Sliding Window Random Linear Code (RLC) Forward Erasure Correction (FEC) Schemes for FECFRAME
draft-ietf-tsvwg-rlc-fec-scheme-01

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Last updated 2017-10-27
Replaces draft-roca-tsvwg-rlc-fec-scheme
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TSVWG                                                            V. Roca
Internet-Draft                                                  B. Teibi
Intended status: Standards Track                                   INRIA
Expires: April 29, 2018                                 October 26, 2017

Sliding Window Random Linear Code (RLC) Forward Erasure Correction (FEC)
                          Schemes for FECFRAME
                   draft-ietf-tsvwg-rlc-fec-scheme-01

Abstract

   This document describes two fully-specified FEC Schemes for Sliding
   Window Random Linear Codes (RLC), one for RLC over GF(2) (binary
   case), a second one for RLC over GF(2^^8), both of them with the
   possibility of controlling the code density.  They are meant to
   protect arbitrary media streams along the lines defined by FECFRAME
   extended to sliding window FEC 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.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents

Roca & Teibi             Expires April 29, 2018                 [Page 1]
Internet-Draft               RLC FEC Scheme                 October 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 . . . . . . . . . . . .   4
     1.3.  Small Transmission Overheads with the Sliding Window RLC
           FEC Scheme  . . . . . . . . . . . . . . . . . . . . . . .   5
     1.4.  Document Organization . . . . . . . . . . . . . . . . . .   5
   2.  Definitions and Abbreviations . . . . . . . . . . . . . . . .   6
   3.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Parameters Derivation . . . . . . . . . . . . . . . . . .   6
     3.2.  ADU, ADUI and Source Symbols Mappings . . . . . . . . . .   8
     3.3.  Encoding Window Management  . . . . . . . . . . . . . . .   9
     3.4.  Pseudo-Random Number Generator  . . . . . . . . . . . . .  10
     3.5.  Coding Coefficients Generation Function . . . . . . . . .  11
   4.  Sliding Window RLC FEC Scheme over GF(2) for Arbitrary ADU
       Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
     4.1.  Formats and Codes . . . . . . . . . . . . . . . . . . . .  13
       4.1.1.  FEC Framework Configuration Information . . . . . . .  13
       4.1.2.  Explicit Source FEC Payload ID  . . . . . . . . . . .  13
       4.1.3.  Repair FEC Payload ID . . . . . . . . . . . . . . . .  14
       4.1.4.  Additional Procedures . . . . . . . . . . . . . . . .  14
   5.  Sliding Window RLC FEC Scheme over GF(2^^8) for Arbitrary ADU
       Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
     5.1.  Formats and Codes . . . . . . . . . . . . . . . . . . . .  14
       5.1.1.  FEC Framework Configuration Information . . . . . . .  14
       5.1.2.  Explicit Source FEC Payload ID  . . . . . . . . . . .  15
       5.1.3.  Repair FEC Payload ID . . . . . . . . . . . . . . . .  16
       5.1.4.  Additional Procedures . . . . . . . . . . . . . . . .  17
   6.  FEC Code Specification  . . . . . . . . . . . . . . . . . . .  17
     6.1.  Encoding Side . . . . . . . . . . . . . . . . . . . . . .  17
     6.2.  Decoding Side . . . . . . . . . . . . . . . . . . . . . .  18
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