Nouha, I am not sure if I have understand your problem, but I think you can find some information in David Culler`s paper:
Woo, A.; Tong, T.; Culler, D.; Taming the Underlying Challenges of Reliable Multihop Routing in Sensor Networks; SenSys03. California, USA. Nov 5-7, 2003. pp. 14-27 ***************** João Giacomin Prof-DCC-UFLA ***************** ---------- Original Message ----------- From: Nouha Baccour <[email protected]> To: [email protected] Sent: Sun, 25 Jan 2009 22:50:48 +0100 Subject: [Tinyos-help] Gray area in TOSSIM > > Hi all, > > I'm using TOSSIM simulator. > Based on extensive simulations, I draw the curve PRR (Packet reception rate) > according to distance. > This curve shows three reception regions (connected, gray and disconnected), > as it is observed in actual sensor networks. > Inside the gray (called also transitional) area, the PRR is expected to > fluctuate between 0.15 and 0.85 and it is not correlated with distance. > However, in my curve, I found that the PRR shows a relatively smooth decay > with distance which is uncommon (the PRR is not correlated with distance). > > This observation is not acceptable because TOSSIM uses an accurate link layer > model. > > Note that I used the environment parameters as in the Tutorial: > http://www.tinyos.net/dist-2.0.0/tinyos-2.x/doc/html/tutorial/usctopologies.html > > > Can someone tell me where the problem can be (in the environment setting, in > the accuracy of TOSSIM, [WINDOWS-1252?] ) > > Thank you ------- End of Original Message -------
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