FEC Framework (fecframe) ------------------------ Charter Last Modified: 2011-12-09 Current Status: Active Working Group Chair(s): Greg Shepherd Transport Area Director(s): David Harrington Martin Stiemerling Wesley Eddy Transport Area Advisor: David Harrington Mailing Lists: General Discussion:fecframe@ietf.org 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 ------ ------- -------------------------------------------- Jul 2008 Sep 2011 Methods to convey FEC Framework Configuration Information Aug 2008 Dec 2009 Guidelines for Implementing DVB-IPTV Application-Layer Hybrid FEC Protection Oct 2008 Nov 2011 Raptor FEC Schemes for FECFRAME Oct 2008 Oct 2011 Pseudo Content Delivery Protocol (CDP) for Protecting Multiple Source Flows in FEC Framework Mar 2009 Nov 2011 RTP Payload Format for Raptor FEC Mar 2011 Nov 2011 Simple Reed-Solomon Forward Error Correction (FEC) Scheme for FECFRAME Sep 2011 Nov 2011 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