Sliding Window Random Linear Code (RLC) Forward Erasure Correction (FEC) Schemes for FECFRAME
draft-ietf-tsvwg-rlc-fec-scheme-06

Document Type Active Internet-Draft (tsvwg WG)
Last updated 2018-08-01 (latest revision 2018-07-25)
Replaces draft-roca-tsvwg-rlc-fec-scheme
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Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication (wg milestone: Jun 2018 - Submit "Sliding Wind... )
Document shepherd Wesley Eddy
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Send notices to David Black <david.black@dell.com>, Wesley Eddy <wes@mti-systems.com>
TSVWG                                                            V. Roca
Internet-Draft                                                  B. Teibi
Intended status: Standards Track                                   INRIA
Expires: January 26, 2019                                  July 25, 2018

Sliding Window Random Linear Code (RLC) Forward Erasure Correction (FEC)
                          Schemes for FECFRAME
                   draft-ietf-tsvwg-rlc-fec-scheme-06

Abstract

   This document describes two fully-specified Forward Erasure
   Correction (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), 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 (c) 2018 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
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Roca & Teibi            Expires January 26, 2019                [Page 1]
Internet-Draft               RLC FEC Scheme                    July 2018

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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 . . . . . . . . . . . . . . . . . .   6
   2.  Definitions and Abbreviations . . . . . . . . . . . . . . . .   6
   3.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.1.  Possible Parameter Derivations  . . . . . . . . . . . . .   7
       3.1.1.  Case of a CBR Real-Time Flow  . . . . . . . . . . . .   8
       3.1.2.  Other Types of Real-Time Flow . . . . . . . . . . . .  10
       3.1.3.  Case of a Non Real-Time Flow  . . . . . . . . . . . .  11
     3.2.  ADU, ADUI and Source Symbols Mappings . . . . . . . . . .  11
     3.3.  Encoding Window Management  . . . . . . . . . . . . . . .  12
     3.4.  Pseudo-Random Number Generator (PRNG) . . . . . . . . . .  13
     3.5.  Coding Coefficients Generation Function . . . . . . . . .  14
     3.6.  Finite Fields Operations  . . . . . . . . . . . . . . . .  17
       3.6.1.  Finite Field Definitions  . . . . . . . . . . . . . .  17
       3.6.2.  Linear Combination of Source Symbols Computation  . .  17
   4.  Sliding Window RLC FEC Scheme over GF(2^^8) for Arbitrary ADU
       Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
     4.1.  Formats and Codes . . . . . . . . . . . . . . . . . . . .  18
       4.1.1.  FEC Framework Configuration Information . . . . . . .  18
       4.1.2.  Explicit Source FEC Payload ID  . . . . . . . . . . .  19
       4.1.3.  Repair FEC Payload ID . . . . . . . . . . . . . . . .  20
       4.1.4.  Additional Procedures . . . . . . . . . . . . . . . .  21
   5.  Sliding Window RLC FEC Scheme over GF(2) for Arbitrary ADU
       Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
     5.1.  Formats and Codes . . . . . . . . . . . . . . . . . . . .  21
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