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Re: [AVT] WGLC: draft-ietf.avt-ulp-19.txt

Andrea Lorenzo VITALI <andrea.vitali@st.com> Thu, 30 November 2006 09:05 UTC

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Date: Thu, 30 Nov 2006 10:04:59 +0100
From: Andrea Lorenzo VITALI <andrea.vitali@st.com>
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To: Colin Perkins <csp@csperkins.org>
Subject: Re: [AVT] WGLC: draft-ietf.avt-ulp-19.txt
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Cc: "Even, Roni" <roni.even@polycom.co.il>, "Botzko, Stephen" <Stephen.Botzko@polycom.com>, avt@ietf.org
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> No - given the advances since RFC 2733 was published, I think it
> worthwhile to include further justification and explanation of where
> this fits in with other FEC schemes.

I didn't read all RFCs and all IETF drafts related to FEC, however I
used RFC2733 so I can mention two points which may have already discussed:

- as specified in RFC2733 the header contains a bitmap which specify
which packets have been XORed; it would be nice to save these bits and
implement something more flexible so that the decoder can guess what the
encoder has done (e.g. using the packet's sequence number and a
pseudo-random number generator) - Digital Fountains could be easily
implemented this way.

- allow more than XOR ops, e.g. GF(2^n) operations; so that XOR codes
will be just a special case and Reed-Solomon codes could be done.

  Andrea

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  Andrea VITALI                            andrea.vitali@st.com

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