Duplication Grouping Semantics in the Session Description Protocol
draft-ietf-mmusic-duplication-grouping-01

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Document Type Active Internet-Draft (mmusic WG)
Last updated 2013-03-19
Replaces draft-begen-mmusic-redundancy-grouping
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MMUSIC                                                          A. Begen
Internet-Draft                                                     Cisco
Intended status:  Standards Track                                 Y. Cai
Expires:  September 21, 2013                                   Microsoft
                                                                   H. Ou
                                                                   Cisco
                                                          March 20, 2013

   Duplication Grouping Semantics in the Session Description Protocol
               draft-ietf-mmusic-duplication-grouping-01

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.

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   This Internet-Draft will expire on September 21, 2013.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Begen, et al.          Expires September 21, 2013               [Page 1]
Internet-Draft    Duplication Grouping Semantics in SDP       March 2013

   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
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   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.  Duplication 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 . . . . . . . . . . . . . . . . . . . . . . . . 7
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 8
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 9

Begen, et al.          Expires September 21, 2013               [Page 2]
Internet-Draft    Duplication Grouping Semantics in SDP       March 2013

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
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