Minutes interim-2018-lpwan-07: Wed 17:00
minutes-interim-2018-lpwan-07-201806271700-01

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*    Date: June 27, 2018
*    Time: 8-9AM DST, 17:00 CEST:
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Agenda
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*    [17:05] Administrivia                                           [ 5min]
    o    Note-Well, Scribes, Agenda Bashing
    o    Status of drafts

*    [17:10] SCHC Tickets and Discussed options - Ana                [40min]
*    [17:50] SCHC / OSCORE - Laurent + Ricardo                       [10min]
*    [18:00] AOB                                                     [ 0min]

Minute takers
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*    Ana Minaburo
*    Pascal Thubert
*    Dominique Barthel
*    Carles Gomez
*    Alexander Pelov

Attendees
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*    Ana Minaburo
*    Laurent Toutain
*    Pascal Thubert
*    Dominique Barthel
*    Carles Gomez
*    Alexander Pelov
*    Arunprabhu Kandasamy
*    Ivaylo Petrov
*    Ricardo Andreasen
*    Vincent Audebert
*    Sivasothy Shanmugalingam

Minutes
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*    [17:05] Administrivia                                           [ 5min]
    o    Note-Well, Scribes, Agenda Bashing
    o    Status of drafts

    Pascal: Give the Note Well
    Pascal: Reviewers are needed for CoAP , Thanks for the SCHC reviewers
    Laurent: for the CoAP draft, we need reviewers from CoRE
    Pascal: Action item for the chairs - find reviewers from CoRE for the SCHC
    COAP Pascal: info to be provided about Agenda items for IETF 102
ToDo:  Answer mail to ask presentation time slot

*    [17:10] SCHC Tickets and Discussed options - Ana                [40min]

    Dominique: consensus based decision to integrate the single padding solution

    Text clean up on following week. link with github commits tracking available

    Feedback from Ana, Carles and Laurent, to be published before week-end

    Dominique is now working on integrating the comments from other co-authors,
    shooting for publication before weekend.

    Not all spelling/language related issues will be addressed, the goal is to
    send to the IESG.

    Ana closed all tickets last week, except 3 (15, 30, 31).

    All the information that tech documents must provide will be indicated;
    ticket still open to review

    This becomes appendix D, WG asked to recheck

    Ana: ticket #30 text and FSM do not exactly match each other. Can we remove
    the condition (local bitmap == received bitmap)?

    Dominique: yes, it can be removed

    Ana: ticket #31: we go to "ERROR", but the action is missing

        Dominique: when investigating this, pay attention to figure numbering
        (the new versions on github have extra figures compared to published
        document, so figure numbers are shifted) Dominique [going through the
        closed tickets, and related explanations] Dominique: #12, became
        irrelevant after single-padding addition DB: added a figure
        illustrating C/D and F/R including padding operations DB: #20, removed
        left arrow, only keep the right one (L2 Word boundary) DB: #21, SCHC
        ACK "bump", due to presence of the C bit in the last SCHC ACK.
            Resolution: last window has same maximum number of frags, but
            tech-specific documents may revert that. Text on this also in
            Appendix D.
        DB: #22, clarified that F/R is optional (i.e. to be used if needed)
        DB: #23, variable L2 PDU sizes. Resolution: the SCHC draft states that
        L2 MTU is assumed not to vary while a packet is fragmented and
        transmitted.Abort the transmission, if there is any change in L2MTU
        while fragmentation is ongoing. DB: #24, what if DTag not present?
        Resolution: made it explicitly clear in Section 7.2. DB: #25, rule
        tables not synhronized? Out of scope for the SCHC draft. DB: #26,
        matching SCHC ACKs and SCHC Fragments? Instead of keeping extra state,
        the Resolution is: same Rule ID needs to be used DB: #28, was an
        editing mistake. Now solved. DB: Questions? Pascal: I'll be
        shepherding. As soon as you post the draft, I'll start the process and
        ask about awareness of IPRs that apply to this draft. Alexander: will
        replace Dominique with Pascal as shepherd on the Datatracker

            Sothy: Ask why Multi-Rat is being there if it is not used?

        Dominique: This was an input from Edgar Ramos and the ticket was
        captured this way.
            Anyway, the underlying question (L2 PDU size that is not constant
            through fragmented SCHC Packet transmission) stays. For example,
            this shows up when LoRaWAN switches datarate (Adaptative Data Rate)
            which changes the max L2 PDU size. Maybe "multi-RAT" is not
            relevant in the ticket, but the ticket still stays.

Alex: When is the reviews deadline date?
Pascal: We can make another last call, but what I want is to review CoAP draft.
SCHC IP/UDP is done, we publish, it is too late. New reviewers are for SCHC
CoAP not SCHC IP/UDP, for monday a final review to make the publication

*    [17:50] SCHC / OSCORE - Laurent + Ricardo                       [10min]

        Ricardo presents the slides on SCHC compression applied to OSCORE
        Laurent: OSCORE adds 10 bytes to a regular message (after SCHC
        compression) Alexander: what kind of protection? Ricardo: AES-CCM for
        the encryption

        Laurent: implementation is in Python
        Pascal: great work, but appears it doesn't change the CoAP draft...?
        Pascal: I don't think ADs will like the idea of having a special draft
        just for OSCORE Ana: if we add it, we can get more reviewers from CoRE
        Ricardo: have been working on a document describing this (could be
        published in 2 days) Alexander: the priority would be to add this to
        the CoAP draft. Pascal: you could also add content in an annex, as an
        example. Happy if it can be added to the draft by Monday Laurent: We
        need a special processing for the OSCORE option since it must splitted
        in 2 parts to use MSB

Pascal: Laurent & Dominique please  publish the last version of the SCHC IP/UDP
draft during this weekend, not time to make reviews. For Monday Pascal starts
sending the IPR mail.

*    [18:00] AOB                                                     [ 0min]