1、 ETSI TR 126 923 V15.0.0 (2018-07) 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 15.0.0 Release 15) TECHNICAL REPORT ETSI
2、 ETSI TR 126 923 V15.0.0 (2018-07)13GPP TR 26.923 version 15.0.0 Release 15Reference RTR/TSGS-0426923vf00 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
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9、ned by the GSM Association. ETSI ETSI TR 126 923 V15.0.0 (2018-07)23GPP TR 26.923 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IP
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12、are, or may be, or may become, essential to the present document. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and con
13、veys no right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Report (TR) has been produced by ETSI 3rd
14、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,
15、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“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal f
16、orms 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 V15.0.0 (2018-07)33GPP TR 26.923 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3For
17、eword . 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 9g34.2 Service Aspects 9g34.2.1 Overview 9g34.2.2 Use Case . 10g34.2.3 Requirements from TS 22.228 1
18、1g34.3 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) 13g34.4.2.3 Media Resource Function Controller (MRFC) and Media Resource Function Processor (MFRP) 15g
19、34.4.2.4 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 CLUE 16g35.1.2 Media Handling Requirements for TP UE 17g35.1.2.1 Data Channel for CLUE Messages . 17g35
20、.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 GSMA IR.39 IMS Profile for High Definition Video Conference . 19g35.2.1 Introduction. 19g35.2.2 Screen
21、 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 Experience 21g35.3.1.2 Statistical Information Reporting 22g35.3.1.3 Network-Level Aspects . 22g35.3.2 Aud
22、io/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 parameters . 25g35.3.2.1.5 Multiple Source Capture parameters . 26g35.3.2.2 Telepresence System Environ
23、ment parameters . 26g3ETSI ETSI TR 126 923 V15.0.0 (2018-07)43GPP TR 26.923 version 15.0.0 Release 155.3.3 Gap Analysis . 26g35.4 MPEG Codecs Relevant for Telepresence . 27g35.4.1 MPEG-4 AAC-ELD . 27g35.4.1.1 Introduction . 27g35.4.1.2 Gap Analysis . 27g35.4.2 MPEG Video Codecs 27g35.4.2.1 Introduct
24、ion . 27g35.4.2.2 Gap Analysis . 27g36 Conclusion 27g36.1 Codecs 27g36.2 Media Handling Aspects 28g3Annex A: Change history 29g3History 30g3ETSI ETSI TR 126 923 V15.0.0 (2018-07)53GPP TR 26.923 version 15.0.0 Release 15Foreword The present document has been produced by the 3rdGeneration Partnership
25、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
26、 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, cor
27、rections, 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 telepresence were introduced by SA1 into TS 22.228 to enable telepresence support in IMS applications.
28、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 between all participants (i.e. as if they are in same location) by optimizing a variety of attributes s
29、uch 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 elements which are able to capture, deliver, manage and render multiple high quality interactive aud
30、io 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 telepresence. The core network aspects of IMS-based telepresence have been addressed by the CT groups
31、 (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/) that achieves media advertisement and configuration to facilitate controlling and negotiating mult
32、iple 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 sending system, receiving system, or intermediate system can make decisions about transmitting, select
33、ing, 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 for a telepresence UE (TP UE), which is expected to not only support Multimedia Telephony Service
34、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 transport, media adaptation, QoS handling and interworking with MTSI are also studied. ETSI ETSI TR 126 92
35、3 V15.0.0 (2018-07)63GPP TR 26.923 version 15.0.0 Release 151 Scope The present document provides a study on the media handling aspects of IMS-based telepresence in 3GPP services. This includes the investigation of the following areas: - Media codecs (speech, video, real-time text) for IMS-based tel
36、epresence. - 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. - Set-up and control of the individual media streams between clients including interactivity, suc
37、h 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 formats, RTP mapping, media synchronization, etc. for IMS-based telepresence, e.g. in relation to neg
38、otiation 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 in response to changes of network bandwidth. - Media handling requirements and guidelines for fixe
39、d-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 recommendations and conclusions for the proposed improvements are documented in the present document. Stu
40、dy 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 documents contain provisions which, through reference in this text, constitute provisions of the pr
41、esent 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 a reference to a 3GPP
42、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 3GPP Specifications“. 2 3GPP TS 26.114: “IP Multimedia Subsystem (IMS); Multimedia telephony; Media ha
43、ndling 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 protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3“. 5 3G
44、PP 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“. 7 3GPP TS 24.803: “Study on Telepresence using the IP Multimedia (IM) Core Network (CN) Subsystem
45、(IMS); Stage 3“. 8 draft-ietf-clue-framework-22 (April 2015): “Framework for Telepresence Multi-Streams“. 9 draft-ietf-clue-datachannel-09 (March 2015): “CLUE Protocol Data Channel“. ETSI ETSI TR 126 923 V15.0.0 (2018-07)73GPP TR 26.923 version 15.0.0 Release 1510 draft-ietf-clue-signaling-05 (March
46、 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 CLUE media captures“. 14 draft-ietf-mmusic-sctp-sdp-14 (March 2015): “Stream Control Transmission P
47、rotocol (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 Definition Video Conference (HDVC) Service“. 17 Recommendation ITU-T H.239 (10/2014): “Role management
48、 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-band audio coding for high-quality, conversational applications“. 20 ISO/IEC 14496-3:2009: “Inform
49、ation 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 Recommendation 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 Telepresence Systems“. 25 Recommend
