[Sis-mia] Updates and Actions

[Grubbs, Rodney P. (MSFC-HP27)]

All—it was so good to see some of you in person again. Three years was a long time in between face-to-face meetings.

We had productive meetings in Toulouse. We agreed to pursue a project, starting with a Green Book, that will lead to a Video Quality Specification. The Green Book will be based on DLR/Falk Schiffner’s White Paper. I have submitted the Green Book project into the Framework and for CMC approval. Once approved I will set up a meeting to follow up on actions for writing the first draft.

Meanwhile, earlier this week we received CESG Approval (with conditions) for the publication of our Blue Book, Specification for RTP as Transport for Audio and Video over DTN). The conditions are at the bottom of this email. Next week I’ll begin the process of addressing these conditions and follow up with some of you for support.

While we only briefly discussed this during our in-person meetings, our original Green Book, Motion Imagery Applications, is well overdue for a refresh. I have entered this project into the Framework as well and submitted the project for CMC approval. Once approved I’ll set up a meeting for us to go over assignments for updating.

Please see conditions related to our RTP book below:

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


“Live Life Forward”
Rodney Grubbs
Artemis Imagery Integration Lead
Advanced Exploration Systems
256-603-3270 (NASA phone)
931-229-6030 (Personal, post-NASA phone)

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