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Explicit Congestion Notification (ECN) for RTP over UDP (RFC6679) Disclosure Number: IPCOM000220525D
Original Publication Date: 2012-Aug-01
Included in the Prior Art Database: 2012-Aug-03

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Westerlund: AUTHOR [+5]


This memo outlines how Explicit Congestion Notification (ECN) [RFC3168] can be used for Real-time Transport Protocol (RTP) [RFC3550] flows running over UDP/IP that use the RTP Control Protocol (RTCP) as a feedback mechanism. The solution consists of feedback of ECN congestion experienced markings to the sender using RTCP, verification of ECN functionality end-to-end, and procedures for how to initiate ECN usage. Since the initiation process has some dependencies on the signalling mechanism used to establish the RTP session, a specification for signalling mechanisms using the Session Description Protocol (SDP) [RFC4566] is included.

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Internet Engineering Task Force (IETF)                     M. Westerlund Request for Comments: 6679                                  I. Johansson Category: Standards Track                                       Ericsson ISSN: 2070-1721                                               C. Perkins                                                    University of Glasgow                                                              P. O'Hanlon                                                     University of Oxford                                                              K. Carlberg                                                                      G11                                                              August 2012

         Explicit Congestion Notification (ECN) for RTP over UDP


   This memo specifies how Explicit Congestion Notification (ECN) can be    used with the Real-time Transport Protocol (RTP) running over UDP,    using the RTP Control Protocol (RTCP) as a feedback mechanism.  It    defines a new RTCP Extended Report (XR) block for periodic ECN    feedback, a new RTCP transport feedback message for timely reporting    of congestion events, and a Session Traversal Utilities for NAT    (STUN) extension used in the optional initialisation method using    Interactive Connectivity Establishment (ICE).  Signalling and    procedures for negotiation of capabilities and initialisation methods    are also defined.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Westerlund, et al.           Standards Track                    [Page 1]
 RFC 6679                 ECN for RTP over UDP/IP             August 2012

 Copyright Notice

   Copyright (c) 2012 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 ...