1、 ETSI TS 126 236 V12.0.0 (2014-10) Universal Mobile Telecommunications System (UMTS); LTE; Packet switched conversational multimedia applications; Transport protocols (3GPP TS 26.236 version 12.0.0 Release 12) TECHNICAL SPECIFICATION ETSI ETSI TS 126 236 V12.0.0 (2014-10)13GPP TS 26.236 version 12.0
2、.0 Release 12Reference RTS/TSGS-0426236vc00 Keywords 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 enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Im
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6、/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified
7、 without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2014. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of i
8、ts Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 126 236 V12.0.0 (2014-10)23GPP TS 26.236 version 12.0.0 Release 12Intel
9、lectual 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 Righ
10、ts (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 Policy, no investigation, including IPR searches, has
11、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
12、 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, U
13、MTS, 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“ and “cannot“ are to be interpreted as described in c
14、lause 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 126 236 V12.0.0 (2014-10)33GPP TS 26.236 version 12.0.0 Release 12Contents Intellectual Property Rights 2
15、g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 General . 7g35 Media type requirements 8g35.1 Audio 8g35.1.1 RTP session description parameters . 8g35.1.1.1 Parameter
16、usage in an SDP offer . 8g35.1.1.2 Construction of an SDP answer 9g35.1.2 RTP session description parameters for PoC 10g35.2 Video 10g35.3 Real time text . 10g35.4 SES . 10g36 Call control . 10g37 Bearer control . 10g37.1 Bandwidth 11g37.2 QoS negotiation 11g37.3 RTP receiver . 11g37.4 RTP sender .
17、11g3Annex A (informative): Optional enhancements . 13g3A.1 Video enhancements. 13g3Annex B (informative): Mapping of SDP parameters to UMTS QoS parameters . 14g3Annex C (informative): Change history . 20g3History 21g3ETSI ETSI TS 126 236 V12.0.0 (2014-10)43GPP TS 26.236 version 12.0.0 Release 12Fore
18、word This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The present document specifies the codec specific RTP protocol details applying to packet switched conversational multimedia applications within the 3GPP IM Subsystem. The contents of the present doc
19、ument 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
20、: 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 in
21、cremented when editorial only changes have been incorporated in the document. Introduction The present document contains a specification for required protocol usage within 3GPP specified Conversational Packet Switched Multimedia Services 5 which is based IP Multimedia Subsystem (IM Subsystem). IM Su
22、bsystem 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 TS 24.229 7, and are based on the 3GPP adopted version of IETF Session Initiated Protocol (SIP) 1. In con
23、versational packet switched multimedia service depends on IM Subsystem. The individual media types are independently encoded and packetized to appropriate separate Real Time Protocol (RTP) packets. These packets are then transported end-to-end inside UDP datagrams over real-time IP connections that
24、have been negotiated and opened between the terminals during the SIP call as specified in 3GPP TS 24.229 7. The UEs operating within IM Subsystem need to provide encoding/decoding of the derived codecs, and perform corresponding packetization/depacketization functions. Logical bound between the medi
25、a streams is handled in the SIP session layer, and inter-media synchronization in the receiver is handled with the use of RTP time stamps. ETSI ETSI TS 126 236 V12.0.0 (2014-10)53GPP TS 26.236 version 12.0.0 Release 121 Scope The present document introduces the required protocols for packet switched
26、 conversational multimedia applications within 3GPP IP Multimedia Subsystem. Visual and sound communications are specifically addressed. The intended applications are assumed to require low-delay, real-time functionality. The present document describes the required protocol related elements for 3G P
27、S multimedia terminal: required SDP signalling regarding the media type bit rate, packet size, packet transport frequency; usage of RTP payload for media types; bandwidth adaptation; QoS negotiation. The present document is applicable, but not limited, to packet switched video telephony. All media h
28、andling, including codecs, for Multimedia Telephony Service for IMS (MTSI) service is defined in 35. This specification does not apply to MTSI. The applicability of the present document to GERAN is FFS. 2 References The following documents contain provisions which, through reference in this text, co
29、nstitute 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
30、 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“. 3 IETF
31、 RFC 3550: “RTP: A Transport Protocol for Real-Time Applications“, Schulzrinne H. et al, July 2003. 4 IETF RFC 3551: “RTP Profile for Audio and Video Conferences with Minimal Control“, Schulzrinne H. and Casner S., July 2003. 5 3GPP TS 26.235: “Packet switched conversational multimedia applications;
32、 Default codecs“. 6 (void) 7 3GPP TS 24.229: “IP multimedia call control protocol based on SIP and SDP“. 8 3GPP TS 23.228: “IP Multimedia Ssubsystem (IMS); Stage 2“. 9 3GPP TS 23.107: “Quality of Service (QoS) concept and architecture“. 10 3GPP TS 23.207: “End to end quality of service concept and a
33、rchitecture“. 11 3GPP TS 23.060: “General Packet Radio Service (GPRS); Service description; Stage 2“. 12 3GPP TS 26.071: “Mandatory Speech Codec speech processing functions; AMR Speech Codec; General description“. ETSI ETSI TS 126 236 V12.0.0 (2014-10)63GPP TS 26.236 version 12.0.0 Release 1213 3GPP
34、 TS 26.090: “AMR speech Codec; Transcoding Functions“. 14 3GPP TS 26.073: “AMR speech Codec; C-source code“. 15 3GPP TS 26.104: “ANSI-C code for the floating-point Adaptive Multi-Rate AMR speech codec“. 16 3GPP TS 26.171 (Release 5): “AMR speech codec, wideband; General description“. 17 3GPP TS 26.1
35、90 (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 IETF RFC 4867: “RTP payload format and file storage format for the Adaptive Multi-Rate (AMR) Adaptiv
36、e Multi-Rate Wideband (AMR-WB) audio codecs“, April 2007. 20 ITU-T Recommendation H.263: “Video coding for low bit rate communication“. 21 IETF RFC 2429: “RTP Payload Format for the 1998 Version of ITU-T Rec. H.263 Video (H.263+)“. 22 ISO/IEC 14496-2 (1999): “Information technology - Coding of audio
37、-visual objects - Part 2: Visual“. 23 IETF RFC 3016: “RTP Payload Format for MPEG-4 Audio/Visual Streams“. 24 ITU-T Recommendation H.263 (annex X): “Annex X: Profiles and levels definition“. 25 3GPP TS 26.235: “Packet Switched Conversational Multimedia Applications; Default Codecs “. Annex C: “ITU-T
38、 H.263 MIME media type registration“. 26 ITU-T Recommendation T.140 (1998): “Protocol for multimedia application text conversation“ (with amendment 2000). 27 Void 28 IETF RFC 3556: “Session Description Protocol (SDP) Bandwidth Modifiers for RTP Control Protocol (RTCP) bandwidth“, Casner S., July 200
39、3. 29 IETF RFC 4060 “RTP Payload Formats for European Telecommunications Standards Institute (ETSI) European Standard ES 202 050, ES 202 211, and ES 202 212 Distributed Speech Recognition Encoding“. 30 Open Mobile Alliance: PoC User Plane Version 1, Draft Version 1.0.10 Nov 2004, OMA-UP-PoC-V1_0_10-
40、20041103-D. 31 3GPP TS 26.103: “Speech codec list for GSM and UMTS“. 32 IETF RFC 4103 “RTP Payload for Text Conversation“. 33 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 Pa
41、rt 10: Advanced Video Coding“. 34 IETF RFC 3984 (2005): “RTP Payload Format for H.264 Video“, S. Wenger, M.M. Hannuksela, T. Stockhammer, M. Westerlund and D. Singer. 35 3GPP TS 26.114, IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and interaction. ETSI ETSI TS 126 236 V12.0.0
42、(2014-10)73GPP TS 26.236 version 12.0.0 Release 123 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following term and definition applies: 3G PS multimedia terminal: terminal based on IETF SIP/SDP internet standards modified by 3GPP for purposes of 3GPP IM
43、 Subsystem services 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AMR Adaptive MultiRate codec DSR Distributed Speech Recognition IETF Internet Engineering Task Force IM Subsystem Internet protocol Multimedia Subsystem ITU-T International Telecommunic
44、ations Union-Telecommunications MTSI Multimedia Telephony Service for IMS NAT Network Address Translation RFC IETF Request For Comments RTPCP RTP Control Protocol RTP Real-time Transport Protocol SDP Session Description Protocol SES Speech Enabled Service SIP Session Initiation Protocol 4 General 3G
45、 PS multimedia terminals provide real-time video, audio, SES or data, in any combination, including none, over 3GPP IM Subsystem. Terminals are based on IETF defined multimedia protocols SIP, SDP, RTP and RTCP. Communication may be either 1-way or 2-way. Such terminals may be part of a portable devi
46、ce or integrated into an automobile or other non-fixed location device. They may also be fixed, stand-alone devices; for example, a video telephone or kiosk. Multimedia terminals may also be integrated into PCs and workstations. In the case of SES then uplink communication is from the terminal to a
47、server containing speech recognition. The transmission and reception of audio in Push-to-Talk over Cellular (PoC) communication is controlled by a RTCP APP conveyed Talk Burst Control Protocol defined in OMA PoC User Plane Version 1 30. In addition, interoperation with other types of multimedia tele
48、phone terminals, such as 3G-324M may be possible, however in such case a media gateway functionality supporting 3G-324M - IM Subsystem interworking will be required within or outside the IM subsystem. Figure 1 presents the user plane protocol stack of a 3G PS conversational multimedia terminal expla
49、ining the transport of different media types and QoS reports. ETSI ETSI TS 126 236 V12.0.0 (2014-10)83GPP TS 26.236 version 12.0.0 Release 12IPUDPRTPRTCPPayload formatsAudio Video TextConversational Multimedia ApplicationFigure 1 User plane protocol stack for 3G PS conversational multimedia terminal 5 Media type requirements Media type RTP payload usage is specified in this clause. The media types and corresponding codecs are specified in 3GPP TS 26.235 5. The continuou
