Explicit Congestion Notification (ECN) for RTP over UDP
RFC 6679
| Document | Type |
RFC - Proposed Standard
(August 2012; Errata)
Updated by RFC 8311
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Replaces | draft-ietf-avt-ecn-for-rtp | ||
| Stream | IETF | ||
| Formats | plain text pdf htmlized with errata bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Roni Even | ||
| IESG | IESG state | RFC 6679 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Robert Sparks | ||
| IESG note | Roni Even (even.roni@huawei.com) is the document shepherd. | ||
| Send notices to | (None) | ||
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
Abstract
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
http://www.rfc-editor.org/info/rfc6679.
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
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.
Westerlund, et al. Standards Track [Page 2]
RFC 6679 ECN for RTP over UDP/IP August 2012
Table of Contents
1. Introduction ....................................................4
2. Conventions, Definitions, and Acronyms ..........................5
3. Discussion, Requirements, and Design Rationale ..................6
3.1. Requirements ...............................................8
3.2. Applicability ..............................................8
3.3. Interoperability ..........................................12
4. Overview of Use of ECN with RTP/UDP/IP .........................13
5. RTCP Extensions for ECN Feedback ...............................16
5.1. RTP/AVPF Transport-Layer ECN Feedback Packet ..............16
5.2. RTCP XR Report Block for ECN Summary Information ..........19
6. SDP Signalling Extensions for ECN ..............................21
6.1. Signalling ECN Capability Using SDP .......................21
6.2. RTCP ECN Feedback SDP Parameter ...........................26
6.3. XR Block ECN SDP Parameter ................................26
6.4. ICE Parameter to Signal ECN Capability ....................27
7. Use of ECN with RTP/UDP/IP .....................................27
7.1. Negotiation of ECN Capability .............................27
7.2. Initiation of ECN Use in an RTP Session ...................28
7.3. Ongoing Use of ECN within an RTP Session ..................35
7.4. Detecting Failures ........................................38
8. Processing ECN in RTP Translators and Mixers ...................42
8.1. Transport Translators .....................................42
8.2. Fragmentation and Reassembly in Translators ...............43
8.3. Generating RTCP ECN Feedback in Media Transcoders .........45
8.4. Generating RTCP ECN Feedback in Mixers ....................46
9. Implementation Considerations ..................................47
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