RTP Control Protocol (RTCP) Extension for a Third-Party Loss Report
RFC 6642
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Document |
Type |
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RFC - Proposed Standard
(June 2012; No errata)
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Authors |
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Qin Wu
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Frank Xia
,
Roni Even
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Last updated |
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2015-10-14
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Replaces |
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draft-wu-avt-retransmission-supression-rtp
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Stream |
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IETF
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plain text
html
pdf
htmlized
bibtex
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Reviews |
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Stream |
WG state
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Submitted to IESG for Publication
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Document shepherd |
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Magnus Westerlund
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Shepherd write-up |
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Show
(last changed 2012-02-23)
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IESG |
IESG state |
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RFC 6642 (Proposed Standard)
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Robert Sparks
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IESG note |
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Magnus Westerlund (magnus.westerlund@ericsson.com) is the document shepherd.
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Send notices to |
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(None)
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Internet Engineering Task Force (IETF) Q. Wu, Ed.
Request for Comments: 6642 F. Xia
Category: Standards Track R. Even
ISSN: 2070-1721 Huawei
June 2012
RTP Control Protocol (RTCP) Extension for a Third-Party Loss Report
Abstract
In a large RTP session using the RTP Control Protocol (RTCP) feedback
mechanism defined in RFC 4585, a feedback target may experience
transient overload if some event causes a large number of receivers
to send feedback at once. This overload is usually avoided by
ensuring that feedback reports are forwarded to all receivers,
allowing them to avoid sending duplicate feedback reports. However,
there are cases where it is not recommended to forward feedback
reports, and this may allow feedback implosion. This memo discusses
these cases and defines a new RTCP Third-Party Loss Report that can
be used to inform receivers that the feedback target is aware of some
loss event, allowing them to suppress feedback. Associated Session
Description Protocol (SDP) signaling is 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/rfc6642.
Wu, et al. Standards Track [Page 1]
RFC 6642 Third-Party Loss Report June 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.
Table of Contents
1. Introduction ....................................................3
2. Terminology .....................................................3
2.1. Requirements Notation ......................................3
2.2. Glossary ...................................................4
3. Example Use Cases ...............................................4
3.1. Source-Specific Multicast (SSM) Use Case ...................4
3.2. Unicast-Based Rapid Acquisition of Multicast Stream
(RAMS) Use Case ............................................5
3.3. RTP Transport Translator Use Case ..........................5
3.4. Multipoint Control Unit (MCU) Use Case .....................6
3.5. Mixer Use Case .............................................6
4. Protocol Overview ...............................................6
5. Format of RTCP Feedback Messages ................................7
5.1. Transport-Layer Feedback: Third-Party Loss Report (TPLR) ...8
5.2. Payload-Specific Feedback: Third-Party Loss Report (TPLR) .8
6. SDP Signaling ...................................................9
7. Security Considerations ........................................10
8. IANA Considerations ............................................11
9. Acknowledgments ................................................11
10. References ....................................................12
10.1. Normative References .....................................12
10.2. Informative References ...................................12
Wu, et al. Standards Track [Page 2]
RFC 6642 Third-Party Loss Report June 2012
1. Introduction
The RTP Control Protocol (RTCP) feedback messages [RFC4585] allow the
receivers in an RTP session to report events and ask for action from
the media source (or a delegated feedback target when using unicast
RTCP feedback with Source-Specific Multicast (SSM) [RFC5760]). There
are cases where multiple receivers may initiate the same, or an
equivalent, message towards the same media source or the same
feedback target. When the receiver count is large, this behavior may
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