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Re: [nwcrg] [dtn] Network Coding and SATCOM - call for review

Muriel Medard <medard@mit.edu> Wed, 14 November 2018 03:36 UTC

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From: Muriel Medard <medard@mit.edu>
To: "marie@mjmontpetit.com" <marie@mjmontpetit.com>
CC: Lloyd Wood <lloyd.wood@yahoo.co.uk>, "vincent.roca@inria.fr" <vincent.roca@inria.fr>, Kuhn Nicolas <Nicolas.Kuhn@cnes.fr>, "Tomaso.deCola@dlr.de" <Tomaso.deCola@dlr.de>, "nwcrg@irtf.org" <nwcrg@irtf.org>
Thread-Topic: [nwcrg] [dtn] Network Coding and SATCOM - call for review
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Date: Wed, 14 Nov 2018 03:35:56 +0000
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References: <F3B0A07CFD358240926B78A680E166FF1768B2D7@TW-MBX-P03.cnesnet.ad.cnes.fr> <60755266.18907.1541555470144@mail.yahoo.com> <F3B0A07CFD358240926B78A680E166FF1768CFBF@TW-MBX-P03.cnesnet.ad.cnes.fr> <1A39DCC13AF3C14B83CD74124D4DCFC337F9E005@DLDEFFMIMP02EXC.intra.dlr.de> <3A352D2A-12EF-4F9B-83E8-04712DBA1281@mjmontpetit.com> <F3B0A07CFD358240926B78A680E166FF17695E0B@TW-MBX-P02.cnesnet.ad.cnes.fr> <1A39DCC13AF3C14B83CD74124D4DCFC337F9F3FB@DLDEFFMIMP02EXC.intra.dlr.de> <F3B0A07CFD358240926B78A680E166FF176963E2@TW-MBX-P02.cnesnet.ad.cnes.fr> <1864986906.139945.1542162904939@mail.yahoo.com> <6561B0E3-5CB3-415A-B443-6E8456E98698@mjmontpetit.com>
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Subject: Re: [nwcrg] [dtn] Network Coding and SATCOM - call for review
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Dear all,

Actually, the experiments are ongoing and extensive, so there is a lot more data.

Best,

Muriel


Muriel Médard
Cecil H. Green Professor of EECS
Massachusetts Institute of Technology.





On Nov 13, 2018, at 10:28 PM, Marie-Jose Montpetit <marie@mjmontpetit.com<mailto:marie@mjmontpetit.com>> wrote:

Yes this is a study done a few years ago.

Marie-José Montpetit
marie@mjmontpetit.com<mailto:marie@mjmontpetit.com>
mariejo@mit.edu

On Nov 13, 2018, at 6:35 PM, Lloyd Wood <lloyd.wood@yahoo.co.uk> wrote:

Likely relevant to this draft:


Can network coding bridge the digital divide in the Pacific?, Spiedel et al.,
International Symposium on Network Coding (NetCod), Sydney, June 2015.


http://arxiv.org/abs/1506.01048
http://dx.doi.org/10.1109/NETCOD.2015.7176795
https://internetnz.nz/sites/default/files/IR201404%20-%20University%20of%20Auckland%20-%20FINAL%20REPORT%20April%202015.pdf
https://conference.apnic.net/data/41/apricot-talk_1451964216_1456023873.pdf

My take from years of using a very large number of TCP accelerators across satellite
links is that:

- the performance benefits from the local file/stream/chunk/'object' rapid fetch
from Internet side and cached delivery that they offer for the satellite link
will far outweigh benefits of network coding across the path and its virtual
'erasure channel' for responsiveness, but that's hard to see from a throughput
graph.


- the over-satellite-link FEC feature offered is rarely that useful in practice,
as channel coding makes it largely redundant. If the PEP accelerator FEC becomes

useful, the channel coding needs to be adjusted for the SNR, and that's often

a local ACM problem, e.g. heavy rain fade at Ka-band, which the O3b example used
in the paper suffers from.

- there's a whole bunch of tuning of traffic for the offered satellite link
capacity (QoS, prioritisation, shaping, etc) brought to the table by PEPs
that network coding cannot consider. Sometimes this gets called 'Orchestration',
though that means different things to different communities.


oh, draft typo: writting->writing. Haven't had the time to reread
and think about the whole draft revision yet.

L.

Lloyd Wood lloyd.wood@yahoo.co.uk http://about.me/lloydwood



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