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Delayed Duplication Attribute in SDP Duplication Grouping Semantics in SDP

This document addresses the challenges of packet loss in multicast scenarios, particularly due to congestion and network outages. It introduces a solution by proposing the use of redundant streams, specifically focusing on duplicates of original source packets. The drafts presented define a new SDP attribute for temporally interleaved redundant streams and establish grouping semantics for RTP streams, facilitating improved redundancy management. As the adoption of RTP stream duplication advances, it's crucial for MMUSIC to consider these drafts for enhanced streaming reliability.

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Delayed Duplication Attribute in SDP Duplication Grouping Semantics in SDP

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  1. Delayed Duplication Attribute in SDPDuplication Grouping Semantics in SDP IETF 84 – July 2012 draft-begen-mmusic-temporal-interleaving-04 draft-begen-mmusic-redundancy-grouping-03 Ali C. Begen, Yiqun Cai and Heidi Ou {abegen, ycai, hou}@cisco.com

  2. Motivation • Packet loss is unavoidable due to congestion or network outages • It is especially more problematic in multicasting due to large fanout • One basic recovery (within a bounded delay and bandwidth) method is to send redundant stream(s) • A redundant stream can carry FEC-like data or the duplicates of the original source packets • Here we are interested in methods where duplicates are used • We focus on dual streaming but triple or quadruple streaming is also possible • SDP does not have the semantics for describing redundant streams • These documents • Define an SDP attribute for temporally interleaved redundant streams • Define grouping semantics for redundant RTP streams • Define SSRC-level grouping semantics for SSRC-muxed redundant RTP streams

  3. Seeking Adoption • Duplicating RTP Streams (draft-ietf-avtext-rtp-duplication) has recently been adopted by AVTEXT • It normatively requires these two MMUSIC drafts • Could MMUSIC adopt these two drafts?

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