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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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Delayed duplication attribute in sdp duplication grouping semantics in sdp

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


Motivation

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


Seeking adoption

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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