LPWAN WG IETF 108
Agenda

Meeting : IETF108 Thursday, July 30, 2020
Venue : Online
Video Link : https://www.meetecho.com/ietf108/lpwan/
Audo Link : http://mp3.conf.meetecho.com/ietf/ietf1084.m3u
Time : Session II 13:00-13:50 UTC (50min)
Location : Room 4
Chairs : Pascal Thubert pthubert@cisco.com
         Alexander Pelov a@ackl.io
Responsible AD : Eric Vyncke
Live minutes : https://codimd.ietf.org/notes-ietf-108-lpwan
Live feeds : https://datatracker.ietf.org/meeting/agenda/
Other URLs : https://tools.ietf.org/wg/lpwan/
             https://datatracker.ietf.org/wg/lpwan/
             https://www.ietf.org/mailman/listinfo/lpwan

    [13:00] Administrivia (chairs) [ 5min]
    o Note-Well, Scribes, Agenda Bashing
    o Status of drafts

    [13:05] draft-ietf-lpwan-schc-over-sigfox (Juan-Carlos Zuniga) [10min]

    [13:15] draft-ietf-lpwan-schc-over-lorawan (Olivier Gimenez) [10min]

    [13:25] draft-ietf-lpwan-schc-over-nbiot (Ana Minaburo) [ 5min]

    [13:30] draft-ietf-lpwan-schc-yang-data-model (Laurent Toutain) [10min]

    [13:40] draft-ietf-lpwan-coap-static-context-hc-15 (Ana Minaburo) [ 5min]

    [13:45] AOB, Adjourn

Minutes

Times in UTC
[13:00] Administrivia (chairs) [ 5min]

    Note-Well, Scribes, Agenda Bashing
    o displays agenda
    o displays milestones

    Status of drafts
    o OAM draft: still there, no progress at his time

[13:03] draft-ietf-lpwan-schc-over-sigfox (Juan-Carlos Zuniga) [10min]

    during hackathon, off-line coding.
    update on the draft
    o use of FCN to indicate size of packets/ # of fragments. Will test in next version of PySCHC
    next steps
    o interop at Bangkok?
    o more fine-tuning
    Laurent: for tests, openSCHC core on a public server, could be used for interop.
    JCZ: Good to know. We will look into that.
    Ivaylo: use of sequence #, means no interleaving?
    JCZ: Sigfox Seq# counter spans over multiple (frag/data) sessions. We can interleve.

[13:10] draft-ietf-lpwan-schc-over-lorawan (Olivier Gimenez) [10min]

    -08 published two weeks ago
    goes through changes in -08
    o rework of retransmission timer during the interim meeting
    no comment so far on -08
    outcome of the WGLC?
    Pascal: WGLC is finished, now working on the comments, solving the issues.
    Pascal: -08 could be submitted to IESG for publication, Dominique to do his work as shepherd (write-up + check IPR + request)
    Pascal: will tell Dominique the right way of submitting to IESG

[13:16] draft-ietf-lpwan-schc-over-nbiot (Ana Minaburo) [ 5min]

    shows 3GPP architecture, more complex than that described in RFC8376
    3 use cases for SCHC depending on NB-IoT data transmission choice (IP, non-IP, NAS)
    JCZ: in case 2, need to transfer context to visited network, complicated?
    Ana: already done for RoHC. Home HLR sends context to visited network.
    JCZ: would be interesting to explain in the draft.
    JCZ: how about SCHC over the top of NB-IoT?
    Ana: this is case 3. SCEF is used to pass the context (??)
    goes on presenting fragmentation
    Pascal: Transfer Blocks, can you explain again?
    Ana: Transfer Block increment is 2 bytes, hence the 16 bits.
    JCZ: 1000 bits not multiple of 16 bits, confusing.
    Ana: need reviewers
    Pascal: LoraWAN authors, could you have a look, compare sections for missing info, etc?
    Ivo: volunteers
    Olivier volunteers, too
    Alex: no hard deadline, in the coming weeks/month.

[13:30] draft-ietf-lpwan-schc-yang-data-model (Laurent Toutain)[10min]

    draft is stable. On GitHub LPWAN repo.
    describes the content of the draft.
    Pascal: what’s the unit of time for timers?
    Laurent: description of field says it’s seconds.
    Alex: will submit to YANG doctors for review
    Laurent reiterates draft is stable, happy with what they have now.
    How about a WGLC to raise attention and bring comments in?
    Pascal: vacation time. Even if we LC now, we will extend the review time into september?
    Pascal: then, why not get feedback from YANG doctors before WGLC?
    Alex: suggests to wait for coap-over-schc to pass IESG
    Alex: how do we get a YANG doctor review?
    Eric: ask for review by YANG doctor. Can help asking for this.
    Alex: shoot for WGLC in Sept.
    Laurent: synchronize with CORECONF.
    Pascal: why?
    Alex: we should not put a dependecy on CORECONF. This doc is self-standing. Let’s ship this one.

[13:43] draft-ietf-lpwan-coap-static-context-hc-15 (Ana Minaburo) [ 5min]

    one DISCUSS remaining to solve. (there were two more, now solved)
    goes over changes from -13 to -15
    o better depiction of various ways of using SCHC with CoAP
    o clarified uni/bidirectional terminology
    still to work before issuing -16: some comments from B Kaduk
    Pascal: thank a lot to Ana for hard work and to the IESG for the reviews

[13:50] Meeting is adjourned