[Sls-rfm] Fw: CCSDS RFM WG Spring meeting - comments received on DDOR inputs - status as of 6 April - C&S proposal

[Enrico.Vassallo at esa.int]

Dear All,

I have not received any negative comments concerning the suggested way 
forward from April 6, which is therefore agreed by both RFM and DDOR WGs.

Meanwhile, C&S WG discussed CS_20-03 and tentatively (minutes are still 
draft) agreed on the following action:
SLS-CS_20-03(PN shift registers, NASA)
NASA presented a proposal for the unification of the representation of the 
polynomial and diagrams representing PN shift registers in different CCSDS 
books (affecting also other WGs, e.g. RFM)
AI_20_04 was given to the WG to report about the proposal, the possible 
need to have a similar standard representation and, in case, the preferred 
way forward. September was set as deadline for the action.

I would suggest that we also agree on a similar action for the RFM WG with 
the same deadline. September would be compatible with the DDOR 
recommendation(s) agency review cycle.

If I do not hear from you otherwise by Friday, I will enter such action in 
the draft minutes of the meeting held by correspondence.

Incidentally, I would like to alert Greg that the SLP group should have a 
look at this NASA's input since it also proposes changes to 732.0-B-3  and 
732.1-B-1, which I believe are under SLP WG purview. I attached the input 
again for SLP convenience.

Regards, Enrico




----- Forwarded by Enrico Vassallo/esoc/ESA on 19/05/20 11:34 -----

From:   Enrico Vassallo/esoc/ESA
To:     sls-rfm at mailman.ccsds.org
Cc:     "Border, James S (US 335D)" <james.s.border at jpl.nasa.gov>, "Volk, 
Christopher P (US 335D)" <christopher.p.volk at jpl.nasa.gov>
Date:   06/05/20 10:46
Subject:        CCSDS RFM WG Spring meeting - comments received on DDOR 
inputs - status as of 6 April


Dear All,

for what concerns the DDOR input papers (dealing with REC 2.5.7B) to be 
discussed at the Spring meeting, the following four sets of comments plus 
one full input document (SLS-RFM_20-03) were submitted:

1. Comments by Wai on adding predistortion in considerings and recommends 
2. Comments by Enrico on several recommends 
3. Comments by Shannon and Victor on PN terminology (subset of doc 
CS_20-03) 
4. Comments by Andrea and Giovanni on several considerings and recommends 
5. ESA input paper SLS-RFM_20-03 on 2 dB vs 1 dB flatness, flexibility on 
chip rates, subcarrier frequencies, roll-off factors,  definition of SRRC 
shaping 

I have agreed with DDOR chair (Jim) the following course of actions:

A) Prepare and submit a detailed response to all raised issues
B) Prepare and submit the resulting revised version of REC 2.5.7B (and 
2.5.6B if alignment needed) 

The DDOR WG is trying to finalize tasks A and B. Jim with Christopher and 
myself with Dennis already exchanged several emails on this, and assuming 
we can reach agreement on 2, these tasks may be completed this week.
I would then give the RFM WG two weeks to make sure we all agree with the 
proposed changes and that the authors of the comments are satisfied by the 
responses.
After that, I will initiate agency review of 2.5.7B along with the other 
recommendations (as applicable) on freeze since the Fall 2019 meeting.

There is a catch though. Comments raised by 3 concern several other 
recommendations and books, some under C&S WG and two under SLP WG. It 
would be wise to study the proposal also from an overall impact point of 
view and take a global SLS area decision at the next face-to-face meeting 
in Toulouse.
With the normal CCSDS timeline, the agency review of 2.5.7B will most 
likely terminate shortly before the Toulouse meeting where RIDs 
disposition will take place. I propose that we consider the changes 
stemming from discussion of input 3, if any, as editorials so that we can 
insert them in Toulouse before sending the recommendation out for 
publication.

I noted that the C&S WG chair recommended the same path for item 3 and 
that also DDOR WG chair agreed to this.

Please let me know if you have problems with the proposed way forward.

Regards, Enrico


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