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Content for  TS 26.202  Word version:  16.0.0

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1  ScopeWord‑p. 5
The present document specifies the mapping of the AMR wideband generic frame format (TS 26.201) to the Iu Interface (TS 25.415), the Uu Interface and the Nb Interface (TS 29.415) of a BICC-based circuit switched core network. It further specifies the mapping of PCM 64 kBit/s (ITU-T G.711) coded speech to the Nb Interface of a BICC-based circuit switched core network.
The mapping of the AMR wideband generic frame format to RTP for the A-Interface and the Nb Interface for a SIP-I -based circuit switched core network is described in TS 26.102.
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2  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]  TS 25.415   "Iu Interface CN-UTRAN User plane Protocols".
[2]  TS 26.201   "AMR Wideband Speech Codec, Frame structure".
[3]  TS 23.107   "QoS Concept and Architecture".
[5]  TS 28.062   " In-band Tandem Free Operation (TFO) of Speech Codecs, Stage 3".
[6]  TS 23.153   "Out of band transcoder control, Stage 2".
[6a]  TS 29.415   "Core Network Nb Interface User Plane Protocols".
[7]  ITU-T I.366.2: "AAL type 2 service specific convergence sublayer for trunking".
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3  Definitions and abbreviations

3.1  Definitions

For the purposes of the present document the following terms and definitions apply:
AMR Wideband Generic Frame Interface:
this interface transports the AMR-WB IF1 generic frame as defined in TS 26.201.

3.2  Abbreviations

For the purposes of the present document, the following abbreviations apply:
AAL2
ATM Adaptation Layer 2
ACS
Active Codec Set
AMR
Adaptive Multi-Rate
AS
Access Stratum
ATM
Asynchronous Transfer Mode
BFH
Bad Frame Handling
CMR/CMC
Codec Mode Request or Codec Mode Command
CMI
Codec Mode Indication
CN
Core Network
CDMA
Code Division Multiple Access
DRC
Downlink Rate Command
FDD
Frequency Duplex Division
FQC
Frame Quality Classification (Iu Interface)
FQI
Frame Quality Indication (AMR-WBIF1)
GSM
Global System for Mobile communications
ITU-T
International Telecommunication Union - Telecommunication standardisation sector (former CCITT)
MAC
Media Access Control
MGW
Media GateWay
PCM
Pulse Code Modulation, synonym for 64 kBit/s coded speech (see ITU-T G.711)
PLMN
Public Land Mobile Network
QoS
Quality of Service
RAN
Radio Access Network
RAB
Radio Access Bearer
RF
Radio Frequency
RFC
RAB sub-flow Combination
RFCI
RFC Indicator
RFCS
RFC Set
RX
Receive
SCR
Source Controlled Rate
SDU
Source Data Unit
SID
Silence Insertion Descriptor
SMpSDU
Support Mode for Predefined SDU sizes
SPD
SPeech Decoder
SPE
SPeech Encoder
TC
Transcoder
TDD
Time Duplex Division
TDMA
Time Division Multiple Access
TFO
Tandem Free Operation
TrFO
Transcoder Free Operation
TX
Transmit
UE
User Equipment (terminal)
URC
Uplink Rate Command
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4  GeneralWord‑p. 6
The mapping of the AMR-WB Speech Codec parameters to the Iu interface specifies the frame structure of the speech data exchanged between the RNC and the TC in case of normal operation and Tandem Free Operation, respectively between RNC 1 and RNC 2 in case of Transcoder Free Operation. This mapping is independent from the radio interface in the sense that it has the same structure for both FDD and TDD modes of the UTRAN.
The mapping between the Speech Codec and the Radio Access Network within the UE is not an open interface and need not to be detailed.
The mapping on the Nb Interface is identical to the one on the Iu Interface in case of Transcoder Free Operation, with the MGW relaying the SDUs unaltered between Iu and Nb Interfaces.
In case of transcoding within the MGW the PCM coded speech is mapped onto the Nb Interface in packets of 40 octets.
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