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 | |||
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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 | ||
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 10 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 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 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 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. 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 . . . . 44Show full document text