$)C<span style=" font-size:10pt;font-family:sans-serif">Thanks Cheol,</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">in general I would
see two approaches towards a 'tiny CFDP' </span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">1) define a minimum
set of mandatory features based on existing CFDP Class 1 and maintain full
(or backward compatible) compatibility on PDU level</span>
<br><span style=" font-size:10pt;font-family:sans-serif">(so no filestore
/ proxy operations, may be limited to small files, no segment metadata,
no record continuation, ...)</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">2) define a new
file transfer protocol for use in DTN: for BP we could put a whole file
+ metadata in a single bundle and would have BP deal with fragmentation
if necessary (however, IMHO we should try to avoid fragmentation as much
as possible); for LTP we might need to define a mechanism for segmentation
in case a file is larger the the maximum block size</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">I am wondering
how much we would simplify by doing 2) (in particular, if we would have
to handle segmentation). With 1) I see and advantage that we could easily
define first hop / last hop services for assets which implement CFDP but
not BP (which might be important during the transition period).</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">We will discuss
at the meeting. </span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Regards,</span>
<br><span style=" font-size:10pt;font-family:sans-serif">Felix</span>
<br>
<br>
<br>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
</span><span style=" font-size:9pt;font-family:sans-serif">"18C6H8"
<chkoo@kari.re.kr></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style=" font-size:9pt;font-family:sans-serif"><Felix.Flentge@esa.int></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Cc:
</span><span style=" font-size:9pt;font-family:sans-serif"><sis-cfdpv1@mailman.ccsds.org>,
<jpmayer@gmv.com></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
</span><span style=" font-size:9pt;font-family:sans-serif">11/05/2022
01:44</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style=" font-size:9pt;font-family:sans-serif">RE:
CCSDS CFDP WG Meeting 12 May / B5 Update Proposals</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent
by: </span><span style=" font-size:9pt;font-family:sans-serif">chkoo@kari.re.kr</span>
<br>
<hr noshade>
<br>
<br>
<br><span style=" font-size:12pt;font-family:sans-serif">Hi Felix,</span>
<br><span style=" font-size:12pt;font-family:sans-serif">I have put the
presentation material for topic 2 at the ccsds cwe website.</span>
<br><span style=" font-size:12pt;font-family:sans-serif">Please find it
from this </span><a href="https://cwe.ccsds.org/sis/docs/SIS-CFDPV1/Meeting%20Materials/2022/Spring/CCSDS_CFDPv1WG_lighterCFDP_KARI_May122022.pdf" target=_blank><span style=" font-size:12pt;color:blue;font-family:sans-serif"><u>link</u></span></a><span style=" font-size:12pt;font-family:sans-serif">.</span>
<br>
<br><span style=" font-size:12pt;color:#4f4f4f;font-family:sans-serif">Best,</span>
<br><span style=" font-size:12pt;color:#4f4f4f;font-family:sans-serif">Cheol</span>
<p style="margin-top:30px;y\",'i%'Cheole find it
from"><span style=" font-size:9pt;color:#0062e1;font-family:Arial"><b>---------
?x:; 8^@O ---------</b></span></p>
<br><span style=" font-size:9pt;font-family:Arial"><b>:83=;g6w</b>
: <Felix.Flentge@esa.int><b><br>
9^4B;g6w</b> : <sis-cfdpv1@mailman.ccsds.org>, <chkoo@kari.re.kr>,
<jpmayer@gmv.com><b><br>
9^@:3/B%</b> : 2022-05-10 (H-) 19:58:21<b><br>
A&8q</b> : CCSDS CFDP WG Meeting 12 May / B5 Update Proposals</span>
<br><span style=" font-size:10pt;font-family:sans-serif">Dear All,</span><span style=" font-size:9pt;font-family:Arial">
<br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
I have compiled a list of proposed updates to the CFDP B5 standard we should
discuss at our meeting Thursday this week:</span><span style=" font-size:9pt;font-family:Arial">
</span><span style=" font-size:9pt;color:blue;font-family:Arial"><u><br>
</u></span><a href="https://protect2.fireeye.com/v1/url?k=914e4878-ced52270-914b39f6-ac1f6bdccbcc-9cd543762a1386e7&q=1&e=89726e5c-3b82-4d4e-a18c-f744acda32e1&u=https%3A%2F%2Fcwe.ccsds.org%2Fsis%2F_layouts%2F15%2FWopiFrame.aspx%3Fsourcedoc%3D%7BC99BBAB8-D0AB-40C1-AF69-629B839D3336%7D%26file%3DB5_ProposedUpdates.xlsx%26action%3Ddefault"><span style=" font-size:12pt;color:blue;font-family:Arial"><u>B5_ProposedUpdates.xlsx
(ccsds.org)</u></span></a><span style=" font-size:12pt;font-family:Arial">
</span><span style=" font-size:9pt;font-family:Arial"><br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
We will have the meeting via MS Teams (see link below) on 12 May, 12.00
- 14.00 UTC. I hope you can make it.</span><span style=" font-size:9pt;font-family:Arial">
<br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
This is the planned Agenda:</span><span style=" font-size:9pt;font-family:Arial">
<br>
</span><span style=" font-size:10pt;font-family:Default MultiLingual"><br>
1) Potential updates to the CFDP standard</span><span style=" font-size:9pt;font-family:Arial">
</span>
<ul>
<li><span style=" font-size:10pt;font-family:Default MultiLingual">Abandon.Request
(eg, to deal with safe modes)</span><span style=" font-size:9pt;font-family:Arial">
</span>
<li><span style=" font-size:10pt;font-family:Default MultiLingual">Clarification
regarding 4.6.1.1.9 and unbounded files</span><span style=" font-size:9pt;font-family:Arial">
</span>
<li><span style=" font-size:10pt;font-family:Default MultiLingual">option
to send Finished PDU although transaction is suspended (remember PDU are
ACK'ed even if suspended)</span><span style=" font-size:9pt;font-family:Arial">
</span>
<li><span style=" font-size:10pt;font-family:Default MultiLingual">clarification
regarding sending empty files</span><span style=" font-size:9pt;font-family:Arial">
</span>
<li><span style=" font-size:10pt;font-family:Default MultiLingual">responding
to NAK if not all file segments from a previous NAK have been re-sent</span><span style=" font-size:9pt;font-family:Arial">
</span>
<li><span style=" font-size:10pt;font-family:Default MultiLingual">How
to react to NAK for unknown transactions</span><span style=" font-size:9pt;font-family:Arial">
</span>
<li><span style=" font-size:10pt;font-family:Default MultiLingual">...</span></ul><span style=" font-size:10pt;font-family:Default MultiLingual">2)
Possible introduction of a light CFDP Class 1 version (Cheol)</span><span style=" font-size:9pt;font-family:Arial">
<br>
</span><span style=" font-size:10pt;font-family:Default MultiLingual"><br>
3) Way forward, schedule, ....</span><span style=" font-size:9pt;font-family:Arial">
<br>
</span><span style=" font-size:10pt;font-family:Default MultiLingual"><br>
4) AOB</span><span style=" font-size:9pt;font-family:Arial"> </span><span style=" font-size:12pt;color:#5f5f5f;font-family:Arial"><br>
___________________________________________________________________________</span><span style=" font-size:12pt;font-family:Arial">
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Regards,</span><span style=" font-size:9pt;font-family:Arial"> </span><span style=" font-size:10pt;font-family:sans-serif"><br>
Felix<br>
</span><span style=" font-size:9pt;font-family:Arial"><br>
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