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TR 26.980 (SA4) ★
Media Handling aspects
of Multi-Stream Multiparty Conferencing
for MTSI

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V15.0.0 (PDF)  2018/06  86 p.
V14.2.0  2017/03  88 p.
V13.0.0  2015/12  63 p.

Rapporteur:  Mr. Leung, Nikolai
See also:
MMTel-related TS/TR
This TR 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 one presentation,
  • talker ID provisioning,
  • compatibility with MTSI TS 26.114 and GSMA IR.94 (Video over LTE) and GSMA IR.92 (VoLTE), and
  • applicability to both mobile and fixed access terminals.
High-level use cases along with current limitations and recommendations are documented in the present document.

full Table of Contents for  TR 26.980  Word version:   15.0.0

 

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1  Scope [R13]  Word-p. 7
2  References [R13]
3  Definitions and abbreviations [R13]  Word-p. 9
3.1  Definitions
3.2  Abbreviations  Word-p. 10
4  Overview [R13]
5  Media Handling in Current 3GPP Conferencing [R13]
6  Use cases [R13]  Word-p. 12
6.1  Overview
6.2  Use case A: Transcoding Free Continuous Presence
6.2.1  Problem Description  Word-p. 13
6.2.2  Proposed Solution
6.3  Use case B: Screen Sharing  Word-p. 14
6.3.1  Problem Description
6.3.2  Proposed Solution  Word-p. 15
6.4  Use Case C: Bandwidth Handling  Word-p. 17
6.4.1  Problem Description
6.4.2  Proposed Solution
6.4.2.1  Single-stream to multi-stream  Word-p. 18
6.4.2.2  Multi-stream to single-stream
6.4.2.3  Multi-stream to multi-stream without bandwidth restriction  Up
6.4.2.4  Multi-stream to multi-stream with minor bandwidth restrictions  Word-p. 19
6.4.2.5  Multi-stream to multi-stream with severe bandwidth restriction  Word-p. 20
6.4.2.6  Multi-stream UE to multi-stream UE in point-to-point
6.5  Use Case D: Active Speaker Override  Word-p. 21
6.5.1  Problem Description
6.5.2  Proposed Solution  Word-p. 22
6.6  Use Case E: Pausing Unused Streams  Word-p. 23
6.6.1  Problem Description  Word-p. 24
6.6.2  Proposed Solution  Word-p. 25
6.7  Use Case F: Conference Rate Adaptation Considerations  Word-p. 26
6.7.1  Problem Description
6.7.2  Proposed Solution
6.8  Use Case G: Multi-stream Audio Steering or Panning  Word-p. 29
6.9  Use Case H: De-jitter Buffer Handling  Word-p. 30
6.10  Use Case I: Audio Spatialization based on head-tracking  Word-p. 31
6.11  Use Case J: Mixing at the Rendering Device - Media Handling, Distribution via Multi-Unicast  Word-p. 32
6.11.1  Concurrent Codec Capabilities Exchange
6.11.1.1  Concurrent Decoding
6.11.1.2  Concurrent Encoding  Word-p. 33
6.11.1.3  Further Considerations in Concurrency  Word-p. 34
6.11.1.4  Prioritizing and Ignoring of Received Media Streams
6.11.1.5  Conclusions
6.12  Use Case K: Mixing at the Rendering Device - Media Handling, Distribution via Multicast  Word-p. 35
6.12.1  Session Establishment
6.12.1.1  In the presence of a Conference Focus
6.12.2  Media Handling
6.12.2.1  In the absence of a Conference Focus for media handling
6.13  Use Case L: Mixing at the Rendering Device - Media Handling, Distribution via Single Source Multi-Unicast  Word-p. 36
6.13.1  Session Establishment  Word-p. 38
6.13.2  Media Handling  Up
6.13.3  Multi-stream Concurrent Encoding/Decoding Capabilities [R14]
6.13.3.1  Querying and Capabilities Exchange - SIP OPTIONS  Word-p. 39
6.13.3.2  Common/Preferred Codec Identification and Usage  Word-p. 42
6.13.3.2.1  General
6.13.3.2.2  Common/Preferred Codec Information Exchange
6.13.3.2.3  Indicating the Common and Preferred Codec Selection Through SDP  Word-p. 43
6.13.4  MSMTSI MRF Handling with Reduced m-lines [R14]
6.13.4.1  Introduction
6.13.4.2  RTP Stream Selective Forwarding
6.14  Use Case M: Provisioning of Talker ID  Word-p. 45
6.14.1  Use Case Description
6.14.2  Problem Description
6.14.3  Suggested Solution  Word-p. 46
6.15  Use Case N: Mixing at the Rendering Device - Media Handling, Concurrent Codec Capabilities Exchange  Word-p. 47
6.15.1  Format of the Concurrent Codec Capabilities Information
6.15.1.1  Using Current SDP Parameters
6.15.1.2  Using Compact SDP Parameters  Word-p. 48
6.15.1.2.1  SDP Line Compression [R14]  Word-p. 49
6.15.1.2.2  SDP Line Compression for Terminal Performing Trimming of Streams [R14]  Word-p. 51
6.15.1.2.3  Conclusions [R14]  Up
6.15.2  Protocol for Concurrent Codec Capabilities Exchange (CCCEx)
6.15.2.1  Recommended Requirements for the CCCEx
6.15.2.2  Potential Solution for the CCCEx
6.15.3  Examples of Concurrent Codec Capabilities (CCC) Usage
6.15.4  Compact CCC SDP Parameter for Session Initiation [R14]  Word-p. 56
6.15.4.1  Introduction
6.15.4.2  Compression Gains
6.15.4.3  Offer-Answer Rules  Word-p. 58
6.15.4.4  Conclusions  Word-p. 59
6.16  Use Case O: Media Distribution Without Conference Focus - Session Establishment Aspects  Up
6.16.1  Session Establishment Without a Conference Focus in Multi-unicast Topology
6.17  Use Case P: Codec Migration [R14]  Word-p. 60
6.17.1  General
6.17.2  Problem Description
6.17.3  Proposed Solution  Word-p. 61
6.17.3.1  General
6.17.3.2  Codec Fall-back
6.17.3.3  Transcoding
6.17.3.4  Codec Simulcast  Word-p. 62
6.17.3.5  Recommended Requirements for Codec Simulcast  Word-p. 63
7  Conclusion [R13]  Word-p. 64
A  SDP examples for Multi-stream Multiparty Conference Media Handling [R13]  Word-p. 65
A.1  General
A.2  MSMTSI video offer/answer examples
A.2.1  MSMTSI offer/answer towards an MTSI client
A.2.2  MSMTSI answer from an MSMTSI MRF  Word-p. 67
A.2.3  MSMTSI answer from an MSMTSI client in terminal  Word-p. 70
A.2.4  MSMTSI Offer and Answer Using Codec Simulcast [R14]  Word-p. 71
A.3  MSMTSI audio offer/answer examples  Word-p. 73
A.3.1  MSMTSI offer with multi-stream audio support  Up
A.3.2  MSMTSI answer with multi-stream audio support  Word-p. 74
A.3.3  MSMTSI CCCEx SDP offer/answer example  Word-p. 76
B  QoS for Multi-stream Multiparty Conference Media Handling [R14]  Word-p. 80
B.1  General
B.2  QoS for MSMTSI video offer/answer examples
C  Technical Background [R14]  Word-p. 81
C.1  General
C.2  Simulcast Stream Identification
C.2.1  General
C.2.2  Codec Identification in SDP  Up
C.2.3  Sampling Identification in SDP  Word-p. 82
C.2.4  Bandwidth Identification in SDP
C.2.5  Simulcast Usage for WebRTC
C.2.5.1  General
C.2.5.2  RTP Payload Type Uniqueness
C.2.5.3  RTP Payload Type Depletion  Word-p. 83
C.2.6  Conclusion
D  Change history  Word-p. 84

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