Re: [6tisch] slot schedluing

[[e-mail] (Dale R. Worley)]

Tero Kivinen <[e-mail]> writes:
> IEEE Std. 802.15.4-2015 EB can be up to any length that the PHY will
> support. In the normal 2.4GHz O-QPSK PHY this is 127 bytes.
>
> Other PHYs do have other limits, and for example the 802.15.4t
> "Amendment: Higher Rate (2 Mb/s) Physical (PHY) Layer" will support
> max frame size of 2048 bytes on the same 2.4GHz band (with higher data
> rate).

So that's the keys, different PHYs have different link-level framing,
and some allow longer packets.

I assume that if using one of those PHYs, the time slots are still long
enough for any frame (within the limits allowed by the PHY and network
configuration).

> In the 802.15.10 "Recommended Practice for Routing Packets in IEEE
> Std 802.15.4 Dynamically Changing Wireless Networks" which provides
> mesh networking and routing to the 802.15.4 they will include several
> IEs in EBs, and EBs are separated so that some EBs have TC IEs, some
> have NLM IEs and so on. And because NLM IEs can still be too large,
> they will send them in pieces, i.e., the NLM IE contains internal
> subsetting, where they send the whole list of neighbors over multiple
> NLM IEs. 

That's interesting, as it sounds like 802.15.10 will put the routing
protocol will be done at the link level rather than within IPv6.  Is
this aligned with the work ROLL is doing, or is it an alternative?

Dale