Re: [6tisch] Comment to draft-wang-6tisch-6top-coapie-01.txt

We need to discuss this point urgently, and do the work to ask the IEEE for
carve out some IE space for IETF/6TISCH if applicable.

On Thu, Jul 23, 2015 at 4:28 PM, Qin Wang <qinwang6top@yahoo.com> wrote:

> Hi Pat,
>
> Since there are two approaches mentioned in the discussion, i.e. (1)
> containing 6top-to-6top message in a specific payload IE (coapie), (2)
> using the mechanism provided by IEEE802.15.9 to convey the 6top-to-6top
> message, I would like to do more evaluation. I couldn't find the
> IEEE802.15.9 spec on IEEE802 website. Can you tell me how to get it?
>
> Thanks
> Qin
>
>
>
> On Tuesday, July 21, 2015 8:59 PM, Tero Kivinen <kivinen@iki.fi> wrote:
>
>
> This draft plans to put the coap messages directly on the payload IEs
> in the 802.15.4. The problem is that we only have 16 payload IE types
> in total for 802.15.4, so reserving one number for coap might be hard.
>
> On the other hand IEEE 802.15.9 needed to have solution to this same
> problem, i.e how to multiplex upper layer data packet over 802.15.4
> frames and how to fragment them so they can fit on the 802.15.4
> frames.
>
> The 802.15.9 is split in two layers, first one is the multiplexed data
> service, which takes 16-bit MultiplexId and the data packet to be sent
> to the other end, and it will fragment and deliver it to the other
> end. The MultiplexId is used to separate different protocols using
> this mechanism. One of those protocols is the key management protocols
> providing KMP for 802.15.4, which is the second part of the 802.15.9.
>
> Instead putting the coap messages in the payload IEs, it would
> possible to allocate one MultiplexId for coap messages, and then coap
> messages could be transmitted using multiplexing layer of 802.15.9.
> This would also take care of fragmentting the messages (with PHY using
> 127 octet PSDU, the maximum size of the data packet is around 24kB).
>
> The 802.15.9 recommended practice is already past the working group
> letter ballots, and is starting its sponsor ballot soon. It is
> expected to come out around the end of year. The draft will be
> available on the ieee document store after the sponsor ballot starts,
> i.e. very soon.
> --
> kivinen@iki.fi
>
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