On Sep 24, 2008, at 2:04 PM, funofnet Funofnet wrote:
> Hi all,
>
> I noticed that sometimes when I generate two link gain model files
> ("linkgain.out")
> by the "LinkLayerModel" java class for the same configuration, then
> I ran a simulation to compute for example the packet delivery rate
> of my application, I obtained incomparable results.
>
> Let me give you an example for best understanding:
> A simulation with the first linkgain file lets me get an PDR=0,6.....
> in contrast, a simulation with a second linkgain file (I repeat: for
> the same configuration) lets me get an PDR=0,05....
>
>
>
> It is a strange thing which lets Tossim simulation results to be not
> RELIABLE!!!!!
>
Do you mean "deterministic?"
Of course the link model generator is not deterministic; it considers
hardware variations. The point is that two sets of nodes, placed in
identical physical layouts, might have different packet reception
ratios due to sensitivity variation across the nodes. You're testing
two different networks, and so the results are, well, different. If
you want to test the same network, use the same link gain file.
Phil
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