1、 ETSI TR 1Universal Mobile TelMultimedia telephony Media handling asconferencing for Multim(3GPP TR 26.9TECHNICAL REPORT 126 980 V13.0.0 (2016elecommunications System (LTE; y over IP Multimedia Subsysteaspects of multi-stream multipimedia Telephony Service for .980 version 13.0.0 Release 1316-01) (U
2、MTS); stem (IMS); ltiparty or IMS (MTSI) 13) ETSI ETSI TR 126 980 V13.0.0 (2016-01)13GPP TR 26.980 version 13.0.0 Release 13Reference DTR/TSGS-0426980vd00 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
3、623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The conten
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7、ding photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards I
8、nstitute 2016. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its 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
9、 Marks registered and owned by the GSM Association. ETSI ETSI TR 126 980 V13.0.0 (2016-01)23GPP TR 26.980 version 13.0.0 Release 13Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essentia
10、l 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 ar
11、e available on the ETSI Web server (https:/ipr.etsi.org/). 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) wh
12、ich are, or may be, or may become, essential to the present document. Foreword This Technical Report (TR) 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 ide
13、ntities. 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 http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “should“,
14、 “should not“, “may“, “need not“, “will“, “will not“, “can“ 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 E
15、TSI TR 126 980 V13.0.0 (2016-01)33GPP TR 26.980 version 13.0.0 Release 13Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 8g33.1 Definitions 8g33.2 Abbreviations . 8g34 Overvie
16、w 9g35 Media Handling in Current 3GPP Conferencing 9g36 Use cases 10g36.1 Overview 10g36.2 Use case A: Transcoding Free Continuous Presence 10g36.2.1 Problem Description . 11g36.2.2 Proposed Solution . 12g36.3 Use case B: Screen Sharing 13g36.3.1 Problem Description . 13g36.3.2 Proposed Solution . 1
17、3g36.4 Use Case C: Bandwidth Handling 15g36.4.1 Problem Description . 15g36.4.2 Proposed Solution . 16g36.4.2.1 Single-stream to multi-stream . 16g36.4.2.2 Multi-stream to single-stream . 16g36.4.2.3 Multi-stream to multi-stream without bandwidth restriction 17g36.4.2.4 Multi-stream to multi-stream
18、with minor bandwidth restrictions 18g36.4.2.5 Multi-stream to multi-stream with severe bandwidth restriction 18g36.4.2.6 Multi-stream UE to multi-stream UE in point-to-point . 19g36.5 Use Case D: Active Speaker Override . 19g36.5.1 Problem Description . 20g36.5.2 Proposed Solution . 20g36.6 Use Case
19、 E: Pausing Unused Streams 22g36.6.1 Problem Description . 23g36.6.2 Proposed Solution . 24g36.7 Use Case F: Conference Rate Adaptation Considerations 25g36.7.1 Problem Description . 25g36.7.2 Proposed Solution . 25g36.8 Use Case G: Multi-stream Audio Steering or Panning . 27g36.9 Use Case H: De-jit
20、ter Buffer Handling 28g36.10 Use Case I: Audio Spatialization based on head-tracking 29g36.11 Use Case J: Mixing at the Rendering Device Media Handling, Distribution via Multi-Unicast . 30g36.11.1 Concurrent Codec Capabilities Exchange . 31g36.11.1.1 Concurrent Decoding 31g36.11.1.2 Concurrent Encod
21、ing 31g36.11.1.3 Further Considerations in Concurrency 32g36.11.1.4 Prioritizing and Ignoring of Received Media Streams 33g36.11.1.5 Conclusions . 33g36.12 Use Case K: Mixing at the Rendering Device Media Handling, Distribution via Multicast . 33g36.12.1 Session Establishment. 34g36.12.1.1 In the pr
22、esence of a Conference Focus 34g3ETSI ETSI TR 126 980 V13.0.0 (2016-01)43GPP TR 26.980 version 13.0.0 Release 136.12.2 Media Handling 34g36.12.2.1 In the absence of a Conference Focus for media handling 34g36.13 Use Case L: Mixing at the Rendering Device Media Handling, Distribution via Single Sourc
23、e Multi-Unicast 35g36.13.1 Session Establishment. 36g36.13.2 Media Handling 36g36.14 Use Case M: Provisioning of Talker ID . 37g36.14.1 Use Case Description 37g36.14.2 Problem Description . 37g36.14.3 Suggested Solution . 38g36.15 Use Case N: Mixing at the Rendering Device Media Handling, Concurrent
24、 Codec Capabilities Exchange 39g36.15.1 Format of the Concurrent Codec Capabilities Information . 39g36.15.1.1 Using Current SDP Parameters . 39g36.15.1.2 Using Compact SDP Parameters . 40g36.15.2 Protocol for Concurrent Codec Capabilities Exchange (CCCEx). 40g36.15.2.1 Requirements for the CCCEx 40
25、g36.15.2.2 Potential Solution for the CCCEx . 40g36.15.3 Examples of Concurrent Codec Capabilities (CCC) Usage 41g36.16 Use Case O: Media Distribution Without Conference Focus Session Establishment Aspects 46g36.16.1 Session Establishment Without a Conference Focus in Multi-unicast Topology . 46g37
26、Conclusion 47g3Annex A: SDP examples for Multi-stream Multiparty Conference Media Handling . 48g3A.1 General . 48g3A.2 MSMTSI video offer/answer examples 48g3A.2.1 MSMTSI offer/answer towards an MTSI client . 48g3A.2.2 MSMTSI answer from an MSMTSI MRF . 50g3A.2.3 MSMTSI answer from an MSMTSI client
27、in terminal. 53g3A.3 MSMTSI audio offer/answer examples 54g3A.3.1 MSMTSI offer with multi-stream audio support 54g3A.3.2 MSMTSI answer with multi-stream audio support 55g3A.3.3 MSMTSI CCCEx SDP offer/answer example . 56g3Annex B: Change history 61g3History 62g3ETSI ETSI TR 126 980 V13.0.0 (2016-01)5
28、3GPP TR 26.980 version 13.0.0 Release 13Foreword This Technical Report has been produced by the 3rdGeneration 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 content
29、s 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 docum
30、ent 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. Introduction Media handling of Multimedia Telephony S
31、ervice over IMS, MTSI, are based on 3GPP SA4 TS 26.114 1. MTSI media handling is referred to by GSMA in GSMA PRD IR.92 21 also known as VoLTE and GSMA PRD IR.94 22 also known as video over LTE. MTSI clients can connect to conferencing IMS communication services. 3GPP conducted a study as part of a w
32、ork item on Multi-stream Multiparty Conferencing Media-Handling for MTSI. The work objective is to specify an increment to MTSI client media-handling specification TS 26.114 to enable a mass-market multiparty communication service with excellent multiparty user experience and media quality. Such Ope
33、rator communication service evolution would match proprietary communication services in quality with excellent efficiency and device reach. The present document captures the study inputs, discussions and findings of the Multi-stream Multiparty Conference Media Handling (MMCMH) work item. It describe
34、s a set of use cases with corresponding problem descriptions and potential solutions. The conclusion gives recommendations as to what needs to be normatively specified to achieve the MMCMH work item objectives. ETSI ETSI TR 126 980 V13.0.0 (2016-01)63GPP TR 26.980 version 13.0.0 Release 131 Scope Th
35、e Technical Report provides a study on the media handling aspects of Multi-stream Multiparty Conferencing for MTSI. The study focuses on enabling - support to receive multi-stream audio/video at the terminals in a multiparty conferencing, - support for at least two video contents, e.g. one main and
36、one presentation, - talker ID provisioning, - compatibility with MTSI TS 26.114 and GSMA IR.94 (Video over LTE) 22 and GSMA IR.92 (VoLTE) 21, and - applicability to both mobile and fixed access terminals High-level use cases along with current limitations and recommendations are documented in the pr
37、esent document. 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 r
38、eference, 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 docu
39、ment. 1 3GPP TS 26.114 (V12.9.0): “IP Multimedia Subsystem (IMS); Multimedia Telephony, Media handling and interaction“. 2 S4-150097: “Updated New Work Item Description on MTSI Extension on Multi-stream Multiparty Conferencing Media Handling“. 3 3GPP TS 24.147: “Conferencing Using IP Multimedia Core
40、 Network; Stage 3“. 4 3GPP TS 24.605: “CONF Using IP Multimedia Core Network“. 5 3GPP TS 22.228: “Service Requirements for IP Multimedia Core Network; Stage 1“. 6 3GPP TS 23.218:“IP Multimedia Session Handling; IP Multimedia Call Model; Stage 2“. 7 3GPP TS 24.228: “Signalling Flows for IP Multimedia
41、 Call Control Based on SIP and SDP; Stage 3“. 8 3GPP TS 24.229: “IP Multimedia Call Control Protocol Based on SIP and SDP; Stage 3“. 9 3GPP TR 22.948: “IP Multimedia Subsystem Convergent Multimedia Conferencing“. 10 3GPP TR 29.847: “SIP Conferencing Models, Flows and Protocols“. 11 GSM Association:
42、“WebRTC Codecs DRAFT v1.3“, September 2014, http:/ 12 IETF Internet Draft: “Using Simulcast in SDP and RTP Sessions“, January 2015, https:/datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-simulcast/ . 13 IETF RFC 4796: “The Session Description Protocol (SDP) Content Attribute“, February 2007, https:/d
43、atatracker.ietf.org/doc/rfc4796/. ETSI ETSI TR 126 980 V13.0.0 (2016-01)73GPP TR 26.980 version 13.0.0 Release 1314 GSM Association PRD IR.39: “IMS Profile for High Definition Video Conferencing (HDVC) v5.0“, July 2014, http:/ 15 IETF RFC 4582: “The Binary Floor Control Protocol (BFCP)“, November 20
44、06, https:/datatracker.ietf.org/doc/rfc4582/. NOTE A new version of this RFC is in the process of being published. See 17. 16 IETF RFC 4583: “Session Description Protocol (SDP) Format for Binary Floor Control Protocol (BFCP) Streams“, November 2006, https:/datatracker.ietf.org/doc/rfc4583/. NOTE: A
45、new version of this RFC is in the process of being published. See 18. 17 draft-ietf-bfcpbis-rfc4582bis-13: “The Binary Floor Control Protocol (BFCP), February 2015, WORK IN PROGRESS, https:/datatracker.ietf.org/doc/draft-ietf-bfcpbis-rfc4582bis/. 18 draft-ietf-bfcpbis-rfc4583bis-11: “Session Descrip
46、tion Protocol (SDP) Format for Binary Floor Control Protocol (BFCP) Streams“, February 2015, WORK IN PROGRESS, https:/datatracker.ietf.org/doc/draft-ietf-bfcpbis-rfc4583bis/. 19 IETF RFC 3550: “RTP: A Transport Protocol for Real-Time Applications“, July 2003, https:/datatracker.ietf.org/doc/rfc3550/
47、. 20 IETF RFC 5104: “Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF)“, February 2008, https:/datatracker.ietf.org/doc/rfc5104/. 21 GSM Association PRD IR.92, “IR.92 IMS Profile for Voice and SMS“, v9.0, April 2015, http:/ 22 GSM Association PRD IR.94: “IR.94 IMS Profile f
48、or Conversational Video Service“, v8.0.1, November 2014, http:/ 23 Internet Draft, “RTP Stream Pause and Resume“, March 2015, https:/datatracker.ietf.org/doc/draft-ietf-avtext-rtp-stream-pause/ (submitted to IESG for publication). 24 3GPP TS 24.173: “IMS Multimedia Telephony Communication Service and Supplementary Services“. 25 IETF RFC 4353: “A Framework for Conferencing with the Session Initiation Protocol (SIP)“, February 2006, https:/datatracker.ietf.org/doc/rfc4353/. 26 IETF RFC 3515: “The Session Initiation Protocol (SIP) Refer Method“, Apri
