Re: [6tisch] slot schedluing

[Tero Kivinen <[e-mail]>]

Pascal Thubert (pthubert) writes:
> Seems that large EBs at low rates ended up being a problem in subgig cases
> after all, Dale.
> 
> The discussion at the interim was either to make very large slots =>
> impractical, or preconfigure sometimes, 2 or more consecutive time slots are
> paired; the second is never scheduled, and is free to accept the remainder of
> the frame sent in the first… The pairing will be interesting to make work,
> ince the channel computation is based on ASN so the consecutive time slots to
> not have the same channel offset….

I do not think you can do that. 802.15.4-2015 section 6.7.5
Transmission timing restrictions specifies that you have allowed
transmission interval (ATI), and in TSCH that is TSCH timeslot, which
have specific start and stop times. Node is not allowed to go over
that, i.e., the transmission must be completed before the end of ATI,
and also if this is ACKed transmission the original sender must allow
enough time for the other end to send back the appropriate ACK frame
with required IEs (i.e. Time Synchronization in TSCH). There is also
guard time to make sure that even if someone starts early we do not
run over with previous transmission.
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