[Sis-dtn] New Draft: COMPRESSED CUSTODY SIGNALING AND BUNDLE STATUS REPORTING

[Sipos, Brian J.]

Felix,

Thanks for consideration of my earlier suggestion. I think the definition of
Bundle Sequence Range in Sec 3.3 is consistent and understandable.

 

There is one possible compression, saving one byte, in the case where the
array would have a single uint item it can be substituted with the uint
itself. It doesn't affect the information model being encoded, but does add
a small coding / decoding overhead to apply the compression. So it's
completely optional if you think there is that much value in one byte. (This
compressed form would also degenerate to your earlier form of start + length
if there are no excluded intervals)

 

Put in CDDL, the `seq-range` would include the following (with rule `eid`
taken from RFC 9171 appendix)

 

seq = [

  seq-id: uint / eid,

  seq-start: uint,

  seq-range,

  ? blk-source: eid

]

seq-range = [ seq-incl-len, + ( seq-excl-len, seq-incl-len) ] / seq-incl-len

seq-incl-len = uint .gt 0 ; inclusive length

seq-excl-len = uint .gt 0 ; exclusive length

 

 

From: SIS-DTN <sis-dtn-bounces at mailman.ccsds.org> On Behalf Of Felix Flentge
via SIS-DTN
Sent: Wednesday, May 14, 2025 9:11 AM
To: Dr. Keith L Scott via SIS-DTN <sis-dtn at mailman.ccsds.org>
Cc: Juan A. Fraire <juan.fraire at inria.fr>; Alice Le Bihan
<alice.le-bihan at insa-lyon.fr>; Jeck, Yanik <yanik.jeck at cgi.com>; Kramp,
Paul-Niklas <paul-niklas.kramp at cgi.com>
Subject: [EXT] [Sis-dtn] New Draft: COMPRESSED CUSTODY SIGNALING AND BUNDLE
STATUS REPORTING

 


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Hi,

 

I have just uploaded Draft H of the 'Compressed Custody Signaling And Bundle
Status Reporting' Orange Book to CWE:

 

 
<https://spacecomm.sharepoint.com/:w:/r/sites/SIS/_layouts/15/Doc.aspx?sourc
edoc=%7B10790F7B-6318-4BD0-9D53-8813C83BE941%7D&file=CompressedBundleStatusR
eportingAndCustodySignaling_OrangeBook_Draft_H.docx&action=default&mobilered
irect=true>
CompressedBundleStatusReportingAndCustodySignaling_OrangeBook_Draft_H.docx

 

We have introduced the following changes:

 

1.	Based on Brian's proposal to make the reporting even more efficient,
Yanik analysed and designed a new way to encode bundle sequences which may
contain some gaps (see updated Section 3.3). It is not so easy to come up
with some concise language for that, so please let us know if you have
suggestions for improvement.

 

2.	I took the opportunity to not allow processing of the CREB/CTEB
blocks in fragments:

3.4.1        Extension Blocks specified in this specification shall only be
added and processed in non-fragmented bundles.

 

NOTE - As later fragmentation of bundles using the extension blocks
specified in this specification may lead to unintended effects such as loss
of expected reporting or custody signals as fragmented bundles are never
re-assembled (RfC 9171 does only specify Application Data Unit Re-Assembly),
it is recommended to set the 'Bundle Must Not be Fragmented' flag at the
source if the application of custody transfer or compressed status reporting
according to this specification is intended.       

3.	The compressed reporting signal (see 5.2.3) has been changed to
include the reporting reason code as integer (and not as an integer
interpreted as bit field). Please note that the Status Report Request Flags
(5.1.4.1) shall actually be processed as a bit field. However, we align the
Bit Number with the reason code integer for consistency. 

 

Regards,

Felix

 

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