Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions
draft-ietf-avtcore-rtp-circuit-breakers-15

Document Type Active Internet-Draft (avtcore WG)
Last updated 2016-05-05 (latest revision 2016-04-30)
Replaces draft-perkins-avtcore-rtp-circuit-breakers
Stream IETF
Intended RFC status Proposed Standard
Formats plain text pdf html bibtex
Stream WG state Submitted to IESG for Publication Dec 2015
Document shepherd Magnus Westerlund
Shepherd write-up Show (last changed 2016-02-17)
IESG IESG state IESG Evaluation::Revised I-D Needed
Consensus Yes
Telechat date On agenda of 2016-05-05 IESG telechat
Has 2 DISCUSSes. Has enough positions to pass once DISCUSS positions are resolved.
Responsible AD Ben Campbell
Send notices to (None)
IANA IANA review state IANA OK - No Actions Needed
IANA action state None
AVTCORE Working Group                                         C. Perkins
Internet-Draft                                     University of Glasgow
Updates: 3550 (if approved)                                     V. Singh
Intended status: Standards Track                            callstats.io
Expires: November 1, 2016                                 April 30, 2016

Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions
               draft-ietf-avtcore-rtp-circuit-breakers-15

Abstract

   The Real-time Transport Protocol (RTP) is widely used in telephony,
   video conferencing, and telepresence applications.  Such applications
   are often run on best-effort UDP/IP networks.  If congestion control
   is not implemented in these applications, then network congestion can
   lead to uncontrolled packet loss, and a resulting deterioration of
   the user's multimedia experience.  The congestion control algorithm
   acts as a safety measure, stopping RTP flows from using excessive
   resources, and protecting the network from overload.  At the time of
   this writing, however, while there are several proprietary solutions,
   there is no standard algorithm for congestion control of interactive
   RTP flows.

   This document does not propose a congestion control algorithm.  It
   instead defines a minimal set of RTP circuit breakers: conditions
   under which an RTP sender needs to stop transmitting media data, to
   protect the network from excessive congestion.  It is expected that,
   in the absence of long-lived excessive congestion, RTP applications
   running on best-effort IP networks will be able to operate without
   triggering these circuit breakers.  Future RTP congestion control
   specifications will be expected to operate within the constraints
   defined by these circuit breakers.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Perkins & Singh         Expires November 1, 2016                [Page 1]
Internet-Draft            RTP Circuit Breakers                April 2016

   This Internet-Draft will expire on November 1, 2016.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  RTP Circuit Breakers for Systems Using the RTP/AVP Profile  .   7
     4.1.  RTP/AVP Circuit Breaker #1: RTCP Timeout  . . . . . . . .   9
     4.2.  RTP/AVP Circuit Breaker #2: Media Timeout . . . . . . . .  10
     4.3.  RTP/AVP Circuit Breaker #3: Congestion  . . . . . . . . .  12
     4.4.  RTP/AVP Circuit Breaker #4: Media Usability . . . . . . .  15
     4.5.  Ceasing Transmission  . . . . . . . . . . . . . . . . . .  16
   5.  RTP Circuit Breakers and the RTP/AVPF and RTP/SAVPF Profiles   17
   6.  Impact of RTCP Extended Reports (XR)  . . . . . . . . . . . .  18
   7.  Impact of Explicit Congestion Notification (ECN)  . . . . . .  19
   8.  Impact of Bundled Media and Layered Coding  . . . . . . . . .  19
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  20
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  20
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  21
     12.2.  Informative References . . . . . . . . . . . . . . . . .  21
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  24
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