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I-D ACTION:draft-ietf-avt-ulp-05.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Audio/Video Transport Working Group of the IETF.

	Title		: An RTP Payload Format for Generic FEC with Uneven 
                          Level Protection
	Author(s)	: A. Li et al.
	Filename	: draft-ietf-avt-ulp-05.txt
	Pages		: 30
	Date		: 30-Apr-02
	
This document specifies a payload format for generic forward error
correction to achieve uneven level protection (ULP) for media data
encapsulated in RTP. It is an extension of the forward error
correction scheme specified in RFC 2733 [1], and it is based on the
same exclusive-or (parity) operation. This payload format allows end
systems to apply protection using arbitrary protection lengths and
levels, in addition to using arbitrary protection group sizes. It
also enables both complete recovery or partial recovery of the
critical payload and RTP header fields depending on the packet loss
situation. This scheme is completely backward compatible with non-FEC
capable hosts and with hosts that are only capable of handling the
FEC schemes specified in RFC 2733 [1]. Those receivers that do not
know about ULP forward error correction can simply ignore the
extensions.

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