[Tinyos-help] Gray area in TOSSIM

[João Carlos Giacom in]

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; SenSys’03. California, USA. Nov 5-7, 2003. pp. 14-27

***************** 
 João Giacomin 
 Prof-DCC-UFLA 
*****************

---------- Original Message -----------
From: Nouha Baccour <nouha.baccour at gmail.com> 
To: tinyos-help at millennium.berkeley.edu 
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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