Simple Low-Density Parity Check (LDPC) Staircase Forward Error Correction (FEC) Scheme for FECFRAME
RFC 6816

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Internet Engineering Task Force (IETF)                           V. Roca
Request for Comments: 6816                                         INRIA
Category: Standards Track                                      M. Cunche
ISSN: 2070-1721                                          INSA-Lyon/INRIA
                                                                J. Lacan
                                                 ISAE, Univ. of Toulouse
                                                           December 2012

            Simple Low-Density Parity Check (LDPC) Staircase
           Forward Error Correction (FEC) Scheme for FECFRAME

Abstract

   This document describes a fully specified simple Forward Error
   Correction (FEC) scheme for Low-Density Parity Check (LDPC) Staircase
   codes that can be used to protect media streams along the lines
   defined by FECFRAME.  These codes have many interesting properties:
   they are systematic codes, they perform close to ideal codes in many
   use-cases, and they also feature very high encoding and decoding
   throughputs.  LDPC-Staircase codes are therefore a good solution to
   protect a single high bitrate source flow or to protect globally
   several mid-rate flows within a single FECFRAME instance.  They are
   also a good solution whenever the processing load of a software
   encoder or decoder must be kept to a minimum.

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/rfc6816.

Roca, et al.                 Standards Track                    [Page 1]
RFC 6816            Simple LDPC-Staircase FEC Scheme       December 2012

Copyright Notice

   Copyright (c) 2012 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 6816            Simple LDPC-Staircase FEC Scheme       December 2012

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 ...............................................9
      4.2. ADU Block Creation .........................................9
      4.3. Source Block Creation .....................................11
   5. LDPC-Staircase FEC Scheme for Arbitrary ADU Flows ..............13
      5.1. Formats and Codes .........................................13
           5.1.1. FEC Framework Configuration Information ............13
           5.1.2. Explicit Source FEC Payload ID .....................14
           5.1.3. Repair FEC Payload ID ..............................16
      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
           6.1.2. Content Corruption .................................18
      6.2. Attacks against the FEC Parameters ........................18
      6.3. When Several Source Flows Are to Be Protected Together ....19
      6.4. Baseline Secure FEC Framework Operation ...................19
   7. Operations and Management Considerations .......................19
      7.1. Operational Recommendations ...............................19
   8. IANA Considerations ............................................21