[Roll] Σχετ: Enhanced RPL functionality on J-Sim platform

Hi Ulrich,
Yes. Our implementation defines 29 different ways to construct DODAGs, according to the application- or user-specific requirements. 

This is achieved through the selected Objective Code Point (OCPs), defined in RFC6550 as "an identifier that indicates
which Objective Function the DODAG uses". As an example, using OCP = 0, the DODAG will be built on Hop-Count metric, while using OCP = 1, the DODAG is based on ETX. As a more complex example, OCP = 15 defines an OF where HC is the dominant metric (highest precedence) and remaining energy is the second (tie-breaking) metric. Almost any combination of the supported metrics set (HC, ETX, RSSI, RE, PFI) defines an OCP and a respective OF.

The OCPs are mentioned in the tcl examples and defined in the jsim-1.3\src\drcl\inet\protocol\rpl\RPL_ObjFunctions.java.In that sense, each OCP defines a different OF that maximizes (or minimizes) the Rank value (depending on whether the metrics are maximizable or minimizable). 
BR,
Panos.

________________________________
 Απο: Ulrich Herberg <ulrich@herberg.name>
Προς: Panos Trakadas <trakadasp@yahoo.gr> 
Κοιν.: roll <roll@ietf.org> 
Στάλθηκε: 11:56 μ.μ. Τρίτη, 12 Ιουνίου 2012
Θεμα: Re: [Roll] Enhanced RPL functionality on J-Sim platform

Hi,

it's always good to have open-source implementations. Thank you!

On a quick glance, it seems that you define one objective function
code per OF+metric (i.e., for a single objective function multiple
variations per metric). Have I understood your code correctly in that
regards?

Best
Ulrich

On Tue, Jun 12, 2012 at 12:36 AM, Panos Trakadas <trakadasp@yahoo.gr> wrote:
> Dear all,
> Following the exchange of emails during the last days regarding MRHOF and in
> general the on-going discussion on metrics composition and multiple
> instances support, we would like to inform you that we uploaded a powerful
> simulation platform of RPL, enhanced with several metrics (and about 30
> OFs), composition approaches and support of multiple instances at the google
> code repository (http://code.google.com/p/rpl-jsim-platform/downloads/list).
> This work has started within FP7 project VITRO, as there was no open source
> code for running simulations of RPL.
> The source code is, in general, in line with RPL specs (we tried to reflect
> some changes, as development started on version 13 of RPL RFC).
> For convenience, we provide an installation guide for j-sim and rpl source
> code as well as detailed explanation for several examples included in the
> source code (ROLL_examples folder in the downloaded zip file).
> Please notice that this simulation platform introduces a trust-aware routing
> metric, called Packets Forwarding Indication (PFI) and supports the
> composition of multiple metrics (ETX, HC, RSSI, RE) in accordance to the
> draft-zahariadis-roll-metrics-composition document.
> Please do not hesitate to contact us for further information or
> clarifications.
> We also proceed with implementing enhanced functionality on real motes.
> Please see relevant videos on youtube:
> http://www.youtube.com/watch?v=jscSdMbDRA0&feature=plcp
> http://www.youtube.com/watch?v=VzO_DyXz8vw&feature=plcp
> http://www.youtube.com/watch?v=14ldt3-VVuw&feature=plcp
> or visit VITRO project website (http://www.vitro-fp7.eu/).
> Best Regards,
> Panos Trakadas.
>
>
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