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Minutes interim-2022-lpwan-02: Tue 16:00

Meeting Minutes IPv6 over Low Power Wide-Area Networks (lpwan) WG
Date and time 2022-01-25 15:00
Title Minutes interim-2022-lpwan-02: Tue 16:00
State Active
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Last updated 2022-01-25


Meeting Information

Data / Time

Meeting Information

Interim Agenda

[16:05] Administrivia [05min]

  • Note-Well, Scribes, Agenda Bashing
  • WG Status

[16:10] Compound Ack publication steps [25min]

  • data Model
  • Dominique's review
  • Shepherd selection
  • IPR

[16:35] YANG Data Model WGLC steps [20min]

  • Dominique's review
  • Timing

[16:55] AOB [ QS ]


  • Pascal Thubert
  • Alexander Pelov
  • Éric Vyncke
  • Dominique Barthel
  • Juan-Carlos Zúñiga
  • Carles Gomez
  • Ana Minaburo
  • Ivan Martinez
  • Laurent Toutain
  • Sergio Aguilar


[16:05] Administravia [05min]

  • Note-Well, Scribes, Agenda Bashing
  • WG Status

Alexander does the usual agenda bashing.

[16:10] Compound Ack publication steps [25min]

  • data Model
  • Dominique's review
  • Shepherd selection
  • IPR poll/declaration

Pascal reviews conclusions from last meeting. (slide 8)
JCZ: was not able to attend last meeting, got debrief from Sergio. Discussed between the authors.
Pascal: the objective of the OLD/NEW is to have a formal explanation of what you want to achieve. It leaves some questions how to implement the changes.
JCZ: there is already the normative language, but didn't want to repeat text.
Dominique: The juxtaposition of this text and RFC 8724 can be ambiguous; I agree that 3.2.1 and 3.2.2 become informational (no uppercase) and to have a 3.2.3 which unambiguously describes what 8724+compound_ack looks like. Think of a patch file that rewrites RFC8724's text.
JCZ: useful feedback. We will do the changes
Pascal: Did not find a shepherd. Polled the int directorate, but no answer.
Éric: polling the call to find a candidate; no answer :-(
Alexander: to do poll the mailing list
JCZ: we will nee to update the data model
Laurent: I made the change, I need to send to you.

[16:35] YANG Data Model WGLC steps [20min]

  • Dominique's review
  • Timing

Laurent: pushed new stuff on the github; unstable so not pushed to datatracker.

Introduced a compression feature

Edgar does not use compression in his doc, better make it a feature, like fragmentation already was.
Alexander: see it as: in a switch, IP may be a feature so it's not there if the switch is pure layer 2.

Introduced a max interleaved packets

default of 1 is suggested e.g., if we do slow start
must be less than 2^dtag_size, but not sure how to express that in YANG
Dominique: max-window-size is called window size in the RFC.
Laurent: OK
Pascal: the comment could be more informative, indicating that it is the maximum numbre of tiles

Ack behavior

Laurent : changed to indicate that the L2 decides when to send acks

Window size

Laurent: packaged parameters to form the frame together, then the fragmentation

discussion on the penultimate tile

Laurent: I do not understand the penultimate tile comment

Dominique: to do: find the slides expliciting the issue and discuss next time

Dtag lifetime

Dominique: hard to use the inactivity timer since the sender and receiver do not have the same lifetime since packets may be lost

Pascal: yes but the sender times out after the receiver so the sender is safe to reuse the dtag when it times out

Dominique: not efficient since lifetime can be long.

Dominique: to do: try to find again what the issue was with the DTag lifetime at the receiver, if there really was any issue at all.

No compression rule

Laurent: todo : if there are compression rules (compression "feature"), then there must be a no-compression rule.

[16:55] AOB [ QS ]