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Technical Specification
Digital cellular telecommunications system (Phase 2+);
Universal Mobile Telecommunications System (UMTS);
LTE;
Speech codec speech processing functions;
Adaptive Multi-Rate - Wideband (AMR-WB) speech codec;
Interface to Iu, Uu and Nb
(3GPP TS 26.202 version 8.0.0 Release 8)
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3GPP TS 26.202 version 8.0.0 Release 8 1 ETSI TS 126 202 V8.0.0 (2009-01)
Reference
RTS/TSGS-0426202v800
Keywords
GSM, LTE, UMTS
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3GPP TS 26.202 version 8.0.0 Release 8 2 ETSI TS 126 202 V8.0.0 (2009-01)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
ETSI
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3GPP TS 26.202 version 8.0.0 Release 8 3 ETSI TS 126 202 V8.0.0 (2009-01)
Contents
Intellectual Property Rights.2
Foreword.2
Foreword.4
1 Scope.5
2 References.5
3 Definitions and abbreviations.5
3.1 Definitions.5
3.2 Abbreviations.5
4 General.6
5 RAB aspects.6
6 Iu Interface User Plane (RAN).8
6.1 Frame structure on the Iu UP transport protocol .8
6.1.1 Initialisation .8
6.1.2 Time Alignment Procedure.8
6.2 Mapping of the bits.8
6.3 Frame handlers.9
6.3.1 Handling of frames from TC to Iu interface (downlink).10
6.3.1.1 Frame Quality Indicator .10
6.3.1.2 Frame Type.10
6.3.1.3 Codec Mode Indication.10
6.3.1.4 Codec Mode Request .10
6.3.1.5 Optional internal 8 bits CRC.10
6.3.1.6 Mapping of Speech or Comfort Noise parameter bits.10
6.3.2 Handling of frames from Iu interface to TC (uplink) .11
6.3.2.1 Frame Quality Indicator .11
6.3.2.2 Frame Type.11
6.3.2.3 Codec Mode Indication.11
6.3.2.4 Codec Mode Request .11
6.3.2.5 Optional internal 8 bits CRC.11
6.3.2.6 Speech and Comfort noise parameter bits.11
7 Uu Interface User Plane (UE) .11
8 Nb Interface User Plane (CN) .12
8.1 Frame structure on the Nb UP transport protocol.12
8.1.1 Initialisation .12
8.1.2 Time Alignment Procedure.12
8.2 Mapping of the bits.12
8.2.1 Mapping for AMR-WB frames.12
8.2.2 Mapping for PCM Coded Speech .12
8.3 Frame handlers.12
Annex A (informative): Change history .13
History .14
ETSI
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3GPP TS 26.202 version 8.0.0 Release 8 4 ETSI TS 126 202 V8.0.0 (2009-01)
Foreword
rd
This Technical Specification (TS) has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
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3GPP TS 26.202 version 8.0.0 Release 8 5 ETSI TS 126 202 V8.0.0 (2009-01)
1 Scope
The present document specifies the mapping of the AMR wideband generic frame format (3GPP TS 26.201) to the Iu
Interface (3GPP TS 25.415), the Uu Interface and the Nb Interface (3GPP 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.
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.
[1] 3GPP TS 25.415: "Iu Interface CN-UTRAN User plane Protocols".
[2] 3GPP TS 26.201: "AMR Wideband Speech Codec, Frame structure".
[3] 3GPP TS 23.107: "QoS Concept and Architecture".
[5] 3GPP TS 28.062: " In-band Tandem Free Operation (TFO) of Speech Codecs, Stage 3".
[6] 3GPP TS 23.153: "Out of band transcoder control, Stage 2".
[6] 3GPP 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".
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
3GPP 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
ETSI
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3GPP TS 26.202 version 8.0.0 Release 8 6 ETSI TS 126 202 V8.0.0 (2009-01)
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
4 General
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 unalte
...