Hi,
There are two components to the link model in TOSSIM 2.0.2: noise and
gain. Noise is the external interference and noise from sources other
than the TinyOS network, which gain is the strength at which nodes in
the network can hear packets that other nodes send. The probability
of receiving a packet is given by the signal to noise ratio, which is
gain - noise in the dB scale considered here. This is explained in
http://sing.stanford.edu/pubs/ipsn07-noise.pdf
TOSSIM currently considers that gain is constant per node pair, and
network topologies can be constructed using the tool discussed at
http://www.tinyos.net/tinyos-2.x/doc/html/tutorial/usc-topologies.html
The TOSSIM tutorial shows how to use python to parse this tool's output
and to input the gain values to the simulator. Search for "topo.txt" in
this entry:
http://docs.tinyos.net/index.php/TOSSIM#Configuring_a_Network
Regarding the noise values, you can collect noise samples from your
environment using
tinyos-2.x-contrib/stanford-sing/apps/RssiSample
To create an artificial "low noise" environment, you can create a
text file with very low values. If your values in the noise file are
all at least 14 below the values used for gain, then all packets are
received. Just be sure to have at least 100 entries in the file.
Thanks,
Tal
> Hello
>
> How can I use a topology file in TOSSIM
> (http://www.tinyos.net/dist-2.0.0/tinyos-2.x/doc/html/tutorial/usc-topologies.html)
> once I have the .out
> files?
>
> The Tossim wiki show how to integrate a text file noise model like
> heavy-meyer but I didn't find how to use this outpouts.
>
> best regards
>
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>
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