draft-ietf-avtcore-feedback-supression-rtp-11.txt   draft-ietf-avtcore-feedback-supression-rtp-12.txt 
Network Working Group Q. Wu Network Working Group Q. Wu
Internet-Draft F. Xia Internet-Draft F. Xia
Intended status: Standards Track R. Even Intended status: Standards Track R. Even
Expires: August 13, 2012 Huawei Expires: August 20, 2012 Huawei
February 10, 2012 February 17, 2012
RTCP Extension for Third-party Loss Report RTCP Extension for Third-party Loss Report
draft-ietf-avtcore-feedback-supression-rtp-11 draft-ietf-avtcore-feedback-supression-rtp-12
Abstract Abstract
In a large RTP session using the RTCP feedback mechanism defined in In a large RTP session using the RTCP feedback mechanism defined in
RFC 4585, a feedback target may experience transient overload if some RFC 4585, a feedback target may experience transient overload if some
event causes a large number of receivers to send feedback at once. event causes a large number of receivers to send feedback at once.
This overload is usually avoided by ensuring that feedback reports This overload is usually avoided by ensuring that feedback reports
are forwarded to all receivers, allowing them to avoid sending are forwarded to all receivers, allowing them to avoid sending
duplicate feedback reports. However, there are cases where it is not duplicate feedback reports. However, there are cases where it is not
recommended to forward feedback reports, and this may allow feedback recommended to forward feedback reports, and this may allow feedback
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 13, 2012. This Internet-Draft will expire on August 20, 2012.
Copyright Notice Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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0 1 2 3 0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC | | SSRC |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: Syntax of an FCI Entry in the PSLEI Feedback Message Figure 2: Syntax of an FCI Entry in the PSLEI Feedback Message
Synchronization source (SSRC):32 bits Synchronization source (SSRC):32 bits
The SSRC value of the media source that has already been aware the The SSRC value of the media source that is already aware, or in
receiver lost synchronization with the video stream and signal to the process of being made aware, that some receiver lost
the receiver not sending a decoder refresh point. synchronization with the media stream and for which the PSLEI
receiver's own response to any such error is suppressed.
5. SDP Signaling 5. SDP Signaling
The Session Description Protocol (SDP) [RFC4566] attribute, rtcp-fb, The Session Description Protocol (SDP) [RFC4566] attribute, rtcp-fb,
is defined in the Section 4 of [RFC4585] and may be used to negotiate is defined in the Section 4 of [RFC4585] and may be used to negotiate
the capability to handle specific AVPF commands and indications. The the capability to handle specific AVPF commands and indications. The
ABNF for rtcp-fb is described in section 4.2 of [RFC4585]. In this ABNF for rtcp-fb is described in section 4.2 of [RFC4585]. In this
section, we extend the rtcp-fb attribute to include the commands and section, we extend the rtcp-fb attribute to include the commands and
indications that are described for third party loss report in the indications that are described for third party loss report in the
present document. present document.
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