[lp-wan] Architecture

[Laurent Toutain <[e-mail]>]

Dear lpwaner,

I thought we had an interim this afternoon, but the next meeting is in
Philly. I would like to discuss on the architecture and the YANG data model.

Current data model is limited to RFC 8724 and RFC8824 and can be easily
augmented for compound Ack and OAM. What is missing is how to manage the
rules. In openSCHC set of rules are assigned to a device and there is a
single core SCHC.

Carles raised the need to study a more generic approach for mesh network
where the notion of device and SCHC core do not exists anymore and rules
are more an association between a device and a core. This may be solved by
identifying the set of rules by a device ID and a core ID.

RFC 9039 (thanks to Alex for the ref) defines a way to build URN that can
be used has identifier. We can use 2 URN to identify a set of rules. But
that ASCII characters and it is not a compact representation.

So we have the current YANG data model that defines a set of rules that
will be augmented with a set of rule ID pointing both ends IDs (one of them
can be none for a star topology and both of them for PPP).

In my opinion, we should specify on the architecture document, a more
generic model covering PPP, star and mesh and also more precisely the
interaction between them. From that, we will be able to define an
augmentation of the basic data model.

The way we include a mesh model with SCHC can be an interesting thing to
investigate during the hackathon.

See you,

Laurent