Minutes IETF110: 6lo
minutes-110-6lo-00

Introduction and draft status Bhandari/Gomez 10 min
Agenda bashing; blue sheets; scribe; Jabber scribe
minute taker: Laurent Toutain
agenda bashing: no modifications

Erik: RFC editor wait for some reference to be published
https://www.rfc-editor.org/cluster_info.php?cid=C310 NFC draft : Blocking
comment from one of the x-IESG reviewer about the refererred NFC spec being not
open.

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Status of IPv6 mesh over BLE draft Carles Gomez 15 min
https://tools.ietf.org/html/draft-ietf-6lo-blemesh-09

-09 published as answer to pre IESG review
-09 reviewed 2 discusses and comments

Martin Duke's Discuss:
Avoid MTU renegotiation, with MTU to 1280 Bytes
No comment

Benjamin Kaduk's Discuss. Neighbor discovery:
Pascal: The registration of the LL is used for global address,
Pascal: can create problems
Carles: see how to solve this

Comments:
ND

Pascal: 8505 is a MUST, packet may be discarded, side effects with SAVI
Carles: cleaner to avoid this issues
Pascal: use long lifetime
Pascal: can use lowercase

RA MAY include a 6CO, RFC7668 has a MUST
not needed for out-of-band

Align requirements language to RFC 8174

Pascal will review -10

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Status of IPv6 over PLC draft Liu Bing (Remy) 15 min
https://tools.ietf.org/html/draft-ietf-6lo-plc-05

IESG review, draft updated soon, answers on the mailing list

sec
1)move some informational section to annex or remove

Carles: I’d suggest keeping it. There are similar sections in other 6lo IPv6
over foo documents.

No other comments

3)Change refence to RFC 8065

    remove redundant text

tsv-art
opsdir: explanation on self-organising network

No comments on these updates from the room

Carles: next version can go to IESG evaluation

Update of Applicability and Use Cases draft Yong-Geun Hong 30 min
https://datatracker.ietf.org/doc/html/draft-ietf-6lo-use-cases-10

result for WGLC:
correction of typos and editorial comments

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SCHC header compression in 6lo environments
(incl. 6LoWPAN Dispatch Type for SCHC) Carles Gomez 20 min
https://tools.ietf.org/html/draft-gomez-6lo-schc-dispatch-01

6282 was designed for 15.4 or similar technologies
compression of IPv6/UDP to 7 bytes

8724 (SCHC) provides Header compresison and fragementation for LPWAN network
more constrained than 15.4

IPv6/UDP to 1 byte due to static context with well-known values

6LoWPAN goes to 11 bytes when compressing CoAP/UDP/IPv6 but does not compress
CoAP SCHC results in 2 bytes when compressing CoAP

proposal: add SCHC HC to 6lo as a complement to IPHC

Signal how SCHC is used
have a SCHC dispatch that indicates that there is a SCHC compressed packet

draft-gomez-6lo-schc-dispatch-01 proposes a dispach based on pages given by RFC
8025

Then, Carles presents the potential performance improvement:
it is possible (in theory) to reduce from 11 bytes to 3 bytes (where 2 bytes is
the SCHC compressed header) leading to a battery lifetime increased by up to
40%, and up to 44% in star-based topology.

    A 6lo dispatch type is needed for SCHC
    Need to consider if handling padding is required
    Context provisioning, lpwan is studying some solution

SCHC for upper layers: a SCHC LOWPAN_NHC can be used (2 are already defined)

Carles: what the wg thinks of this proposal:
Laurent, Dominique, Georgios: good thing to do
Chat also supports it

Pascal, regarding use of SCHC for upper layers, 6282/8138 for the network
layer: it is not clear how it would be encoded in the packet. The most useful
case is when IP and CoAP are both compressed by using SCHC. Dominique: agree,
how do we deal with address compression. Pascal: we are more in a P2P model,
use th MAC address. SCHC is open, you can compress eht prefix but not the IID
Dominique: add a CDA for that may be.

Shwetha: fits the charter, can continue to work on it

Carles: draft is open to new contributors

Session adjourned.

Total: 90 min