Sending Multiple RTP Streams in a Single RTP Session: Grouping RTCP Reception Statistics and Other Feedback
draft-ietf-avtcore-rtp-multi-stream-optimisation-12

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AVTCORE WG                                                     J. Lennox
Internet-Draft                                                     Vidyo
Intended status: Standards Track                           M. Westerlund
Expires: September 3, 2016                                      Ericsson
                                                                   Q. Wu
                                                                  Huawei
                                                              C. Perkins
                                                   University of Glasgow
                                                           March 2, 2016

  Sending Multiple RTP Streams in a Single RTP Session: Grouping RTCP
                Reception Statistics and Other Feedback
          draft-ietf-avtcore-rtp-multi-stream-optimisation-12

Abstract

   RTP allows multiple RTP streams to be sent in a single session, but
   requires each Synchronisation Source (SSRC) to send RTCP reception
   quality reports for every other SSRC visible in the session.  This
   causes the number of RTCP reception reports to grow with the number
   of SSRCs, rather than the number of endpoints.  In many cases most of
   these RTCP reception reports are unnecessary, since all SSRCs of an
   endpoint are normally co-located and see the same reception quality.
   This memo defines a Reporting Group extension to RTCP to reduce the
   reporting overhead in such scenarios.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on September 3, 2016.

Lennox, et al.          Expires September 3, 2016               [Page 1]
Internet-Draft     Grouping RTCP Reception Statistics         March 2016

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  RTCP Reporting Groups . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Semantics and Behaviour of RTCP Reporting Groups  . . . .   4
     3.2.  Identifying Members of an RTCP Reporting Group  . . . . .   5
       3.2.1.  Definition and Use of the RTCP RGRP SDES Item . . . .   5
       3.2.2.  Definition and Use of the RTCP RGRS Packet  . . . . .   6
     3.3.  Interactions with the RTP/AVPF Feedback Profile . . . . .   8
     3.4.  Interactions with RTCP Extended Report (XR) Packets . . .   9
     3.5.  Middlebox Considerations  . . . . . . . . . . . . . . . .   9
     3.6.  SDP Signalling for Reporting Groups . . . . . . . . . . .  10
   4.  Properties of RTCP Reporting Groups . . . . . . . . . . . . .  12
     4.1.  Bandwidth Benefits of RTCP Reporting Groups . . . . . . .  12
     4.2.  Compatibility of RTCP Reporting Groups  . . . . . . . . .  13
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   The Real-time Transport Protocol (RTP) [RFC3550] is a protocol for
   group communication, supporting multiparty multimedia sessions.  A
   single RTP session can support multiple participants sending at once,
   and can also support participants sending multiple simultaneous RTP
   streams.  Examples of the latter might include a participant with
   multiple cameras who chooses to send multiple views of a scene, or a
   participant that sends audio and video flows multiplexed in a single