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Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions
draft-ietf-avtcore-rtp-circuit-breakers-05

Document type: Active Internet-Draft (avtcore WG)
Document stream: IETF
Last updated: 2014-02-14
Intended RFC status: Unknown
Other versions: plain text, pdf, html

IETF State: WG Document Nov 2013
Consensus: Unknown
Document shepherd: Magnus Westerlund

IESG State: I-D Exists
Responsible AD: (None)
Send notices to: No addresses provided

AVTCORE Working Group                                      C. S. Perkins
Internet-Draft                                     University of Glasgow
Updates: 3550 (if approved)                                     V. Singh
Intended status: Standards Track                        Aalto University
Expires: August 18, 2014                               February 14, 2014

Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions
               draft-ietf-avtcore-rtp-circuit-breakers-05

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 the applications, then network congestion will
   deteriorate the user's multimedia experience.  This document does not
   propose a congestion control algorithm; instead, it defines a minimal
   set of RTP "circuit-breakers".  Circuit-breakers are conditions under
   which an RTP sender needs to stop transmitting media data in order to
   protect the network from excessive congestion.  It is expected that,
   in the absence of severe congestion, all RTP applications running on
   best-effort IP networks will be able to run without triggering these
   circuit breakers.  Any future RTP congestion control specification
   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."

   This Internet-Draft will expire on August 18, 2014.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Perkins & Singh         Expires August 18, 2014                 [Page 1]
Internet-Draft            RTP Circuit Breakers             February 2014

   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
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  RTP Circuit Breakers for Systems Using the RTP/AVP Profile  .   6
     4.1.  RTP/AVP Circuit Breaker #1: Media Timeout . . . . . . . .   7
     4.2.  RTP/AVP Circuit Breaker #2: RTCP Timeout  . . . . . . . .   8
     4.3.  RTP/AVP Circuit Breaker #3: Congestion  . . . . . . . . .   9
     4.4.  RTP/AVP Circuit Breaker #4: Media Usability . . . . . . .  12
     4.5.  Ceasing Transmission  . . . . . . . . . . . . . . . . . .  13
   5.  RTP Circuit Breakers for Systems Using the RTP/AVPF Profile .  13
   6.  Impact of RTCP XR . . . . . . . . . . . . . . . . . . . . . .  14
   7.  Impact of RTCP Reporting Groups . . . . . . . . . . . . . . .  15
   8.  Impact of Explicit Congestion Notification (ECN)  . . . . . .  15
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  16
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  16
     12.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   The Real-time Transport Protocol (RTP) [RFC3550] is widely used in
   voice-over-IP, video teleconferencing, and telepresence systems.
   Many of these systems run over best-effort UDP/IP networks, and can
   suffer from packet loss and increased latency if network congestion

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