Simple Reed-Solomon Forward Error Correction (FEC) Scheme for FECFRAME
draft-ietf-fecframe-simple-rs-04

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FecFrame                                                         V. Roca
Internet-Draft                                                     INRIA
Intended status: Standards Track                               M. Cunche
Expires: April 6, 2013                                   INSA-Lyon/INRIA
                                                                J. Lacan
                                                          A. Bouabdallah
                                                 ISAE, Univ. of Toulouse
                                                            K. Matsuzono
                                                         Keio University
                                                         October 3, 2012

 Simple Reed-Solomon Forward Error Correction (FEC) Scheme for FECFRAME
                    draft-ietf-fecframe-simple-rs-04

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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   This Internet-Draft will expire on April 6, 2013.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the

Roca, et al.              Expires April 6, 2013                 [Page 1]
Internet-Draft       Simple Reed-Solomon FEC Scheme         October 2012

   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
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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