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Re: [dtn-users] FEC in DTN

"Ivancic, William D. (GRC-RHN0)" <william.d.ivancic@nasa.gov> Wed, 15 January 2014 17:53 UTC

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From: "Ivancic, William D. (GRC-RHN0)" <william.d.ivancic@nasa.gov>
To: James Jones <james@telixnet.com>, "dtn-users@irtf.org" <dtn-users@irtf.org>
Thread-Topic: [dtn-users] FEC in DTN
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Date: Wed, 15 Jan 2014 17:52:48 +0000
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Subject: Re: [dtn-users] FEC in DTN
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FEC and DTN has many connotations.  Perhaps you might specify  where you want the FEC.

Basically FEC on the point-to-point link between DTN forwarding agents is a transport thing.

FEC  or rather erasure codes somewhere in the Application/DTN chain is a bit of a different animal.  Look at some of the BBN proposals.
http://tools.ietf.org/html/draft-irtf-dtnrg-zinky-erasure-coding-extension-00
http://tools.ietf.org/html/draft-irtf-dtnrg-zinky-erasure-coding-objects-00
Here is a presentation:
http://www.ietf.org/proceedings/81/slides/DTNRG-2.pdf


Most DTNs you will probably find information on have been run over IP simply because it is the easiest to start and DTN is a network overlay.  NASA JPL has run DTN over, I believe, CCSDS space links.  The DARPA program BBN Spindle implementation ran IP over DTN with, I believe,  DTN mapped to the radio MAC.  (Others, feel free to add or correct these statements.)

Cheers,

Will

From: James Jones <james@telixnet.com<mailto:james@telixnet.com>>
Date: Wednesday, January 15, 2014 11:45 AM
To: "dtn-users@irtf.org<mailto:dtn-users@irtf.org>" <dtn-users@irtf.org<mailto:dtn-users@irtf.org>>
Subject: [dtn-users] FEC in DTN

Greetings,

I am still quite new to this list and DTN. I had a few really quick questions:


  1.  What is currently being used for FEC (Forward Error Correction), if any?
  2.  If there is already work being done is there anyway to do testing against vs a different FEC method?
  3.  Is most DTNs IP based?

-James

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