Re: [dtn-interest] Re : Re: Question

Hi Sitaraman

Thanks for your interest. We are currently working on these aspects for deep space communication on top of a DTN architecture with CNES (the French space agency).
In particular, we seek to integrate erasure coding inside the DTN architecture.
Note that there is also an IETF draft on this subject : http://www.ietf.org/id/draft-zinky-dtnrg-erasure-coding-objects-00.txt

Emmanuel

On 31/01/2013 02:34, sitaraman@nmsworks.co.in wrote:
> I should rather say "in addition to" instead of "as opposed to" in the below
>> Hi Emmanuel,
>>   This looks great to me, thanks for this pointer. Only one scenario comes
>> to mind, if it so happens that the expected bundle loss rate, even if for
>> brief periods, is underestimated. Such scenarios could perhaps be
>> relevant in space as intense disturbances for brief period is more likely
>> than a steady noise, and with Tetrys, it would be inefficient to have the
>> expected bundle loss rate set at its peak.
>>   I am tending to think while Tetrys could be a default scheme running in
>> the DTN, DSN, there is needed a scheme that can put out fires
>> occasionally?
>> Sitaraman
>>> Hi Sitaraman
>>>
>>>> Thanks much for this pointer, it will help me learn this aspect.
>>>> In general a question remains that i have, for the group as  whole.
>>>> A lot seems to have already been done  and literature and code
>>>> available
>>>> in FEC and Erasure Codes as has been made available from  the
>>>> discussion
>>>> on this group  Do these complement or can they replace loss (chunks
>>>> of
>>>> data compeletely lost so that there is not anything to decode from)
>>>> handling mechansims?
>>> Concerning this point, you'll find a study that uses such scheme to
>>> rebuild lost chunks in "Robust streaming in delay tolerant networks":
>>> see http://oatao.univ-toulouse.fr/4111/
>>> The erasure coding scheme is a specific elastic-window encoding scheme
>>> named Tetrys: see http://websites.isae.fr/tetrys/
>>>
>>> Emmanuel
>>>
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>
>

-- 
Emmanuel Lochin
Professeur ISAE - OSSI
Institut Supérieur de l'Aéronautique et de l'Espace (ISAE)
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