Sliding Window Random Linear Code (RLC) Forward Erasure Correction (FEC) Scheme for FECFRAME
draft-ietf-tsvwg-rlc-fec-scheme-00

Document Type Active Internet-Draft (tsvwg WG)
Last updated 2017-07-20 (latest revision 2017-07-17)
Replaces draft-roca-tsvwg-rlc-fec-scheme
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TSVWG                                                            V. Roca
Internet-Draft                                                     INRIA
Intended status: Standards Track                           July 17, 2017
Expires: January 18, 2018

Sliding Window Random Linear Code (RLC) Forward Erasure Correction (FEC)
                          Scheme for FECFRAME
                   draft-ietf-tsvwg-rlc-fec-scheme-00

Abstract

   This document describes a fully-specified FEC scheme for the Sliding
   Window Random Linear Codes (RLC) over GF(2^^m), where m equals 1
   (binary case), 4 or 8, that can be used to protect arbitrary media
   streams along the lines defined by FECFRAME extended to sliding
   window codes.  These sliding window FEC codes rely on an encoding
   window that slides over the source symbols, generating new repair
   symbols whenever needed.  Compared to block FEC codes, these sliding
   window FEC codes offer key advantages with real-time flows in terms
   of reduced FEC-related latency while often providing improved erasure
   recovery capabilities.

Status of This Memo

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   Copyright (c) 2017 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
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   (http://trustee.ietf.org/license-info) in effect on the date of

Roca                    Expires January 18, 2018                [Page 1]
Internet-Draft               RLC FEC Scheme                    July 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Limits of Block Codes with Real-Time Flows  . . . . . . .   3
     1.2.  Lower Latency and Better Protection of Real-Time Flows
           with the Sliding Window RLC Codes . . . . . . . . . . . .   3
     1.3.  Small Transmission Overheads with the Sliding Window RLC
           FEC Scheme  . . . . . . . . . . . . . . . . . . . . . . .   4
     1.4.  Document Organization . . . . . . . . . . . . . . . . . .   5
   2.  Definitions and Abbreviations . . . . . . . . . . . . . . . .   5
   3.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Parameters Derivation . . . . . . . . . . . . . . . . . .   6
     3.2.  ADU, ADUI and Source Symbols Mappings . . . . . . . . . .   7
     3.3.  Encoding Window Management  . . . . . . . . . . . . . . .   9
     3.4.  Pseudo-Random Number Generator  . . . . . . . . . . . . .   9
     3.5.  Coding Coefficients Generation Function . . . . . . . . .  10
   4.  Sliding Window RLC FEC Scheme for Arbitrary ADU Flows . . . .  12
     4.1.  Formats and Codes . . . . . . . . . . . . . . . . . . . .  12
       4.1.1.  FEC Framework Configuration Information . . . . . . .  12
       4.1.2.  Explicit Source FEC Payload ID  . . . . . . . . . . .  13
       4.1.3.  Repair FEC Payload ID . . . . . . . . . . . . . . . .  13
       4.1.4.  Additional Procedures . . . . . . . . . . . . . . . .  15
   5.  FEC Code Specification  . . . . . . . . . . . . . . . . . . .  15
     5.1.  Encoding Side . . . . . . . . . . . . . . . . . . . . . .  15
     5.2.  Decoding Side . . . . . . . . . . . . . . . . . . . . . .  16
   6.  Implementation Status . . . . . . . . . . . . . . . . . . . .  16
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
     7.1.  Attacks Against the Data Flow . . . . . . . . . . . . . .  17
       7.1.1.  Access to Confidential Content  . . . . . . . . . . .  17
       7.1.2.  Content Corruption  . . . . . . . . . . . . . . . . .  17
     7.2.  Attacks Against the FEC Parameters  . . . . . . . . . . .  17
     7.3.  When Several Source Flows are to be Protected Together  .  18
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