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<p class="MsoNormal">Dear CCSDS ”Special topic” Colleagues,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Today we held a special Working Meeting to discuss some issues that came up in the context of the SCCS-ARD, specifically the forward / return file service and how we can understand (and document) both what was requested of CCSDS by the
IOAG and what has currently been proposed. What follows are the <b><i>DRAFT</i></b> set of minutes for that meeting. Your feedback, edits, and corrections are solicited. By CoB, Friday, 22 Jan 21 please.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Attendees: Keith Scott, Costin Radulescu, Colin Haddow, Ramon Krosley, Greg Kazz, Jonathan Wilmot, Holger Dreihahn, Gian Paolo Calzolari, John Pietras, Yonghui Huang<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The discussion was wide-ranging and covered the following list of possible
<b><u>Options</u></b>:<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l4 level1 lfo3">CFDP deployed end-to-end, as intended in the CFDP standard, where the CFDP entity is in the MOC and the MOC communicates with the ESLT using standard SLE interfaces. The S/C implements
CFDP Class 1 or 2. This is an existing, documented, standardized, CCSDS deployment.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l4 level1 lfo3">The “original” IOAG proposal for a forward/return file service that involved transferring files from the User (EUN, MOC) to the ESLT ( ground station / comm complex) and having the
ESLT send them via a CFDP entity in the ESLT to the S/C (SUN). The general agreement is that there are many aspects of this that are vague and ill-specified. The S/C implements CFDP Class 1 or 2. See Colin’s diagram. The intent in CCSDS has been to use
TGFT for the file transport between the user MOC and the ESLT. There is not yet a spec for the TGFT meta-data nor for the ESLT processing that is required.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l4 level1 lfo3">There is also an IOAG fwd/ret “Packet” service that was not really discussed.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l4 level1 lfo3">A variant of “standard” CFDP, option 1, as proposed by ESA only for
<u>downlink</u> optimization, that deploys CFDP in the MOC (EUN), and potentially in a separate MOC “control node”, that uses standard SLE interfaces for transport of command and telemetry frames, but that also adds a new CFDP buffering and management feature
in the ESLT that examines arriving frames, looks for the CFDP PDUs in the selected virtual channels, identified missing PDUs, send notices of the missing data to the “CFDP Control node” which generates retransmission requests, and send the full CFDP PDU set,
more slowly, to the full CFDP node in the MOC. The S/C implements CFDP Class 1 or 2. See Holger’s diagram.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l4 level1 lfo3">A variant of the “ESA downlink optimizer”, option 4, that also supports downlink returns from low Earth S/C using multiple ESLTs and aggregates and synchronizes all of the data in
the “full CFDP node” in the MOC. There appears to be even another variant of this for the use case where the file data is sent not to the S/C MOC but to a separate instrument MOC. The S/C implements CFDP Class 1 or 2. See Holger’s diagram, with mods.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l4 level1 lfo3">The DTN case, using CFDP Class 1 or Class 2 over DTN to provide all of the end-to-end reliability, routing, store & forward, and data delivery processing. The S/C implements CFDP Class
1 or 2 over DTN. The ESLT implements DTN (with the FF-CSTS and frame merging options) and the MOC implement CFDP Class 1 or 2 over DTN. This is an existing, documented, standardized, CCSDS deployment.<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There were some items that everyone present could agree upon:<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo4"><b><u>Options</u></b> 1 and 6 are what is currently documented and standardized.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo4">Everyone agreed that the desired end-point for CCSDS standardization, and for mission deployment is DTN and CFDP (or other protocols) running over that.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo4">Everyone agreed that for DTN deployments there will still need to be what was called “essential command, telemetry, and radiometric” communications, that these would continue to use
SLE & CSTS for cross support, and that the new, not yet standardized, Last Hop and First Hop services are an essential part of these deployments.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo4">Everyone agreed that
<b><u>option</u></b> 2, the IOAG proposal is accurately reflected in Colin’s original diagram.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo4">Everyone agreed that the
<b><u>option</u></b> 2 diagram leaves a lot of room for interpretation.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo4">Everyone agreed that we should return to the IOAG and ask for the needed clarification (or provide that and ask if they concur).<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Other <b><u>observations</u></b> where there was general agreement, but possibly not full concurrence (TBD).<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo5">It has been noted that many missions (MOC) still want to control, at a micro level, everything that is sent on the command link to their spacecraft. This means that
<b><u>option</u></b> 1 can be acceptable, but that <b><u>option</u></b> 2 often gets “push-back”. And this is one of the strong motivations for
<b><u>options</u></b> 4 & 5.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo5">There is general agreement that there are many aspects of
<b><u>option</u></b> 2 that are vague and ill-specified. It seems clear that the fwd/ret file service, the meta-data, and the ESLT processing functions must be more clearly specified.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo5">There is general agreement that some sort of more explicit concept diagrams, such as were provided for the IOAG SISG first hop/last hop service, are needed to really document, even
conceptually, what is required for any of these new services.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo5">There is a broad understanding that for a class of low Earth missions, with short passes, and limited terrestrial bandwidth relative to high rate downlinks, that ACK/NAK traffic should
be prioritized relative to bulk data. This, and mission control of the uplink (<b><u>observation</u></b> 1) leads to the motivations for
<b><u>options</u></b> 4 & 5.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo5">There is a strong concern that having CCSDS adopt and standardize any of these more exotic “CFDP variants” or “file services” may have the effect of de-legitimizing DTN in the eyes
of potential users and of further slowing adoption of DTN. <o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo5">None of these options, except DTN, provides a networking service, all are “hacks” to provide variations on ABA file delivery.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo5"><b><i>NOTE: It occurs to me that, in addition to protocol stacks, one way to approach any of this functional specification is to attempt to use a Functional Resource Model (FRM)
style approach to document which functions are executed and where they are deployed. This should also help flush out any new, required, functions that are not yet specified in the FRM.<o:p></o:p></i></b></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Other general observations for further discussion:<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo6">ESA has prototyped an “<b><u>option</u></b> 4 (&5)” approach for low Earth orbit missions with high rate downlinks.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo6">The DSN has an operational “<b><u>option</u></b> 4” approach that is documented and in use for some missions.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo6">Some missions are operating in “<b><u>option</u></b> 1” configurations now, with reliable CFDP for downlink and now some uplink.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo6">The ESA approach, and the DSN approach for that matter, could each be documented as Orange Books. These still involve a lot of the CCSDS machinery and may not be the best strategic
choice for CCSDS to adopt.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo6">Even the IOAG requested
<b><u>Option</u></b> 2 is questionable, for the same reasons. Developing this new protocol takes resources and there may not actually be users for it given
<b><u>Observation</u></b> 1 & 2.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo6">The IOAG is not really
<b><i>the</i></b> source of requirements for CCSDS. It is one of the stakeholders, which also include broader agency requirements, space missions, infrastructure providers, space data user organizations, and CCSDS internally generated requirements. The IOAG
is stated to be “<span style="font-size:12.0pt;font-family:"TimesNewRomanPSMT",serif">to be a very important source of multiagency cross-support requirements</span>”, but it is not the only one.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo6">We do not know which missions want any of these options.<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Future work:<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo7">Provide revised versions of these potential approaches for review<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo7">Review them within CCSDS and then with the IOAG (TBD)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo7">Reach some agreement within CCSDS on what strategic choices we wish to make and which of these approaches, if any, should get CCSDS resources<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Once I have your feedback items I’ll incorporate them and send out a final set of minutes to the rest of the invitees and the full CESG.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks, Peter<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">SEA-SA <sea-sa-bounces@mailman.ccsds.org> on behalf of SEA-SA <sea-sa@mailman.ccsds.org><br>
<b>Reply-To: </b>Peter Shames <peter.m.shames@jpl.nasa.gov><br>
<b>Date: </b>Tuesday, January 12, 2021 at 5:33 PM<br>
<b>To: </b>Erik Barkley <erik.j.barkley@jpl.nasa.gov>, Gian Paolo Calzolari <Gian.Paolo.Calzolari@esa.int>, Gilles Moury <Gilles.Moury@cnes.fr>, Greg Kazz <greg.j.kazz@jpl.nasa.gov>, "Wilmot, Jonathan J. (GSFC-5820)" <jonathan.j.wilmot@nasa.gov>, Klaus-Juergen
Schulz <Klaus-Juergen.Schulz@esa.int>, Keith Scott <kscott@mitre.org>, Marc Sanchez Net <marc.sanchez.net@jpl.nasa.gov>, "Margherita.di.Giulio@esa.int" <Margherita.di.Giulio@esa.int>, Scott Burleigh <scott.c.burleigh@jpl.nasa.gov>, SEA-SA <sea-sa@mailman.ccsds.org><br>
<b>Subject: </b>[EXTERNAL] [Sea-sa] Special Working Meeting: SCCS-ARD discussion - fwd/ret file service<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">This special working meeting is to explore a set of issues that have just some up in the process of tackling the updates to the Space Communication Cross Support (SCCS) Architecture documents (ARD
/ ADD), the SCCS-ARD, CCSDS 901.1-M-1. </span><span style="color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Missions may use (and ESLTs may implement) a forward and return “file service”, that uses TGFT to transfer files from the EUN to the ESLT, along with a CFDP “agent” in the ESLT that does the actual
file delivery transfer, using CFDP, over the space link to the Space User Node (SUN, otherwise known as the spacecraft).</span><span style="color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">This is some sort of “cross support protocol” that belongs in the CSS Area, whether it is in the CSTS WG or the SM WG. That said, it may also require some sort of “control report” interface to
be spliced into the CFDP protocol agent to allow the EUN to be signaled about intermediate CFDP protocol status, along with some sort of “control interface” that will allow the CFDP agent, in the ESLT, to be controlled from the EUN. And there also must be
some means for the EUN to tell the CFDP agent in the ESLT just how to turn that file into CFDP PDUs, link layer PDUs, encapsulate them, and how to merge them into the uplink traffic flow.</span><span style="color:black">
</span> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">There is some real work to be done if we are to create a Forward / Return File Service spec that it truly interoperable and has all these special, and unusual, properties. There is also the related
question of whether this rather narrow standard is a good use of CCSDS resources instead of adopting CFDP over DTN, which has broader applicability and already would provide the same functionality, and much more. </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">We do not think we can do this in the SEA SAWG, this is work that must be done in the other Areas that “own” the respective sets of standards. At the same time we see some potential for leveraging
work in different areas and integrating it to provide a more unified end-to-end approach, and that is our express goal as we try to help sort this out.</span><span style="color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:black">Proposed agenda: </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:black">CSS Position on the service </span><o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l2 level1 lfo1">
ESLT architecture <o:p></o:p></li><li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l2 level1 lfo1">
CFDP agent integration in the ESLT <o:p></o:p></li><li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l2 level1 lfo1">
CFDP signaling changes <o:p></o:p></li><li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l2 level1 lfo1">
Split data delivery approach <o:p></o:p></li><li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l2 level1 lfo1">
Fwd / ret signaling approach <o:p></o:p></li><li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l2 level1 lfo1">
ESLT control approach for configuring and managing creation / processing of CFDP, encap, frame creation, encode/decode in the ELST <o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:black">SIS Position on the service </span><o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l6 level1 lfo2">
ESLT architecture <o:p></o:p></li><li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l6 level1 lfo2">
DTN agent integration in the ESLT <o:p></o:p></li><li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l6 level1 lfo2">
Split data delivery approach <o:p></o:p></li><li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l6 level1 lfo2">
Fwd / ret signaling approach (if needed) <o:p></o:p></li><li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l6 level1 lfo2">
ESLT control approach for configuring and managing creation / processing of DTN bundles, encap, frame creation, encode/decode in the ELST <o:p></o:p></li><li class="MsoListParagraph" style="color:black;margin-left:0in;mso-list:l6 level1 lfo2">
CFDP end-to-end flow <o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:black">Discussion </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:black">Thanks, Peter </span><o:p></o:p></p>
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<p class="MsoNormal" style="line-height:15.0pt"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#4D4D4D">SCCS-ARD discussion - fwd/ret file service</span></b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#4D4D4D"> </span><o:p></o:p></p>
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