Re: [6tisch] [MSF] Suggestion from simulation and experiment result

Simon Duquennoy <simon.duquennoy@ri.se> Fri, 09 November 2018 19:29 UTC

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From: Simon Duquennoy <simon.duquennoy@ri.se>
Date: Fri, 09 Nov 2018 20:29:40 +0100
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To: Tengfei Chang <tengfei.chang@inria.fr>
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Subject: Re: [6tisch] [MSF] Suggestion from simulation and experiment result
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Hi Tengfei, all,

Thanks a lot for the hands-on experience and enhancement suggestions. I've
got a few questions (let me know if you'd rather have them discussed at the
MSF interim):
* What are TxRx shared and non-shared autonomous cells?
* At each node, how many of each and at which timeslot/channel-offset?
* Why at least one managed cell aside autonomous cells? What doesn't work
with having 0 at first, then very quickly noticing you need N and
installing them? Could it be that you saw overly congested autonomous cells
because you were on 101-long slotframes? Have you tried with a shorter
slotframe #1?

Thanks,
Simon


On Fri, Nov 9, 2018 at 6:27 PM Tengfei Chang <tengfei.chang@inria.fr> wrote:

> All,
>
> The following are the suggestions and recommendations we mentioned during
> the 6tisch meeting yesterday. Those points will be addressed and pushed to
> the new version draft-ietf-6tisch-msf-02
>
>
>    - The  NumCellsUsed is no incremented during backoff wait delay for
>    TSCH retransmission algorithm. (suggestion: only apply adaptive traffic
>    algorithm on non-shared cell)
>    - Some usage about Frame Pending bit is under specified, the usage of
>    pending bit in MSF will be updated once it's specified.
>    - Only reserve autonomous cell on demand, for each node
>       - Reserve one TxRx shared  autonomous cell to parent/JP (unicast
>       cell)
>       - Reserve one TxRx non shared autonomous cell (anycast)
>       - Reserve at least one managed Tx cell  (reserved by Sixtop) aside
>    with autonomous cell, and upstream application traffic only goes on managed
>    Tx cells
>    - EB can be sent when the node has a parent, DIO should be sent after
>    when one managed Tx cell is installed to the parent
>
> Regards,
> Tengfei
>
> --
> Chang Tengfei,
> Postdoctoral Research Engineer, Inria
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