Sliding Window Random Linear Code (RLC) Forward Erasure Correction (FEC) Schemes for FECFRAME
draft-ietf-tsvwg-rlc-fec-scheme-16

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Last updated 2019-06-26 (latest revision 2019-06-18)
Replaces draft-roca-tsvwg-rlc-fec-scheme
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TSVWG                                                            V. Roca
Internet-Draft                                                  B. Teibi
Intended status: Standards Track                                   INRIA
Expires: December 20, 2019                                 June 18, 2019

Sliding Window Random Linear Code (RLC) Forward Erasure Correction (FEC)
                          Schemes for FECFRAME
                   draft-ietf-tsvwg-rlc-fec-scheme-16

Abstract

   This document describes two fully-specified Forward Erasure
   Correction (FEC) Schemes for Sliding Window Random Linear Codes
   (RLC), one for RLC over the Galois Field (A.K.A.  Finite Field)
   GF(2), a second one for RLC over the Galois Field GF(2^^8), each time
   with the possibility of controlling the code density.  They can
   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 packet erasure recovery capabilities.

Status of This Memo

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Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Roca & Teibi            Expires December 20, 2019               [Page 1]
Internet-Draft               RLC FEC Scheme                    June 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Limits of Block Codes with Real-Time Flows  . . . . . . .   4
     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 . . . . . . . . . . . . . . . . . .   6
   2.  Definitions and Abbreviations . . . . . . . . . . . . . . . .   6
   3.  Common Procedures . . . . . . . . . . . . . . . . . . . . . .   7
     3.1.  Codec Parameters  . . . . . . . . . . . . . . . . . . . .   7
     3.2.  ADU, ADUI and Source Symbols Mappings . . . . . . . . . .   9
     3.3.  Encoding Window Management  . . . . . . . . . . . . . . .  10
     3.4.  Source Symbol Identification  . . . . . . . . . . . . . .  11
     3.5.  Pseudo-Random Number Generator (PRNG) . . . . . . . . . .  11
     3.6.  Coding Coefficients Generation Function . . . . . . . . .  13
     3.7.  Finite Fields Operations  . . . . . . . . . . . . . . . .  15
       3.7.1.  Finite Field Definitions  . . . . . . . . . . . . . .  15
       3.7.2.  Linear Combination of Source Symbols Computation  . .  15
   4.  Sliding Window RLC FEC Scheme over GF(2^^8) for Arbitrary
       Packet Flows  . . . . . . . . . . . . . . . . . . . . . . . .  16
     4.1.  Formats and Codes . . . . . . . . . . . . . . . . . . . .  16
       4.1.1.  FEC Framework Configuration Information . . . . . . .  16
       4.1.2.  Explicit Source FEC Payload ID  . . . . . . . . . . .  18
       4.1.3.  Repair FEC Payload ID . . . . . . . . . . . . . . . .  18
     4.2.  Procedures  . . . . . . . . . . . . . . . . . . . . . . .  20
   5.  Sliding Window RLC FEC Scheme over GF(2) for Arbitrary Packet
       Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
     5.1.  Formats and Codes . . . . . . . . . . . . . . . . . . . .  20
       5.1.1.  FEC Framework Configuration Information . . . . . . .  20
       5.1.2.  Explicit Source FEC Payload ID  . . . . . . . . . . .  20
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