Re: [6tsch] scheduling of cells

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

Return-Path: <twatteyne@gmail.com>
X-Original-To: 6tsch@ietfa.amsl.com
Delivered-To: 6tsch@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AE2ED11E80F2 for <6tsch@ietfa.amsl.com>; Tue, 17 Sep 2013 19:24:50 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.471
X-Spam-Level:
X-Spam-Status: No, score=-1.471 tagged_above=-999 required=5 tests=[AWL=0.506, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sl799PrmQ+pJ for <6tsch@ietfa.amsl.com>; Tue, 17 Sep 2013 19:24:49 -0700 (PDT)
Received: from mail-ea0-x234.google.com (mail-ea0-x234.google.com [IPv6:2a00:1450:4013:c01::234]) by ietfa.amsl.com (Postfix) with ESMTP id 00DCD11E8155 for <6tsch@ietf.org>; Tue, 17 Sep 2013 19:24:22 -0700 (PDT)
Received: by mail-ea0-f180.google.com with SMTP id h10so3151339eaj.11 for <6tsch@ietf.org>; Tue, 17 Sep 2013 19:24:22 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=qxunM6LvH3uJxtaP3HWQVBm+dB8HIrVJQVuUDhXElN8=; b=GTZE12oIsr3LFMEVlQPGQkDuvDDS0u8UOLE2PZdQOd5PcInHA2W9CDUvCvA8xrEyQt AvKThy1hl0G3AvD/nKQ50tDvZyZPOHbqYeuqTmTIGypwRuAMQNuSwyo4zaPbszNIMa8m Hkky83HHmpuDCsnGapHcv4e56ASNZkU/vvobwYA+dMxvCnhdSMyMGACSs3jVRA3xa8PW wwBYVx4j7Eog6aywLdDcYf/UBt+HGOZnro0j8D+uudSaspuvB01Ob/IasKFcJpIN4dy7 SjfYKnOF7k0k7I/CBP2IuO325PYaMPw6ytKambdTVZJC5bSFNEVAyRT2e1WPic1QhK3V kmtQ==
X-Received: by 10.14.224.198 with SMTP id x46mr124433eep.53.1379471062085; Tue, 17 Sep 2013 19:24:22 -0700 (PDT)
MIME-Version: 1.0
Sender: twatteyne@gmail.com
Received: by 10.14.119.73 with HTTP; Tue, 17 Sep 2013 19:24:02 -0700 (PDT)
In-Reply-To: <1379134561.87069.YahooMailNeo@web121105.mail.ne1.yahoo.com>
References: <1379134067.81607.YahooMailNeo@web121105.mail.ne1.yahoo.com> <1379134561.87069.YahooMailNeo@web121105.mail.ne1.yahoo.com>
From: Thomas Watteyne <watteyne@eecs.berkeley.edu>
Date: Tue, 17 Sep 2013 19:24:02 -0700
X-Google-Sender-Auth: YrNHDsy6qRiPJF8LNHoJEEmYidY
Message-ID: <CADJ9OA8ANag6+6poSuU=dEZsv_caHYNFeXk3zr2VqKmiToykvQ@mail.gmail.com>
To: "6tsch@ietf.org" <6tsch@ietf.org>
Content-Type: multipart/alternative; boundary=047d7b66f28ba2529304e69f22f8
Subject: Re: [6tsch] scheduling of cells
X-BeenThere: 6tsch@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/6tsch>, <mailto:6tsch-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/6tsch>
List-Post: <mailto:6tsch@ietf.org>
List-Help: <mailto:6tsch-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/6tsch>, <mailto:6tsch-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 18 Sep 2013 02:24:50 -0000

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;wrote:

> Ohhhh... Excuse me
> Previously thanks for your response. :)
>
> Mehdi
>
>   ------------------------------
>  *From:* mehdi sabzevari <mehdi.sabzevari@yahoo.com>
> *To:* "6tsch@ietf.org" <6tsch@ietf.org>rg>; "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
>
>
> _______________________________________________
> 6tsch mailing list
> 6tsch@ietf.org
> https://www.ietf.org/mailman/listinfo/6tsch
>
>
>