Internet Engineering Task Force (IETF) M. Watson
Request for Comments: 6681 Netflix
Category: Standards Track T. Stockhammer
ISSN: 2070-1721 Nomor Research
M. Luby
Qualcomm Incorporated
August 2012
Raptor Forward Error Correction (FEC) Schemes for FECFRAME
Abstract
This document describes Fully-Specified Forward Error Correction
(FEC) Schemes for the Raptor and RaptorQ codes and their application
to reliable delivery of media streams in the context of the FEC
Framework. The Raptor and RaptorQ codes are systematic codes, where
a number of repair symbols are generated from a set of source symbols
and sent in one or more repair flows in addition to the source
symbols that are sent to the receiver(s) within a source flow. The
Raptor and RaptorQ codes offer close to optimal protection against
arbitrary packet losses at a low computational complexity. Six FEC
Schemes are defined: two for the protection of arbitrary packet
flows, two that are optimized for small source blocks, and two for
the protection of a single flow that already contains a sequence
number. Repair data may be sent over arbitrary datagram transport
(e.g., UDP) or using RTP.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by
the Internet Engineering Steering Group (IESG). Further
information on Internet Standards is available in Section 2 of
RFC 5741.
Information about the current status of this document, any
errata, and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6681.
Watson, et al. Standards Track [Page 1]RFC 6681 Raptor FEC Scheme August 2012Copyright Notice
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Watson, et al. Standards Track [Page 2]RFC 6681 Raptor FEC Scheme August 2012Table of Contents
1. Introduction ....................................................4
2. Document Outline ................................................5
3. Requirements Notation ...........................................5
4. Definitions and Abbreviations ...................................5
4.1. Definitions ................................................6
4.2. Abbreviations ..............................................6
5. General Procedures for Raptor FEC Schemes .......................6
6. Raptor FEC Schemes for Arbitrary Packet Flows ...................8
6.1. Introduction ...............................................8
6.2. Formats and Codes ..........................................8
6.2.1. FEC Framework Configuration Information .............8
6.2.2. Source FEC Payload ID ...............................9
6.2.3. Repair FEC Payload ID ..............................10
6.3. Procedures ................................................11
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