draft-ietf-mmusic-rfc4756bis-06.txt   draft-ietf-mmusic-rfc4756bis-07.txt 
MMUSIC A. Begen MMUSIC A. Begen
Internet-Draft Cisco Internet-Draft Cisco
Updates: 4756, 3388bis, 5576 February 11, 2010 Updates: 4756, 3388bis, 5576 April 2, 2010
(if approved) (if approved)
Intended status: Standards Track Intended status: Standards Track
Expires: August 15, 2010 Expires: October 4, 2010
Forward Error Correction Grouping Semantics in Session Description Forward Error Correction Grouping Semantics in Session Description
Protocol Protocol
draft-ietf-mmusic-rfc4756bis-06 draft-ietf-mmusic-rfc4756bis-07
Abstract Abstract
The Session Description Protocol (SDP) supports grouping media lines. The Session Description Protocol (SDP) supports grouping media lines.
SDP also has semantics defined for grouping the associated source and SDP also has semantics defined for grouping the associated source and
Forward Error Correction (FEC)-based repair flows. However, the Forward Error Correction (FEC)-based repair flows. However, the
semantics that was defined in RFC 4756 generally fail to provide the semantics that was defined in RFC 4756 generally fail to provide the
specific grouping relationships between the source and repair flows specific grouping relationships between the source and repair flows
when there are more than one source and/or repair flows in the same when there are more than one source and/or repair flows in the same
group. Furthermore, the existing semantics does not support group. Furthermore, the existing semantics does not support
describing additive repair flows. This document addresses these describing additive repair flows. This document addresses these
issues by introducing new FEC grouping semantics. SSRC-level issues by introducing new FEC grouping semantics. SSRC-level
grouping semantics is also introduced in this document for Real-time grouping semantics is also introduced in this document for Real-time
Transport Protocol (RTP) streams using SSRC multiplexing. Transport Protocol (RTP) streams using SSRC multiplexing.
Note to the RFC Editor: In the "Updates" line above, please replace
that with the RFC number for draft-ietf-mmusic-rfc3388bis-04 when
that draft is published as an RFC .
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF). Note that other groups may also distribute
other groups may also distribute working documents as Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts. 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."
The list of current Internet-Drafts can be accessed at This Internet-Draft will expire on October 4, 2010.
http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
This Internet-Draft will expire on August 15, 2010.
Copyright Notice Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the Copyright (c) 2010 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
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
skipping to change at page 2, line 18 skipping to change at page 2, line 15
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
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
described in the BSD License. described in the Simplified BSD License.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements Notation . . . . . . . . . . . . . . . . . . . . 5 2. Requirements Notation . . . . . . . . . . . . . . . . . . . . 5
3. Requirements and Changes from RFC 4756 . . . . . . . . . . . . 5 3. Requirements and Changes from RFC 4756 . . . . . . . . . . . . 5
3.1. Source and Repair Flow Association . . . . . . . . . . . . 5 3.1. Source and Repair Flow Association . . . . . . . . . . . . 5
3.2. Support for Additivity . . . . . . . . . . . . . . . . . . 6 3.2. Support for Additivity . . . . . . . . . . . . . . . . . . 6
4. FEC Grouping . . . . . . . . . . . . . . . . . . . . . . . . . 6 4. FEC Grouping . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1. New Grouping Semantics . . . . . . . . . . . . . . . . . . 6 4.1. New Grouping Semantics . . . . . . . . . . . . . . . . . . 6
skipping to change at page 13, line 42 skipping to change at page 13, line 42
Media Attributes in the Session Description Protocol Media Attributes in the Session Description Protocol
(SDP)", RFC 5576, June 2009. (SDP)", RFC 5576, June 2009.
[RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax [RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234, January 2008. Specifications: ABNF", STD 68, RFC 5234, January 2008.
8.2. Informative References 8.2. Informative References
[I-D.ietf-fecframe-framework] [I-D.ietf-fecframe-framework]
Watson, M., "Forward Error Correction (FEC) Framework", Watson, M., "Forward Error Correction (FEC) Framework",
draft-ietf-fecframe-framework-05 (work in progress), draft-ietf-fecframe-framework-07 (work in progress),
July 2009. March 2010.
[RFC4756] Li, A., "Forward Error Correction Grouping Semantics in [RFC4756] Li, A., "Forward Error Correction Grouping Semantics in
Session Description Protocol", RFC 4756, November 2006. Session Description Protocol", RFC 4756, November 2006.
[RFC3388] Camarillo, G., Eriksson, G., Holler, J., and H. [RFC3388] Camarillo, G., Eriksson, G., Holler, J., and H.
Schulzrinne, "Grouping of Media Lines in the Session Schulzrinne, "Grouping of Media Lines in the Session
Description Protocol (SDP)", RFC 3388, December 2002. Description Protocol (SDP)", RFC 3388, December 2002.
Author's Address Author's Address
 End of changes. 10 change blocks. 
18 lines changed or deleted 15 lines changed or added

This html diff was produced by rfcdiff 1.38. The latest version is available from http://tools.ietf.org/tools/rfcdiff/