[Sis-dtn] Notes from 20240410

[sburleig.sb at gmail.com]

Thanks, Keith.  Just one note of clarification in case there’s some confusion: the BIBE option would entail doing segmentation within BIBE itself (not in the BPA), a new BIBE feature not yet described in the draft BIBE spec.

 

Since BIBE is a convergence-layer protocol (that is, it is a protocol that accomplishes the transmission of a bundle – formed by the BPA – to a specified convergence-layer endpoint), this again devolves to the use of convergence-layer protocols to do bundle “fragmentation” and reassembly.  The big difference between BIBE and other CL protocols is that the BIBE PDUs are bundles, so the “fragments” can travel over different paths to the BIBE convergence-layer endpoint that does reassembly and passes the original bundle up to the BPA for forwarding or delivery.

 

Scott

 

From: SIS-DTN <sis-dtn-bounces at mailman.ccsds.org> On Behalf Of Keith Scott via SIS-DTN
Sent: Thursday, April 10, 2025 8:54 AM
To: sis-dtn at mailman.ccsds.org
Subject: [Sis-dtn] Notes from 20240410

 

SIS-DTN Telecom 20250410

 

Tomaso - CESG Meeting Yesterday

*	New technical editor won’t happen before the Spring Meeting (June)

*	All the books in queue won’t be processed before that time

*	Another telecom in 1 month

*	Orange BPv7 has been through review but it may be later until it can be published

 

Publish draft books to somewhere

---Put the BPv7 Orange book into a ‘draft books’ directory on CCSDS?

 

Fragmentation

Scott: just bail on fragmentation -- force it onto the convergence layer.

 

Condition: The entirety of every bundle must be able to go across one path to the destination.

 

If two fragments really need to go across different paths to the destination, use bundle-in-bundle encapsulation so that the original bundle gets reconstituted at the destination.

 

Brian: there are other things beyond size, things in service-level agreements in the networks.

 

Scott: could also use DTPC to segment larger bundles into smaller bundles for BP.

 

Three (and a half) ways to address this

*	Configure applications to send smaller ADUs (source)

*	Use something DTPC-like to segment large ADUs (source, could be added)

*	Use BIBE and do separate security on the encapsulating BIBE bundles (in network)

*	Where necessary / possible, use convergence layers that ‘span’ multiple contacts (segmentation/reassembly at the convergence layer across multiple contacts)

 

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