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Re: [nwcrg] Spencer Dawkins' Yes on draft-irtf-nwcrg-network-coding-satellites-13: (with COMMENT)

Kuhn Nicolas <Nicolas.Kuhn@cnes.fr> Fri, 29 May 2020 09:37 UTC

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From: Kuhn Nicolas <Nicolas.Kuhn@cnes.fr>
To: 'Carsten Bormann' <cabo@tzi.org>, "lloyd.wood@yahoo.co.uk" <lloyd.wood=40yahoo.co.uk@dmarc.ietf.org>
CC: "nwcrg@irtf.org" <nwcrg@irtf.org>, Spencer Dawkins <spencerdawkins.ietf@gmail.com>, "Stuart W. Card" <stu.card@critical.com>
Thread-Topic: [nwcrg] Spencer Dawkins' Yes on draft-irtf-nwcrg-network-coding-satellites-13: (with COMMENT)
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Date: Fri, 29 May 2020 09:37:32 +0000
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Subject: Re: [nwcrg] Spencer Dawkins' Yes on draft-irtf-nwcrg-network-coding-satellites-13: (with COMMENT)
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Thank you all for your comments and this discussion. 
We are working on an updated version of the draft. 
In the meantime, I wanted to comment on this.
See inline

Nico
-----Message d'origine-----
De : nwcrg <nwcrg-bounces@irtf.org> De la part de Carsten Bormann
Envoyé : dimanche 24 mai 2020 00:37
À : lloyd.wood@yahoo.co.uk <lloyd.wood=40yahoo.co.uk@dmarc.ietf.org>
Cc : nwcrg@irtf.org; Spencer Dawkins <spencerdawkins.ietf@gmail.com>; Stuart W. Card <stu.card@critical.com>
Objet : Re: [nwcrg] Spencer Dawkins' Yes on draft-irtf-nwcrg-network-coding-satellites-13: (with COMMENT)


> On 2020-05-24, at 00:14, lloyd.wood@yahoo.co.uk <lloyd.wood=40yahoo.co.uk@dmarc.ietf.org> wrote:
> 
> I doubt that
> network coding across a path including a satellite link can beat the 
> coding and modulation that can be dynamically applied to the satellite 
> link.

[NK] There are cases where there are residual errors - such as mentioned in the section 3.5 of the draft. In mobile users cases or when you use optical links, the physical layer coding and modulation schemes may not be adequate and the residual errors are very impacting on GEO use-cases. 

Very likely so.  But the keyword is “can be applied”.  Is it?
When is the clunky sat terminal written off and up for renewal?

This is the (not so unlikely) situation where LOOPS-style in-network recovery can be useful even for satellite losses.

Grüße, Carsten

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