Re: [6tisch] 6P and Sf0 issue: Statistics for SFs and Relocation

Thomas Watteyne <thomas.watteyne@inria.fr> Fri, 11 March 2016 14:23 UTC

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From: Thomas Watteyne <thomas.watteyne@inria.fr>
To: "Prof. Diego Dujovne" <diego.dujovne@mail.udp.cl>
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Cc: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, "6tisch@ietf.org" <6tisch@ietf.org>
Subject: Re: [6tisch] 6P and Sf0 issue: Statistics for SFs and Relocation
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+1

On Friday, March 11, 2016, Prof. Diego Dujovne <diego.dujovne@mail.udp.cl>
wrote:

> Pascal,
>            Agreed. Then we should add a
> new SHOULD item at the end of the
>
> "4.2.  Requirements for an SF"
>
> section on the 6TiSCH Operation Sublayer (6top) draft
> to include statistics.
>
> Regards,
>
>                   Diego
>
> 2016-03-04 8:21 GMT-03:00 Pascal Thubert (pthubert) <pthubert@cisco.com
> <javascript:_e(%7B%7D,'cvml','pthubert@cisco.com');>>:
>
>> I’d support that, Diego
>>
>>
>>
>> If the visible operation of the device depends on it and that influences
>> the interoperation, it is good to document a base way of doing things.
>>
>>
>>
>> Cheers,
>>
>>
>>
>> Pascal
>>
>>
>>
>> *From:* 6tisch [mailto:6tisch-bounces@ietf.org
>> <javascript:_e(%7B%7D,'cvml','6tisch-bounces@ietf.org');>] *On Behalf Of
>> *Prof. Diego Dujovne
>> *Sent:* jeudi 3 mars 2016 20:26
>> *To:* 6tisch@ietf.org <javascript:_e(%7B%7D,'cvml','6tisch@ietf.org');>
>> *Subject:* [6tisch] 6P and Sf0 issue: Statistics for SFs and Relocation
>>
>>
>>
>> Dear all,
>>
>>            Given the requirements to build SFs exposed
>>
>> in the 6tisch sublayer draft, there is no specification
>>
>> on how to obtain the statistics and calculate and build
>> the metrics used to decide when to add/delete/relocate
>>
>> cells. The draft asks only for the set of rules.
>>
>>           SF0 defines an algorithm using specific values
>>
>> as thresholds and rules for adding/removing cells and
>> uses PDR and a simple decision rule to decide which
>> cell to relocate.  However, this may not be the case
>> for the other (possibly more complex) SFs, where
>> metrics based on statistics could be included.
>>
>>            Shall we include a section on the description
>>
>> of how to calculate the specific statistics used on each
>>
>> SF, or just leave this out of scope to the implementer?
>>
>> My point of view is that statistics should be specified
>>
>> in order to be able to interoperate between different
>>
>> implementations of the same SF.
>>
>>             What do you think?
>>
>>             Thank you,
>>
>>                                   Diego Dujovne
>>
>>
>>
>>
>> --
>>
>> DIEGO DUJOVNE
>> Académico Escuela de Ingeniería en Informática y Telecomunicaciones
>> Facultad de Ingeniería UDP
>> www.ingenieria.udp.cl
>> (56 2) 676 8125
>>
>
>
>
> --
> DIEGO DUJOVNE
> Académico Escuela de Ingeniería en Informática y Telecomunicaciones
> Facultad de Ingeniería UDP
> www.ingenieria.udp.cl
> (56 2) 676 8125
>


-- 
_______________________________________

Thomas Watteyne, PhD
Research Scientist & Innovator, Inria
Sr Networking Design Eng, Linear Tech
Founder & co-lead, UC Berkeley OpenWSN
Co-chair, IETF 6TiSCH

www.thomaswatteyne.com
_______________________________________