[SOIS-WIR] SFCG-40 outputs concerning lunar and martian wireless frequencies

[Kevin K Gifford]

Dear Jean-Luc -

The CCSDS-883 issue is not at the SOIS-WG level, it is at the CESG level.

In response to your comments, please note that all agreed-to RIDs from ESA/CNES from the CESG Review have been excepted, sans one confusing sentence whose content was redundant, so I fail to your concerns.

Regarding the proposed green book updates draft document, that is totally out of scope, it is an old draft document.

Let me repeat: CCSDS-883 processing is at the CESG level and the SOIS-WIR WG will await the outcome of this process.

Thanks.

Kevin
________________________________
From: SOIS-WIR <sois-wir-bounces at mailman.ccsds.org> on behalf of Issler Jean-Luc <Jean-Luc.Issler at cnes.fr>
Sent: Sunday, December 26, 2021 2:23 AM
To: sois-wir at mailman.ccsds.org <sois-wir at mailman.ccsds.org>
Subject: [SOIS-WIR] SFCG-40 outputs concerning lunar and martian wireless frequencies


Dear Kevin, dear all,



I hope you have had a nice Christmas



As a member of CCSDS SOIS/Wireless and SLS/RFM group, I have seen the 883 version that you submited to RFM for comments. This version do not present significant progress to re-find the consensus that you declared Kevin, and which was later broken. I made new proposals (included in the combined version of 883 containing the comments received from RFM WG before the deadline that you have defined Kevin) to find new compromises in the 883 text, while keeping in mind the key issues allowing to re-create the declared consensus.



Please also find here attached the updated SFCG recommandations (for the ones who have not them aready) to respect vis a vis lunar and martian communication/PNT frequencies. New lunar and martian wireless bands have been introduced, with some necessary restrictions, as well as recommendations to protect the 2483-2500 MHz PNT orbit to surface lunar band. The need of an upper guard band that we have discussed before reaching our consensus including that need at WG Level (now broken by SEA/AD PIDS and the resulting version submited to RFM), between 2.5000 and 2.5035 GHz, has been discussed, confirmed and included in the updated SFCG RECs . The 3GPP 4G 2.5 GHZ lunar and martian bands are therefore 2503.5-2620.0 MHz. SFCG confirmed also the Wifi 2.4 GHz lunar and martian bands: 2400.0-2480.0 MHz, that is not any channel, even partly spectraly speaking, above 2480.0 MHz. CNES hopes that the published 883 version will be clear in fully respecting these SFCG bands and in fully protecting the 2483.5-2500 MHz SFCG band. We know that there is not any CCSDS written rules, or even clear usage, precluding 883 to be unambiguous on this. Moreover, without this few frequency references allowing to re-create the consensus, the 883 version submited to RFM contains more than 150 frequency references in MHz or GHz ! SFCG also did not introduced new wireless bands which could threaten Radio Astronomy in the Shielded Zone of the Moon.



CNES was among the few agencies having been in favour of introduction of both 2.5 GHz and 5 GHz wireless bands in these updated SFCG recommendations !     SFCG is a continuous process, and CNES hopes that a compromise could be find for a future update to introduce a well studied portion of the 60 GHz wireless band acceptable for both Wireless and Radio Astronomy communities.



It is also very important that 883 re-become acceptable vis a vis the Protection of Radio Astronomy in the Shielded Zone of the Moon, as it was when you declared consensus and the related 883 agency review closure, Kevin; may be could you provide to our Wireless WG a status on 883 ?



I also had a look to the following Draft Recommendation for Space Data System Standards which is available in CWE (uploaded end of august): ”SOIS-Lunar Surface Communications Recommended Frequency Bands; Engineering technical recommendation; CCSDS 883.0-G-4; Proposed Green Book Updates. October 2021”. This document is also not compatible with the consensus which has been declared (and it is better than SFCG com, PNT and radar communities do not see the current version of this document !). I will have many comments, I will provide them asap, but I would recommend that we put on hold this document by waiting publication of 883, since the content of 883 is not approved if I am correct, notably due to the broken consensus. Once 883 will be hopefully published, we would have a stable reference to built upon to continue drafting this document.



Most importantly: nice end of year, and Happy New Year to you, your families and your nears.



Very best regards



Jean-Luc
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ccsds.org/pipermail/sois-wir/attachments/20211227/88936149/attachment.htm>