1、 ETSI TR 126 923 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Study on media handling aspects of IP Multimedia Subsystem (IMS) based telepresence (3GPP TR 26.923 version 14.0.0 Release 14) TECHNICAL REPORT ETSI
2、 ETSI TR 126 923 V14.0.0 (2017-04)13GPP TR 26.923 version 14.0.0 Release 14Reference RTR/TSGS-0426923ve00 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
3、 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 content of any electronic and/or print versions of
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9、GSM Association. ETSI ETSI TR 126 923 V14.0.0 (2017-04)23GPP TR 26.923 version 14.0.0 Release 14Intellectual 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 availab
10、le 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
11、(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) which are, or may be, or may become,
12、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 identities. These should be interprete
13、d 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 “should“, “should not“, “may“, “need not“, “will“, “will not“, “ca
14、n“ 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 TR 126 923 V14.0.0 (2017-04)33GPP TR 26.923 version 1
15、4.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 8g33.1 Definitions 8g33.2 Abbreviations . 9g34 Overview of IMS-based Telepresence in 3GPP . 9g34.1 Introduction
16、 9g34.2 Service Aspects 9g34.2.1 Overview 9g34.2.2 Use Case . 10g34.2.3 Requirements from TS 22.228 11g34.3 Core Network Aspects 11g34.4 Protocols and Architecture for IMS-based Telepresence . 12g34.4.1 Introduction. 12g34.4.2 Functional Entities 12g34.4.2.1 General 12g34.4.2.2 User Equipment (UE) 1
17、3g34.4.2.3 Media Resource Function Controller (MRFC) and Media Resource Function Processor (MFRP) 15g34.4.2.4 Conferencing Application Server (Conferencing AS) 15g35 Gap Analysis on Media Handling Aspects of IMS-based Telepresence 16g35.1 Media Handling Aspects of CLUE . 16g35.1.1 Introduction on CL
18、UE 16g35.1.2 Media Handling Requirements for TP UE 17g35.1.2.1 Data Channel for CLUE Messages . 17g35.1.2.2 RTP / RTCP Level Requirements . 17g35.1.3 Guidelines and Examples of SDP and CLUE for Telepresence . 18g35.1.4 Session Setup and Control Procedures for TP UE 19g35.1.5 Gap Analysis . 19g35.2 G
19、SMA IR.39 IMS Profile for High Definition Video Conference . 19g35.2.1 Introduction. 19g35.2.2 Screen Sharing 20g35.2.3 Voice Codecs 20g35.2.4 Video Codecs 21g35.2.5 Gap Analysis . 21g35.3 Media Handling Aspects of Telepresence from ITU-T SG16 21g35.3.1 Functional Requirements 21g35.3.1.1 User Exper
20、ience 21g35.3.1.2 Statistical Information Reporting 22g35.3.1.3 Network-Level Aspects . 22g35.3.2 Audio/Video Parameters. 22g35.3.2.0 General 22g35.3.2.1 Capture-Related Parameters 23g35.3.2.1.1 General parameters 23g35.3.2.1.2 Visual parameters 24g35.3.2.1.3 Audio parameters. 25g35.3.2.1.4 Delay pa
21、rameters . 26g35.3.2.1.5 Multiple Source Capture parameters . 26g3ETSI ETSI TR 126 923 V14.0.0 (2017-04)43GPP TR 26.923 version 14.0.0 Release 145.3.2.2 Telepresence System Environment parameters . 27g35.3.3 Gap Analysis . 27g35.4 MPEG Codecs Relevant for Telepresence . 27g35.4.1 MPEG-4 AAC-ELD . 27
22、g35.4.1.1 Introduction . 27g35.4.1.2 Gap Analysis 27g35.4.2 MPEG Video Codecs 28g35.4.2.1 Introduction . 28g35.4.2.2 Gap Analysis . 28g36 Conclusion 28g36.1 Codecs 28g36.2 Media Handling Aspects 28g3Annex A: Change history 30g3History 31g3ETSI ETSI TR 126 923 V14.0.0 (2017-04)53GPP TR 26.923 version
23、 14.0.0 Release 14Foreword The present document 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 contents of the present docume
24、nt, 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 contro
25、l. 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 During Release 12, use cases and requirements on IMS-based tele
26、presence were introduced by SA1 into TS 22.228 to enable telepresence support in IMS applications. In TS 22.228, telepresence is defined as a conference with interactive audio-visual communications experience between remote locations, where the users enjoy a strong sense of realism and presence betw
27、een all participants (i.e. as if they are in same location) by optimizing a variety of attributes such as audio and video quality, eye contact, body language, spatial audio, coordinated environments and natural image size. A telepresence system is defined as a set of functions, devices and network e
28、lements which are able to capture, deliver, manage and render multiple high quality interactive audio and video signals in a telepresence conference. An appropriate number of devices (e.g. cameras, screens, loudspeakers, microphones, codecs) and environmental characteristics are used to establish te
29、lepresence. The core network aspects of IMS-based telepresence have been addressed by the CT groups (CT1, CT3, CT4), including incorporation of new tools into IMS as defined by IETFs ControLling mUltiple streams for tElepresence (CLUE) WG (see more from: https:/datatracker.ietf.org/wg/clue/charter/)
30、 that achieves media advertisement and configuration to facilitate controlling and negotiating multiple spatially related media streams in an IMS conference supporting telepresence, taking into account capability information, e.g. screen size, number of screens and cameras, codecs, etc., so that sen
31、ding system, receiving system, or intermediate system can make decisions about transmitting, selecting, and rendering media streams. This present document provides a study of media handling aspects of IMS-based telepresence in 3GPP services. This includes identification of codec-level technical gaps
32、 for a telepresence UE (TP UE), which is expected to not only support Multimedia Telephony Service for IMS (MTSI) UE media handling capabilities 2, but also more advanced media handling capabilities. Other SA4-level media handling aspects such as media configuration and session control, data transpo
33、rt, media adaptation, QoS handling and interworking with MTSI are also studied. ETSI ETSI TR 126 923 V14.0.0 (2017-04)63GPP TR 26.923 version 14.0.0 Release 141 Scope The present document provides a study on the media handling aspects of IMS-based telepresence in 3GPP services. This includes the inv
34、estigation of the following areas: - Media codecs (speech, video, real-time text) for IMS-based telepresence. - Media configuration including session setup and control procedures for IMS-based telepresence, and media provisioning aspects of capability negotiation based on SDP and CLUE protocols, etc
35、. - Set-up and control of the individual media streams between clients including interactivity, such as adding and dropping of media components, as well as end-to-end QoS handling, etc. for IMS-based telepresence. - Data transport including usage of RTP / RTCP protocols, RTP profiles, RTP payload fo
36、rmats, RTP mapping, media synchronization, etc. for IMS-based telepresence, e.g. in relation to negotiation and establishment of the CLUE data channel, and exchange of CLUE ADVERTISEMENT and CONFIGURE messages. - Requirements and guidelines for media adaptation in IMS-based telepresence, for example
37、 in response to changes of network bandwidth. - Media handling requirements and guidelines for fixed-mobile interworking as well as interworking with MTSI and with GSMAs IMS profile on High-Definition Video Conference (HDVC) service in IR.39. The gap analysis of the above areas and associated recomm
38、endations and conclusions for the proposed improvements are documented in the present document. Study and evaluation of end-to-end quality of experience (QoE) for IMS-based telepresence use cases for various codec, media handling and QoS configurations are also presented. 2 References The following
39、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
40、. - 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 3GPP TR 21.905: “Vocabulary for 3GP
41、P Specifications“. 2 3GPP TS 26.114: “IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and interaction“. 3 3GPP TS 22.228: “Service requirements for the Internet Protocol (IP) multimedia core network subsystem (IMS); Stage 1“. 4 3GPP TS 24.229: “IP multimedia scall control protoco
42、l based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3“. 5 3GPP TS 24.147: “Conferencing using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3“. 6 3GPP TS 24.103: “Telepresence using the IP Multimedia (IM) Core Network (CN) Subsystem (IMS); Stage 3“.
43、 7 3GPP TS 24.803: “Study on Telepresence using the IP Multimedia (IM) Core Network (CN) Subsystem (IMS); Stage 3“. 8 draft-ietf-clue-framework-22 (April 2015): “Framework for Telepresence Multi-Streams“. ETSI ETSI TR 126 923 V14.0.0 (2017-04)73GPP TR 26.923 version 14.0.0 Release 149 draft-ietf-clu
44、e-datachannel-09 (March 2015): “CLUE Protocol Data Channel“. 10 draft-ietf-clue-signaling-05 (March 2015): “CLUE Signaling“. 11 draft-ietf-clue-data-model-schema-10 (June 2015): “An XML Schema for the CLUE data model“. 12 void. 13 draft-ietf-clue-rtp-mapping-04 (March 2015): “Mapping RTP streams to
45、CLUE media captures“. 14 draft-ietf-mmusic-sctp-sdp-14 (March 2015): “Stream Control Transmission Protocol (SCTP) Based Media Transport in the Session Description Protocol (SDP)“. 15 IETF RFC 4574: “The Session Description Protocol (SDP) Label Attribute“. 16 GSMA PRD IR.39: “IMS Profile for High Def
46、inition Video Conference (HDVC) Service“. 17 Recommendation ITU-T H.239 (10/2014): “Role management and additional media channels for H.300-series terminals “. 18 IETF RFC 4796: “The Session Description Protocol (SDP) Content Attribute“. 19 Recommendation ITU-T G.719 (06/2008): “Low-complexity, full
47、-band audio coding for high-quality, conversational applications“. 20 ISO/IEC 14496-3:2009: “Information technology - Coding of audio-visual objects. Part 3: Audio“. 21 IETF RFC 5404: “RTP Payload Format for G.719“. 22 IETF RFC 3016: “RTP Payload Format for MPEG-4 Audio/Visual Streams“. 23 Recommend
48、ation ITU-T H.264 (02/2014): “Advanced video coding for generic audio-visual services“ | ISO/IEC 14496-10:2005: “Information technology - Coding of audio-visual objects - Part 10: Advanced Video Coding“. 24 Recommendation ITU-T F.734 (10/2014): “Definitions, requirements, and use cases for Teleprese
49、nce Systems“. 25 Recommendation ITU G.1091 (10/2014): “Quality of Experience requirements for telepresence services“. 26 IETF RFC 3264 (2002): “An Offer/Answer Model with the Session Description Protocol (SDP)“, J. Rosenberg and H. Schulzrinne. 27 draft-ietf-tsvwg-sctp-dtls-encaps-09 (January 2015): “DTLS Encapsulation of SCTP Packets“. 28 draft-ietf-mmusic-sdp-bundle-negotiation-23 (July 2015): “Negotiating Media Multiplexing Using the Session Description Protocol (SDP)“. 29 Recommendation ITU-T H.TPS-AV (02/201
