Simple Reed-Solomon Forward Error Correction (FEC) Scheme for FECFRAME
draft-ietf-fecframe-simple-rs-02
FecFrame V. Roca
Internet-Draft INRIA
Intended status: Standards Track M. Cunche
Expires: June 1, 2012 NICTA
J. Lacan
A. Bouabdallah
ISAE/LAAS-CNRS
K. Matsuzono
Keio University
November 29, 2011
Simple Reed-Solomon Forward Error Correction (FEC) Scheme for FECFRAME
draft-ietf-fecframe-simple-rs-02
Abstract
This document describes a fully-specified simple FEC scheme for Reed-
Solomon codes over GF(2^^m), with 2 <= m <= 16, that can be used to
protect arbitrary media streams along the lines defined by the
FECFRAME framework. Reed-Solomon codes belong to the class of
Maximum Distance Separable (MDS) codes which means they offer optimal
protection against packet erasures. They are also systematic codes,
which means that the source symbols are part of the encoding symbols.
The price to pay is a limit on the maximum source block size, on the
maximum number of encoding symbols, and a computational complexity
higher than that of LDPC codes for instance.
Status of this Memo
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Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the
Roca, et al. Expires June 1, 2012 [Page 1]
Internet-Draft Simple Reed-Solomon FEC Scheme November 2011
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Definitions Notations and Abbreviations . . . . . . . . . . . 5
3.1. Definitions . . . . . . . . . . . . . . . . . . . . . . . 5
3.2. Notations . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 8
4. Common Procedures Related to the ADU Block and Source
Block Creation . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1. Restrictions . . . . . . . . . . . . . . . . . . . . . . . 8
4.2. ADU Block Creation . . . . . . . . . . . . . . . . . . . . 8
4.3. Source Block Creation . . . . . . . . . . . . . . . . . . 9
5. Simple Reed-Solomon FEC Scheme over GF(2^^m) for Arbitrary
ADU Flows . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1. Formats and Codes . . . . . . . . . . . . . . . . . . . . 11
5.1.1. FEC Framework Configuration Information . . . . . . . 11
5.1.2. Explicit Source FEC Payload ID . . . . . . . . . . . . 13
5.1.3. Repair FEC Payload ID . . . . . . . . . . . . . . . . 14
5.2. Procedures . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3. FEC Code Specification . . . . . . . . . . . . . . . . . . 16
6. Security Considerations . . . . . . . . . . . . . . . . . . . 16
6.1. Attacks Against the Data Flow . . . . . . . . . . . . . . 16
6.1.1. Access to Confidential Content . . . . . . . . . . . . 16
6.1.2. Content Corruption . . . . . . . . . . . . . . . . . . 16
6.2. Attacks Against the FEC Parameters . . . . . . . . . . . . 16
6.3. When Several Source Flows are to be Protected Together . . 17
6.4. Baseline Secure FEC Framework Operation . . . . . . . . . 18
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