FEC Framework (fecframe)
------------------------

Charter
Last Modified: 2011-12-09

Current Status: Active Working Group

Chair(s):
    Greg Shepherd  <[email protected]>

Transport Area Director(s):
    David Harrington  <[email protected]>
    Martin Stiemerling  <[email protected]>
    Wesley Eddy  <[email protected]>

Transport Area Advisor:
    David Harrington  <[email protected]>

Mailing Lists:
    General Discussion:[email protected]
    To Subscribe:      https://www.ietf.org/mailman/listinfo/fecframe
    Archive:           http://www.ietf.org/mail-archive/web/fecframe

Description of Working Group:

The object of this group is to develop specifications for using forward
error correction (FEC) codes with applications in the Internet to
provide protection against packet loss. The group will develop a
protocol framework for application of FEC codes to arbitrary packet
flows over unreliable transport protocols over both IP multicast and
unicast. The application of the FEC codec on an aggregate of multiple
packet flows may be investigated and considered to be included in the
solution.

The FECFrame working group will use the building block approach (RFC
3269), especially the FEC Building Block (RFC 3452), developed by the
RMT working group. The FEC Building Block was developed to ensure that
the RMT framework developed can support multiple FEC codes and maintain
independence between FEC codes and protocols based on the framework.
The FECFrame WG may develop new FEC schemes if necessary to provide
substantial performance gains for the intended applications. However
the acceptance of any FEC scheme will require multiple, prior, detailed
reviews of the FEC code by independent experts from both the IETF and
the broader community, since it is likely that the IETF working group
will not include a large enough number of suitable experts in its
working set. If these reviews are positive, then Working Group
acceptance of an FEC scheme work item still needs the approval of the
responsible Area Director.

A primary objective of this framework is to support FEC for real-time
media applications using RTP over UDP, such as on demand streaming and
audio/video broadcast. Other potential usages of the framework may be
brought to the working group for consideration during the development
of the requirements, to enable future support of those usages. The
group will coordinate closely with the AVT and MMUSIC working groups to
ensure that the streaming use-case is fully specified both in terms of
interactions with RTP/RTCP and application layer signalling. The group
will also coordinate with the DCCP working group, at least to consider
that transport protocol's role in streaming media. The interactions of
the framework with existing and used security mechanisms must also be
considered.

The group will work with the RMT working group to ensure that the FEC
Building Block defined in RMT supports both the RMT use-cases (object
delivery over multicast) and the more general FEC protection of
flow(s) over unreliable unicast and multicast transport.

Specification of hybrid schemes involving both retransmission and
forward error correction is out of scope of the group.

Goals and Milestones:

  Done         Working Group consensus on requirements and their
               prioritization for the FEC protocol framework

  Done         Completed selection of solution to develop and mature

  Done         FEC framework requirements WG soft-freeze

  Done         FEC Streaming Framework WG soft-freeze

  Done         FEC Grouping informational draft submitted to MMUSIC

  Done         FEC Streaming Framework submitted as Proposed Standard

  Done         Usage of FEC framework with RTP submitted as Proposed Standard

  Done         FEC SDP Elements submitted as Proposed Standard

  Dec 2011       Transfer open FEC scheme documents to TSVWG


Internet-Drafts:

Posted Revised         I-D Title   <Filename>
------ ------- --------------------------------------------
Jul 2008 Sep 2011   <draft-ietf-fecframe-config-signaling-06.txt>
               Methods to convey FEC Framework Configuration Information

Aug 2008 Dec 2009   <draft-ietf-fecframe-dvb-al-fec-04.txt>
               Guidelines for Implementing DVB-IPTV Application-Layer Hybrid
               FEC Protection

Oct 2008 Nov 2011   <draft-ietf-fecframe-raptor-07.txt>
               Raptor FEC Schemes for FECFRAME

Oct 2008 Oct 2011   <draft-ietf-fecframe-pseudo-cdp-02.txt>
               Pseudo Content Delivery Protocol (CDP) for Protecting Multiple
               Source Flows in FEC Framework

Mar 2009 Nov 2011   <draft-ietf-fecframe-rtp-raptor-06.txt>
               RTP Payload Format for Raptor FEC

Mar 2011 Nov 2011   <draft-ietf-fecframe-simple-rs-02.txt>
               Simple Reed-Solomon Forward Error Correction (FEC) Scheme for
               FECFRAME

Sep 2011 Nov 2011   <draft-ietf-fecframe-ldpc-01.txt>
               Simple LDPC-Staircase Forward Error Correction (FEC) Scheme for
               FECFRAME

Request For Comments:

 RFC   Stat Published     Title
------- -- ----------- ------------------------------------
RFC6015 PS   Oct 2010    RTP Payload Format for 1-D Interleaved Parity Forward
                      Error Correction (FEC)

RFC6363 PS   Oct 2011    Forward Error Correction (FEC) Framework

RFC6364 PS   Oct 2011    Session Description Protocol Elements for FEC Framework

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