[Sis-mia] FW: [Cesg-all] Results of CESG Polls closing 11 November 2022

[Tomaso.deCola at dlr.de]

Hi Rodney,

The CESG poll for the DTN-RTP blue book has concluded that a few conditions have to be satisfied before proceeding with publication. They are summarised here below. 
In my opinion, those from Ignacio, Eric, and Jonathan can be easily addressed by fixing the text where need and providing clarifications (this especially is the case for Jonathan point about the test configurations, which in my opinion is out of scope for RTP interoperability tests). Concerning the Peter's comments, they are instead much more substantial and we have to decide to how to target them.

Regards,

Tomaso

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CESG E-Poll Identifier:  CESG-P-2022-10-006 
Approval to publish CCSDS 766.3-B-1, 
Specification for RTP as Transport for Audio and 
Video over DTN (Blue Book, Issue 1)

Results of CESG poll beginning 28 October 2022 and ending 11 November 2022:

                 Abstain:  0 (0%)
Approve Unconditionally:  2 (33.33%) (Merri, Cola)
Approve with Conditions:  4 (66.67%) (Barkley, Shames, Aguilar Sanchez, Wilmot)
Disapprove with Comment:  0 (0%)

CONDITIONS/COMMENTS:

     Erik Barkley (Approve with Conditions):  A couple of  conditions:

1)  Minor editorial comment, but I think somewhat 
important - section 1.2, change "proposed" to 
"recommended" in "...This document provides an 
overview and proposed methods for transmission of video over DTN using RTP"
2) Figure 2-4, please correct "RTC 3550" to read 
"RFC 3550" -- rationale, both RTP and RTCP are defined in RFC 3550.

     Peter Shames (Approve with 
Conditions):   While this document should be very 
useful for that class of missions that requires 
the support of video over RTP over BP, the 
document, as written, is rather casual in form 
and does not conform to the usual CCSDS norms for 
Utilization Profile or Adaptation Profile style 
of Blue Books.  It is certainly "Blue-ish" in 
nature, but needs to be edited and tightened 
up.  It reads rather more like an agency research paper than a CCSDS Blue Book.

For examples of what I would have expected to see 
in terms of clear presentation of protocol 
stacks, PDU & end to end diagrams, etc please 
review IP Over CCSDS, 702.1-B-1.  Some of the 
text and figures, such as sec 2.5.3 and fig 2-10, 
mix protocol and implementation details.  This is not a CCSDS norm.
I recommend that you look at the SCCS-ARD, CCSDS 
901.1-M-1, which is, in fact, referenced in the 
test report, but not here, for some end-to-end 
and protocol stack examples.  You are, in 
essence, layering this on top of DTN, but these 
will give you some protocol stack and deployments 
examples to follow for clarity.  Also think about 
what support might be needed in relay nodes, 
ground stations, and other nodes along the way to 
support these high rate flows.

There are a number of standards mentioned in Sec 
3 that do not appear in the references (SDP, 
RTCP, SBS/PPS, H264, MPEG, MIME, and BPV7 (to 
pair with BPSec).  As noted by Wilmot, the ICS is 
rather abbreviated in nature compared to the details in the text itself.

Finally, I believe that the provisioning of such 
video services, both in space nodes and in ground 
systems, deserves creation of the relevant 
entries in the SANA Service Site and Aperture and 
Roles registries.  See also recent discussions in 
the DTN WG about DTN registries.

     Ignacio Aguilar Sanchez (Approve with 
Conditions):  1. Simplify section 2 Overview. 
Move and expand, if need be, selected topics in an accompanying Green Book.

2. Introduce managed information as for instance 
done in Annex F of the Bundle Protocol BB.

     Jonathan Wilmot (Approve with 
Conditions):  1) Some optional features do not 
have documented interoperability tests per CCSDS 
A02.1-Y-4 "in cases in which one or more options 
or features have not been demonstrated in at 
least two interoperable prototypes or 
implementations, the specification may advance to 
the CCSDS Recommended Standard level only if 
those options or features are removed;"

2)  Tests should include a range of delays, 
disruption durations, and out-of-order packets to 
simulate space use cases.  If the standard only 
applies to near earth scenarios,  then that should be stated.


Total Respondents:  6

All Areas responded to this question.



SECRETARIAT INTERPRETATION OF RESULTS:  Approved with Conditions
PROPOSED SECRETARIAT ACTION:            Generate 
CMC poll after conditions have been addressed

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-----Original Message-----
From: CESG-All <cesg-all-bounces at mailman.ccsds.org> On Behalf Of CCSDS Secretariat via CESG-All
Sent: Montag, 14. November 2022 17:40
To: cesg-all at mailman.ccsds.org
Subject: [Cesg-all] Results of CESG Polls closing 11 November 2022