draft-ietf-avtext-multicast-acq-rtcp-xr-02.txt   draft-ietf-avtext-multicast-acq-rtcp-xr-03.txt 
AVT A. Begen AVT A. Begen
Internet-Draft E. Friedrich Internet-Draft E. Friedrich
Intended status: Standards Track Cisco Intended status: Standards Track Cisco
Expires: October 8, 2011 April 6, 2011 Expires: October 13, 2011 April 11, 2011
Multicast Acquisition Report Block Type for RTP Control Protocol (RTCP) Multicast Acquisition Report Block Type for RTP Control Protocol (RTCP)
Extended Reports (XRs) Extended Reports (XRs)
draft-ietf-avtext-multicast-acq-rtcp-xr-02 draft-ietf-avtext-multicast-acq-rtcp-xr-03
Abstract Abstract
In most RTP-based multicast applications, the RTP source sends inter- In most RTP-based multicast applications, the RTP source sends inter-
related data. Due to this interdependency, randomly joining RTP related data. Due to this interdependency, randomly joining RTP
receivers usually cannot start consuming the multicast data right receivers usually cannot start consuming the multicast data right
after they join the session. Thus, they often experience a random after they join the session. Thus, they often experience a random
acquisition delay. An RTP receiver can use one ore more different acquisition delay. An RTP receiver can use one ore more different
approaches to achieve rapid acquisition. Yet, due to various approaches to achieve rapid acquisition. Yet, due to various
factors, performance of the rapid acquisition methods usually varies. factors, performance of the rapid acquisition methods usually varies.
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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 October 8, 2011. This Internet-Draft will expire on October 13, 2011.
Copyright Notice Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the Copyright (c) 2011 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
carefully, as they describe your rights and restrictions with respect carefully, as they describe your rights and restrictions with respect
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Figure 3: Structure of a private extension Figure 3: Structure of a private extension
5. Session Description Protocol Signaling 5. Session Description Protocol Signaling
A new unilateral parameter is defined for the MA report block to be A new unilateral parameter is defined for the MA report block to be
used with the Session Description Protocol (SDP) [RFC4566] using the used with the Session Description Protocol (SDP) [RFC4566] using the
Augmented Backus-Naur Form (ABNF) [RFC5234]. It has the following Augmented Backus-Naur Form (ABNF) [RFC5234]. It has the following
syntax within the 'rtcp-xr' attribute [RFC3611]: syntax within the 'rtcp-xr' attribute [RFC3611]:
xr-format = <See RFC 3611>
xr-format /= multicast-acq-ext
multicast-acq-ext = "multicast-acq" multicast-acq-ext = "multicast-acq"
Figure 4 Figure 4
Refer to Section 5.1 of [RFC3611] for a detailed description and the Refer to Section 5.1 of [RFC3611] for a detailed description and the
full syntax of the "rtcp-xr" attribute. The "multicast-acq-ext" full syntax of the "rtcp-xr" attribute. The "multicast-acq-ext"
parameter is compatible with the definition of "format-ext" in the parameter is compatible with the definition of "format-ext" in the
"rtcp-xr" attribute. "rtcp-xr" attribute.
6. Security Considerations 6. Security Considerations
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in this document: in this document:
Ali Begen Ali Begen
abegen@cisco.com abegen@cisco.com
Note to the RFC Editor: In the following, please replace "XXXX" with Note to the RFC Editor: In the following, please replace "XXXX" with
the number of this document prior to publication as an RFC. the number of this document prior to publication as an RFC.
7.1. RTCP XR Block Type 7.1. RTCP XR Block Type
Type value 11 has been pre-registered with IANA for the "Multicast Note to IANA: Type value 11 has been pre-registered with IANA for
Acquisition Report Block" in the RTCP XR Block Type Registry. the "Multicast Acquisition Report Block" in the RTCP XR Block Type
Registry. Please replace the existing reference with the RFC number
of this document.
7.2. RTCP XR SDP Parameter 7.2. RTCP XR SDP Parameter
This document registers the SDP [RFC4566] parameter 'multicast-acq' This document registers the SDP [RFC4566] parameter 'multicast-acq'
for the 'rtcp-xr' attribute in the RTCP XR SDP Parameters Registry. for the 'rtcp-xr' attribute in the RTCP XR SDP Parameters Registry.
7.3. Multicast Acquisition Method Registry 7.3. Multicast Acquisition Method Registry
This document creates a new IANA registry for the MA methods. The This document creates a new IANA registry for the MA methods. The
registry is called the Multicast Acquisition Method Registry. This registry is called the Multicast Acquisition Method Registry. This
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