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Simple Reed-Solomon Forward Error Correction (FEC) Scheme for FECFRAME
RFC 6865

Internet Engineering Task Force (IETF)                           V. Roca
Request for Comments: 6865                                         INRIA
Category: Standards Track                                      M. Cunche
ISSN: 2070-1721                                          INSA-Lyon/INRIA
                                                                J. Lacan
                                                 ISAE, Univ. of Toulouse
                                                          A. Bouabdallah
                                                                    CDTA
                                                            K. Matsuzono
                                                         Keio University
                                                           February 2013

 Simple Reed-Solomon Forward Error Correction (FEC) Scheme for FECFRAME

Abstract

   This document describes a fully-specified simple Forward Error
   Correction (FEC) scheme for Reed-Solomon codes over the finite field
   (also known as the Galois Field) GF(2^^m), with 2 <= m <= 16, that
   can be used to protect arbitrary media streams along the lines
   defined by FECFRAME.  The Reed-Solomon codes considered have
   attractive properties, since they offer optimal protection against
   packet erasures and the source symbols are part of the encoding
   symbols, which can greatly simplify decoding.  However, 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 the Low-Density Parity Check (LDPC) codes, for instance.

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/rfc6865.

Roca, et al.                 Standards Track                    [Page 1]
RFC 6865             Simple Reed-Solomon FEC Scheme        February 2013

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Roca, et al.                 Standards Track                    [Page 2]
RFC 6865             Simple Reed-Solomon FEC Scheme        February 2013

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 . . . . . . . . . . . . . . . . . . . . . . . .  9
     4.1.  Restrictions . . . . . . . . . . . . . . . . . . . . . . .  9
     4.2.  ADU Block Creation . . . . . . . . . . . . . . . . . . . .  9
     4.3.  Source Block Creation  . . . . . . . . . . . . . . . . . . 10
   5.  Simple Reed-Solomon FEC Scheme over GF(2^^m) for Arbitrary
       ADU Flows  . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     5.1.  Formats and Codes  . . . . . . . . . . . . . . . . . . . . 12
       5.1.1.  FEC Framework Configuration Information  . . . . . . . 12
       5.1.2.  Explicit Source FEC Payload ID . . . . . . . . . . . . 14
       5.1.3.  Repair FEC Payload ID  . . . . . . . . . . . . . . . . 15
     5.2.  Procedures . . . . . . . . . . . . . . . . . . . . . . . . 17
     5.3.  FEC Code Specification . . . . . . . . . . . . . . . . . . 17
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 17
     6.1.  Attacks Against the Data Flow  . . . . . . . . . . . . . . 17
       6.1.1.  Access to Confidential Content . . . . . . . . . . . . 17

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