1、 ETSI TS 126 235 V12.0.0 (2014-10) Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Packet switched conversational multimedia applications; Default codecs (3GPP TS 26.235 version 12.0.0 Release 12) TECHNICAL SPECIFICATION ETSI ETSI TS 126
2、 235 V12.0.0 (2014-10)13GPP TS 26.235 version 12.0.0 Release 12Reference RTS/TSGS-0426235vc00 Keywords GSM,LTE,UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif en
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9、2014-10)23GPP TS 26.235 version 12.0.0 Release 12Intellectual 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
10、 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:/ipr.etsi.org). Pursuant to the ETSI IPR
11、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
12、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
13、 ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “may not“, “need“, “need not“, “will“, “will not“, “can
14、“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 126 235 V12.0.0 (2014-10)33GPP TS 26.235 version 12
15、.0.0 Release 12Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 General . 7g35 System overview 8g36 Functional requirements . 8g3
16、6.1 Audio 8g36.2 Video 8g36.3 Real time text . 9g36.4 Interactive and background data . 9g36.5 Speech Enabled Service . 9g37 Call control . 9g38 Bearer control . 9g39 Multimedia stream encapsulation . 10g39.1 MIME media types . 10g39.2 RTP payload . 10g3Annex A (informative): Information on optional
17、 enhancements . 11g3A.1 Video 11g3A.1.1 H.263 video codec 11g3A.2 Audio 11g3A.3 Text. 11g3Annex B (normative): AMR and AMR-WB RTP payload and MIME type registration . 12g3Annex C (normative): ITU-T H.263 MIME media type registration 13g3Annex D (informative): Push-to-Talk over cellular (PoC) 14g3Ann
18、ex E (informative): Change history . 16g3History 17g3ETSI ETSI TS 126 235 V12.0.0 (2014-10)43GPP TS 26.235 version 12.0.0 Release 12Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The present document introduces the set of default codecs apply
19、ing to 3G packet switched conversational multimedia applications within the 3GPP system. 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
20、 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 i
21、ncremented 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. Introduction The present document contains a specification for default multimedia codecs to be used wi
22、thin 3GPP specified IP Multimedia Subsystem (IM Subsystem). IM Subsystem as a subsystem includes specifically the conversational IP multimedia services, whose service architecture, call control and media capability control procedures have been defined in 3GPP specifications TS 24.229 15, and are bas
23、ed on the 3GPP adopted version of IETF Session Initiated Protocol (SIP). The term codec is usually associated with a single media type. In case of packet switched transport domain, which IM Subsystem will depend on, the individual media types are independently encoded and packetised to appropriate s
24、eparate Real Time Protocol (RTP) packets. These packets are then transported end-to-end inside UDP datagrams over real-time IP connections that have been negotiated and opened between the terminals during the SIP call as specified in 3GPP TS 24.229 15. From the codec definition viewpoint, the UEs op
25、erating within IM Subsystem need to provide encoding/decoding of the derived codecs, and perform corresponding packetisation/depacketisation functions. Logical bound between the media streams is handled in the SIP session layer, and inter-media synchronisation in the receiver is handled with the use
26、 of RTP time stamps. Finally, since 3GPP networks are inherently error prone, error detection and/or correction must also be provided by the individual codecs within IM Subsystem, since they have a comprehensive view of the bit stream they produce and therefore can apply the most efficient form of e
27、rror detection and/or correction. ETSI ETSI TS 126 235 V12.0.0 (2014-10)53GPP TS 26.235 version 12.0.0 Release 121 Scope The present document introduces the set of default codecs for packet switched conversational multimedia applications within 3GPP IP Multimedia Subsystem. Visual and sound communic
28、ation are specifically addressed. The intended applications are assumed to require low-delay, real-time functionality. The present document is applicable, but not limited, to services such as PS video telephony and Push to talk over Cellular (PoC) as well as Combined CS and IMS services (CSI). For M
29、ultimedia Telepphony Service for IMS (MTSI), all media handling, including codecs, is defined in TS 26.114 50. This specification does not apply for MTSI. The applicability of this specification to GERAN is FFS. 2 References The following documents contain provisions which, through reference in this
30、 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 th
31、e 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 IETF RFC 3261: “SIP: Session Initiation Protocol“. 2 IETF RFC 4566: “SDP: Session Description Protocol
32、“. 3 IETF RFC 2429: “RTP Payload Format for the 1998 Version of ITU-T Rec. H.263 Video (H.263+)“. 4 IETF RFC 3550: “RTP: A Transport Protocol for Real-Time Applications“, Schulzrinne H. et al, July 2003. 5 IETF RFC 3016: “RTP Payload Format for MPEG-4 Audio/Visual Streams“. 6 ITU-T Recommendation H.
33、263 (02/98): “Video coding for low bit rate communication“. 7 3GPP TS 26.110: “Codec for Circuit Switched Multimedia Telephony Service; General Description“. 8 3GPP TS 26.111: “Codec for Circuit Switched Multimedia Telephony Service; Modifications to H.324“. 9 3GPP TS 26.071: “Mandatory Speech Codec
34、 speech processing functions; AMR Speech Codec; General description“. 10 3GPP TS 26.090: “Mandatory Speech Codec speech processing functions; AMR Speech Codec; Transcoding functions“. 11 3GPP TS 26.073: “Adaptive Multi-Rate (AMR); ANSI C source code“. 12 3GPP TS 26.104: “ANSI-C code for the floating
35、-point AMR speech codec“. 13 ISO/IEC 14496-2 (2004): “Information technology - Coding of audio-visual objects - Part 2: Visual“. 14 (void) 15 3GPP TS 24.229: “IP Multimedia Call Control Protocol based on SIP and SDP“. 16 3GPP TS 26.171 (Release 5): “AMR speech codec, wideband; General description“.
36、ETSI ETSI TS 126 235 V12.0.0 (2014-10)63GPP TS 26.235 version 12.0.0 Release 1217 3GPP TS 26.190 (Release 5): “Mandatory Speech Codec speech processing functions AMR Wideband speech codec; Transcoding functions“. 18 3GPP TS 26.201 (Release 5): “AMR speech codec, wideband; Frame structure“. 19 ITU-T
37、Recommendation H.263 Annex X (03/04): “Annex X: Profiles and levels definition“. 20 3GPP TS 23.228: “IP multimedia subsystem; stage 2“. 21 3GPP TS 23.107: “QoS Concept and Architecture“. 22 3GPP TS 23.207: “End to end quality of service concept and architecture“. 23 3GPP TS 23.060: “General Packet R
38、adio Service (GPRS); Service description; Stage 2“. 24 Void 25 ITU-T Recommendation T.140 (1998): “Protocol for multimedia application text conversation“ (with amendment 2000). 26 3GPP TS 26.101: “Mandatory Speech Codec speech processing functions; AMR Speech Codec; Frame Structure“. 27 IETF RFC 211
39、9: “Key words for use in RFCs to Indicate Requirement Levels“. 28 3GPP TS 26.093: “Mandatory Speech Codec speech processing functions; AMR Speech Codec; Source Controlled Rate operation“. 29 3GPP TS 46.060: “Enhanced Full Rate (EFR) speech transcoding“. 30 TIA/EIA -136-Rev.A, part 410 - “TDMA Cellul
40、ar/PCS Radio Interface, Enhanced Full Rate Voice Codec (ACELP). Formerly IS-641. TIA published standard, 1998“. 31 ARIB, RCR STD-27H, “Personal Digital Cellular Telecommunication System RCR Standard“. 32 IETF draft-westberg-realtime-cellular-01.txt, “Realtime Traffic over Cellular Access Networks“.
41、33 IETF draft-larzon-udplite-03.txt, “The UDP Lite Protocol“. 34 3GPP TS 26.092: “Mandatory Speech Codec speech processing functions; AMR Speech Codec; Comfort noise aspects“. 35 IETF RFC 4867: “RTP payload format and file storage format for the Adaptive Multi-Rate (AMR) Adaptive Multi-Rate Wideband
42、 (AMR-WB) audio codecs“, April 2007. 36 IETF RFC 2833: RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals, May 2000. 37 3GPP TS 26.243: ANSI C code for the Fixed-Point Distributed Speech Recognition Extended Advanced Front-end. 38 IETF RFC 4060 “RTP Payload Formats for European Telec
43、ommunications Standards Institute (ETSI) European Standard ES 202 050, ES 202 211, and ES 202 212 Distributed Speech Recognition Encoding“. 39 3GPP TS 26.173: “ANCI-C code for the Adaptive Multi Rate - Wideband (AMR-WB) speech codec“. 40 3GPP TS 26.204: “ANSI-C code for the Floating-point Adaptive M
44、ulti-Rate Wideband (AMR-WB) speech codec“. 41 ITU-T Recommendation H.264 (2003): “Advanced video coding for generic audiovisual services“ | ISO/IEC 14496-10:2003: “Information technology Coding of audio-visual objects Part 10: Advanced Video Coding“. 42 ISO/IEC 14496-10/FDAM1: “AVC Fidelity Range Ex
45、tensions“. ETSI ETSI TS 126 235 V12.0.0 (2014-10)73GPP TS 26.235 version 12.0.0 Release 1243 IETF RFC 3984 (2005): “RTP Payload Format for H.264 Video“, S. Wenger, M.M. Hannuksela, T. Stockhammer, M. Westerlund and D. Singer. 44 3GPP TS 23.221: Architectural requirements. 45 3GPP TR 26.943: Recognit
46、ion performance evaluations of codecs for Speech Enabled Services(SES); (Release 6). 46 3GPP TS 22.279: Combining CS and IMS services; Stage 1. 47 3GPP TS 23.279: Combining CS and IMS services; Stage 2. 48 3GPP TS 26.141: IP Multimedia System (IMS) Messaging and Presence; Media formats and codecs. 4
47、9 IETF RFC 4103 “RTP payload for text conversation“. 50 3GPP TS 26.114, IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and interaction. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply.: 3G PS mul
48、timedia terminal: terminal based on IETF SIP/SDP internet standards modified by 3GPP for purposes of 3GPP packet switched network based multimedia telephony 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AMR Adaptive MultiRate codec AVC Advanced Video
49、Codec CSI Combination of CS and IMS services DSR Distributed Speech Recognition IETF Internet Engineering Task Force IM Subsystem Internet protocol Multimedia Subsystem ITU-T International Telecommunications Union-Telecommunications MTSI Multimedia Telephony Service for IMS PoC Push to talk over Cellular RFC IETF Request For Comments RTCP RTP Control Protocol RTP Real-time Transport Protocol SDP Session Description Protocol SES Speech Enabled
