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Re: Chang'E 3

2013-12-27 00:02:23
So if TCP has problems then MPTCP has problems then they may not be
preferred for that satellite networking. For LEO SATNETs also there are
problems for using TCP. The UDP is a good solution in general but not
efficient, but always I think the SATNETs may need some special
internet transport protocols because they are having more dynamics in the
net's lower layers.

AB

On Friday, December 27, 2013, wrote:

TCP won't work well from the Moon to Earth - slow start, congestion
backoff as a reaction to lost/errored frames, makes for inefficient use of
the space link. (And TCP may be a larger codebase than you want on an
embedded system running on a constrained radhard processor)

We explored TCP's distance limitations in

http://personal.ee.surrey.ac.uk/Personal/L.Wood/publications/index.html#protocol-radius
Lloyd Wood, Cathryn Peoples, Gerard Parr, Bryan Scotney, Adrian Moore,
TCP's protocol radius: the distance where timers prevent communication,
Proceedings of the International Workshop on Space and Satellite
Communications (IWSSC '07), Salzburg, Austria, 13-14 September 2007, pp.
163-167.

AFAIK vanilla ftp/TCP has (only?) been used on CHIPsat from LEO, but that
did not have much data to transfer.

We designed http://saratoga.sf.net with the idea of a continuous UDP
stream of data from Pluto in mind...

Lloyd Wood
http://sat-net.com/L.Wood/


________________________________________
From: ietf [ietf-bounces(_at_)ietf(_dot_)org <javascript:;>] On Behalf Of 
Abdussalam
Baryun [abdussalambaryun(_at_)gmail(_dot_)com <javascript:;>]
Sent: 26 December 2013 16:40
To: Michael Richardson
Cc: ietf(_at_)ietf(_dot_)org <javascript:;>
Subject: Chang'E 3

Transport protocol for satellites depend on the applications, the network
dynamics, links and transmission channels. IMO the use of MPTCP for
Back2Earth may not be the best option making the communication complex, not
sure why did you hope to use it with this project.

AB

On Sunday, December 15, 2013, Michael Richardson wrote:

The rover landing is rather exciting.
I'm wondering what the communication(s) protocol back to earth is.

(I'm hoping the answer will be MPTCP over IPv6 w/IPsec... )

--
Michael Richardson <mcr+IETF(_at_)sandelman(_dot_)ca <javascript:;>>, 
Sandelman
Software Works
 -= IPv6 IoT consulting for hire =-


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