffic channels".
: "Mobile-services Switching Centre - Base Station System (MSC-BSS) interface; Layer 3 specification".
: "Rate adaption on the Base Station System Mobile services Switching Centre (BSS MSC) interface".
: "Base Station Controller Base Transceiver Station (BSC BTS) interface; Interface principles".
: "Base Station Controller - Base Transceiver Station (BSC - BTS) interface Layer 1 structure of physical circuits".
: "Base Station Controller Base Transceiver Station (BSC BTS) interface; Layer 3 specification".
GSM TS 12.21: "Digital cellular telecommunication system (Phase 2); Network Management (NM) procedures and messages on the A bis interface".
ITU T Recommendation I.460: "Multiplexing, rate adaption and support of existing interfaces".
ITU T Recommendation V.110: "Support of data terminal equipments (DTEs) with V Series interfaces by an integrated services digital network".
: "Adaptive Multi-Rate speech processing functions, General Description."
: "Adaptive Multi-Rate speech transcoding".
: "Comfort noise aspect for Adaptive Multi-Rate speech traffic channels".
: "Inband control of remote transcoders and rate adaptors".
TS 48.062: "Inband Tandem Free Operation (TFO) of Speech Codecs".
→ to date, withdrawn by 3GPP
No specific definitions apply to the present document.
For the purposes of the present document, the following abbreviations apply:
Base Station Controller
Base Transceiver Station
Channel Codec Unit
Downlink Frame Error
Phase Alignment Bit
Phase Alignment Command
Request or Indication Flag
Time Alignment Command
Time Alignment Extension
Tandem Free Operation
Transcoder and Rate Adaption Unit
Uplink Frame Error
Other abbreviations used in the present document are listed in TR 21.905