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Re: [6tsch] scheduling of cells

Thomas Watteyne <watteyne@eecs.berkeley.edu> Wed, 18 September 2013 02:24 UTC

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From: Thomas Watteyne <watteyne@eecs.berkeley.edu>
Date: Tue, 17 Sep 2013 19:24:02 -0700
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Subject: Re: [6tsch] scheduling of cells
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Mehdi,

The IEEE802.15.4e standard [1] allows you to put information about the
cells to use in two places:
- as part of the the "TSCH Slotframe and Link" Information Element,
directly inside the Enhanced Beacon (EB). I believe the EB is what you call
advertisement. You can use this method indicate to a joining nodes a
minimal set of cells to contact the network, which will then install more
permanent cells.
- as part of an upper-layer protocol, which it what we are currently
discussing in the 6TiSCH group. This protocol would allow either a central
PCE, or a distributed scheduling entity to contact a node and give it the
list of cells to install.

This is hopefully clearly explained in
draft-watteyne-6tsch-tsch-lln-context [2]

As detailed in our charter [3], the 6TiSCH is cutting the problem in two
steps:
- in the first step, we only consider the minimal set of cells to enable
communication. This is detailed in draft-vilajosana-6tsch-basic [4], and
one could imagine that this cells are installed through the EBs
- in a second step, the PCE learns about the nodes in the network, and
installs the necessary cells using this higher-level protocol [5]. We are
currently discussing CoAP and CBOR as candidates for that protocol.

I hope this answers your question,
Thomas

[1] http://standards.ieee.org/getieee802/download/802.15.4e-2012.pdf
[2] http://tools.ietf.org/html/draft-watteyne-6tsch-tsch-lln-context-02
[3] https://datatracker.ietf.org/doc/charter-ietf-6tisch/
[4] http://tools.ietf.org/html/draft-vilajosana-6tsch-basic-01
[5] http://www.ietf.org/mail-archive/web/6tsch/current/msg01220.html


On Fri, Sep 13, 2013 at 9:56 PM, mehdi sabzevari
<mehdi.sabzevari@yahoo.com>wrote:

> Ohhhh... Excuse me
> Previously thanks for your response. :)
>
> Mehdi
>
>   ------------------------------
>  *From:* mehdi sabzevari <mehdi.sabzevari@yahoo.com>
> *To:* "6tsch@ietf.org" <6tsch@ietf.org>; "twatteyne@gmail.com" <
> twatteyne@gmail.com>
> *Sent:* Saturday, September 14, 2013 9:17 AM
> *Subject:* [6tsch] scheduling of cells
>
> Hi All
> I have a question about scheduling of cell as shared/dedicated, Previously
> thanks for your request. :)
>  What is the best time(place) for scheduling a cell as shared/dedicated?
> Can it be scheduled by advertisement? or It should be schedule before
> communication of peers?
>
>
> Regards
> Mehdi
>
>
> _______________________________________________
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> 6tsch@ietf.org
> https://www.ietf.org/mailman/listinfo/6tsch
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>
>

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