Duplication Grouping Semantics in the Session Description Protocol
draft-ietf-mmusic-duplication-grouping-00

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Document Type Active Internet-Draft (mmusic WG)
Last updated 2013-02-28 (latest revision 2012-10-12)
Replaces draft-begen-mmusic-redundancy-grouping
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MMUSIC                                                          A. Begen
Internet-Draft                                                     Cisco
Intended status:  Standards Track                                 Y. Cai
Expires:  April 6, 2013                                        Microsoft
                                                                   H. Ou
                                                                   Cisco
                                                         October 3, 2012

   Duplication Grouping Semantics in the Session Description Protocol
               draft-ietf-mmusic-duplication-grouping-00

Abstract

   Packet loss is undesirable for real-time multimedia sessions, but can
   occur due to congestion, or other unplanned network outages.  This is
   especially true for IP multicast networks, where packet loss patterns
   can vary greatly between receivers.  One technique that can be used
   to recover from packet loss without incurring unbounded delay for all
   the receivers is to duplicate the packets and send them in separate
   redundant streams.  This document defines the semantics for grouping
   redundant streams in the Session Description Protocol (SDP).  The
   semantics defined in this document are to be used with the SDP
   Grouping Framework [RFC5888].  SSRC-level (Synchronization Source)
   grouping semantics are also defined in this document for RTP streams
   using SSRC multiplexing.

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
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   This Internet-Draft will expire on April 6, 2013.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Begen, et al.             Expires April 6, 2013                 [Page 1]
Internet-Draft    Duplication Grouping Semantics in SDP     October 2012

   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
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   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.  Requirements Notation . . . . . . . . . . . . . . . . . . . . . 3
   3.  Duplication Grouping  . . . . . . . . . . . . . . . . . . . . . 3
     3.1.  "DUP" Grouping Semantics  . . . . . . . . . . . . . . . . . 3
     3.2.  DUP Grouping for SSRC-Multiplexed RTP Streams . . . . . . . 4
     3.3.  SDP Offer/Answer Model Considerations . . . . . . . . . . . 4
   4.  SDP Examples  . . . . . . . . . . . . . . . . . . . . . . . . . 5
     4.1.  Separate Source Addresses . . . . . . . . . . . . . . . . . 5
     4.2.  Separate Destination Addresses  . . . . . . . . . . . . . . 5
     4.3.  Temporal Redundancy . . . . . . . . . . . . . . . . . . . . 6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 8
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 9

Begen, et al.             Expires April 6, 2013                 [Page 2]
Internet-Draft    Duplication Grouping Semantics in SDP     October 2012

1.  Introduction

   The Real-time Transport Protocol (RTP) [RFC3550] is widely used today
   for delivering IPTV traffic, and other real-time multimedia sessions.
   Many of these applications support very large numbers of receivers,
   and rely on intra-domain UDP/IP multicast for efficient distribution
   of traffic within the network.
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