Explicit Congestion Notification (ECN) for RTP over UDP
draft-ietf-avtcore-ecn-for-rtp-07
| The information below is for an old version of the document | |||
|---|---|---|---|
| Document | Type | Active Internet-Draft (avtcore WG) | |
| Last updated | 2012-04-12 (latest revision 2012-03-30) | ||
| Replaces | draft-ietf-avt-ecn-for-rtp | ||
| Stream | IETF | ||
| Intended RFC status | Proposed Standard | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Roni Even | ||
| IESG | IESG state | IESG Evaluation::AD Followup | |
| Consensus Boilerplate | Unknown | ||
| Telechat date |
Needs a YES. Needs 9 more YES or NO OBJECTION positions to pass. |
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| Responsible AD | Robert Sparks | ||
| IESG note | Roni Even (even.roni@huawei.com) is the document shepherd. | ||
| Send notices to | avtcore-chairs@tools.ietf.org, draft-ietf-avtcore-ecn-for-rtp@tools.ietf.org | ||
Network Working Group M. Westerlund
Internet-Draft I. Johansson
Intended status: Standards Track Ericsson
Expires: October 1, 2012 C. Perkins
University of Glasgow
P. O'Hanlon
University of Oxford
K. Carlberg
G11
March 30, 2012
Explicit Congestion Notification (ECN) for RTP over UDP
draft-ietf-avtcore-ecn-for-rtp-07
Abstract
This memo specifies how Explicit Congestion Notification (ECN) can be
used with the Real-time Transport Protocol (RTP) running over UDP,
using 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 initialization method using
Interactive Connectivity Establishment (ICE). Signalling and
procedures for negotiation of capabilities and initialization methods
are also defined.
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
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on October 1, 2012.
Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the
Westerlund, et al. Expires October 1, 2012 [Page 1]
Internet-Draft ECN for RTP over UDP/IP March 2012
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
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Westerlund, et al. Expires October 1, 2012 [Page 2]
Internet-Draft ECN for RTP over UDP/IP March 2012
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Conventions, Definitions and Acronyms . . . . . . . . . . . . 5
3. Discussion, Requirements, and Design Rationale . . . . . . . . 6
3.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 7
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 . . . . . . . . . . . . . 25
6.3. XR Block ECN SDP Parameter . . . . . . . . . . . . . . . . 25
6.4. ICE Parameter to Signal ECN Capability . . . . . . . . . . 26
7. Use of ECN with RTP/UDP/IP . . . . . . . . . . . . . . . . . . 26
7.1. Negotiation of ECN Capability . . . . . . . . . . . . . . 26
7.2. Initiation of ECN Use in an RTP Session . . . . . . . . . 27
7.3. Ongoing Use of ECN Within an RTP Session . . . . . . . . . 34
7.4. Detecting Failures . . . . . . . . . . . . . . . . . . . . 37
8. Processing ECN in RTP Translators and Mixers . . . . . . . . . 41
8.1. Transport Translators . . . . . . . . . . . . . . . . . . 41
8.2. Fragmentation and Reassembly in Translators . . . . . . . 42
8.3. Generating RTCP ECN Feedback in Media Transcoders . . . . 44
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