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Delayed Duplication Attribute in SDP Duplication Grouping Semantics in SDP

Delayed Duplication Attribute in SDP Duplication 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. Motivation.

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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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