Re: [tsvwg] I-D Action: draft-ietf-tsvwg-rlc-fec-scheme-04.txt
Vincent Roca <vincent.roca@inria.fr> Fri, 18 May 2018 07:13 UTC
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Date: Fri, 18 May 2018 09:13:14 +0200
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Subject: Re: [tsvwg] I-D Action: draft-ietf-tsvwg-rlc-fec-scheme-04.txt
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Dear all, Here is an updated version of our I-D. - It takes into accounts comments received by Jonathan Detchart (added section 3.6. Finite Fields Operations); - Section 3.1. Possible Parameter Derivations has been significantly improved for more precision; - It also fixes a small bug (in parameter checks) in section 3.5. Coding Coefficients Generation Function; We are not sure we will keep the current PRNG... Even with the previous fix (i.e., ignoring the first value produced), the Park-Miler minimal standard PRNG behaves badly when used with seeds that are in sequence (e.g., the application generates a repair symbol with seed s and then s+1, etc.) and when mapping the PRNG output to a small range of value (especially with [0, 15]): Ij+1 = A * s (modulo M) and: Ij+1 = A * (s+1) (modulo M) scaled to [0, 15] have a certain probability to give the same value. We are currently experimenting with alternatives. Unfortunately we only identified this side-effect recently. Cheers, Vincent and Belkacem > Le 18 mai 2018 à 08:51, internet-drafts@ietf.org a écrit : > > > A New Internet-Draft is available from the on-line Internet-Drafts directories. > This draft is a work item of the Transport Area Working Group WG of the IETF. > > Title : Sliding Window Random Linear Code (RLC) Forward Erasure Correction (FEC) Schemes for FECFRAME > Authors : Vincent Roca > Belkacem Teibi > Filename : draft-ietf-tsvwg-rlc-fec-scheme-04.txt > Pages : 31 > Date : 2018-05-17 > > 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), both of them 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. > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-tsvwg-rlc-fec-scheme/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-tsvwg-rlc-fec-scheme-04 > https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-rlc-fec-scheme-04 > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-tsvwg-rlc-fec-scheme-04 > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >
- [tsvwg] I-D Action: draft-ietf-tsvwg-rlc-fec-sche… internet-drafts
- Re: [tsvwg] I-D Action: draft-ietf-tsvwg-rlc-fec-… Vincent Roca