[Sls-slp] Broadcast/Multicast in 235.1 - decision yet to be taken - resolve at SLS Plenary Today

[Stefano Petri]

Hello Greg,

I am sharing my thoughts here since I cannot attend the SLS plenary.

On the proposed workaround to manage the SCID with the report source SCID directive, now that we have a proposal for having both source and destination SCID in the TF header, couldn't we adopt instead this mechanism as a way of pushing for adoption of the proposed new USLP header?

About the conops of UIS, I believe there should be some extra thinking on how it will play out. Even if the user hails the relay, it may be more appropriate for the relay to maintain the role of master/caller of the session (since it is the relay that will have the knowledge of e.g. usage of the channels).

We would need this to be reviewed also by colleagues that are not participating in ccsds since this was added after the agency review.


Thank you

Best regards
Stefano



________________________________
From: KAZZ, GREG J. (MSFC-HP27)[MOSSI2] <greg.j.kazz at nasa.gov>
Sent: Friday, 23 October 2026 06:04:29
To: SLP_Mail_List <sls-slp at mailman.ccsds.org>; Clemens Heese <Clemens.Heese at esa.int>; Nicola Maturo <Nicola.Maturo at esa.int>; Andrews, Kenneth S (US 361A) <kenneth.s.andrews at jpl.nasa.gov>; Matt Cosby <matt.cosby at goonhilly.org>; Stefano Petri <Stefano.Petri at esa.int>; Andres, Brent (GSFC-567.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] <brent.r.andres at nasa.gov>; Issler Jean-Luc <jean-luc.issler at cnes.fr>; Lee, Dennis K (US 332G) <dennis.k.lee at jpl.nasa.gov>; Rodriguez, Shannon (GSFC-5670) <shannon.rodriguez-1 at nasa.gov>
Subject: Broadcast/Multicast in 235.1 - decision yet to be taken - resolve at SLS Plenary Today


Dear All,



We forgot to resolve one pending issue on 235.1, Broadcast/Multicast and UIS Hailing capability.



My recollection was that at the last telecon in early September, ESA said they wanted to think about it a bit more and bring it up for final discussion in Matera.

See Sections 5.1.4 Broadcast/Multicast Session Establishment and 5.1.5 User-Initiated Hailing in the attached draft 235.1 document. (Same as presented in teleconference in early September ).



So let’s try to resolve it in the SLS plenary or if we cannot due to time constraints schedule a telecon ASAP. I am optimistic that we can resolve today.



Thanks much,

Greg

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