IETF 80 Proceedings

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FEC Framework (fecframe) (WG)

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Additional information is available at tools.ietf.org/wg/fecframe

Chair(s): Greg Shepherd Transport Area Director(s): David Harrington Wesley Eddy Transport Area Advisor: David Harrington

Meeting Slides

• FrameworkStatus
• LDPC_RTP_RS

Internet-Drafts:

• Forward Error Correction (FEC) Framework (97702 bytes)
• Session Description Protocol Elements for FEC Framework (37112 bytes)
• Methods to convey FEC Framework Configuration Information (36057 bytes)
• Guidelines for Implementing DVB-IPTV Application-Layer Hybrid FEC Protection (24282 bytes)
• Raptor FEC Schemes for FECFRAME (41463 bytes)
• RTP Payload Format for Raptor FEC (36764 bytes)
• Simple Reed-Solomon Forward Error Correction (FEC) Scheme for FECFRAME (45893 bytes)

Request for Comments:

• RTP Payload Format for 1-D Interleaved Parity Forward Error Correction (FEC) (RFC 6015) (65399 bytes)

Charter (as of 2009-11-09)

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
Mar 2008		FEC Grouping informational draft submitted to MMUSIC
Nov 2008		FEC Streaming Framework submitted as Proposed Standard
Nov 2008		FEC framework requirements submitted as Proposed Standard
Nov 2008		Usage of FEC framework with RTP submitted as Proposed Standard
Nov 2008		FEC SDP Elements submitted as Proposed Standard
Nov 2008		Discuss re-chartering