[Sis-mia] Responding to CCSDS CESG "caveats" approval for RTP book

Mon Dec 5 16:07:23 UTC 2022

Need to give myself a 30 minute buffer due to a medical appointment Wednesday morning.

We need to discuss the caveats below. Please look these over prior to this meeting.

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.

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