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TR 26.980 (SA4)
Media handling aspects of multi-stream multiparty conferencing for MTSI

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V14.2.0 (PDF)  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.


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1  ScopePDF-p. 7
2  References
3  Definitions and abbreviationsPDF-p. 9
4  Overview
5  Media Handling in Current 3GPP Conferencing
6  Use casesPDF-p. 12
6.1  Overview
6.2  Use case A: Transcoding Free Continuous Presence
6.3  Use case B: Screen SharingPDF-p. 14
6.4  Use Case C: Bandwidth HandlingPDF-p. 17
6.5  Use Case D: Active Speaker OverridePDF-p. 21
6.6  Use Case E: Pausing Unused StreamsPDF-p. 23
6.7  Use Case F: Conference Rate Adaptation ConsiderationsPDF-p. 26Up
6.8  Use Case G: Multi-stream Audio Steering or PanningPDF-p. 29
6.9  Use Case H: De-jitter Buffer HandlingPDF-p. 30
6.10  Use Case I: Audio Spatialization based on head-trackingPDF-p. 31
6.11  Use Case J: Mixing at the Rendering Device - Media Handling, Distribution via Multi-UnicastPDF-p. 32

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