Hi If there was any accepted/standarized solution for the hidden and exposed terminal phenomena, the current work of the great part of the sciencific community coping with this problem would be unnecessary. There is a plethora of approaches dealing with these problems by making use of multichannel selection, directional antennas, TDMA... In the Tinyos case, you should take a time revising the operation of BoXMAC, and study how nodes access tothe medium taking into account if BoXMAC solves or not the hidden and exposed terminal phenomena. But first, you need more background about what you are trying to study and simulate, e.g., see the following paper: C. Cano, B. Bellalta, A. Cisneros, and M. Oliver, “Quantitative analysis of the hidden terminal problem in preamble sampling WSNs,” Ad Hoc Networks, vol. 10, no. 1, pp. 19–36, 2012. Regards David
From: [email protected] Date: Mon, 21 Jan 2013 10:26:34 +0100 To: [email protected] CC: [email protected] Subject: Re: [Tinyos-help] Hidden and Exposed node problem Theoretically, the scenario is adequate enough to cause such a problem, but in my experience, first of all it is not that frequent and secondly, the network has to be more dense which in case of just 3 nodes is not enough. So I would suggest to look into the reason more thorough, it could be just because of the collisions between 2 and 3. On Mon, Jan 21, 2013 at 7:37 AM, Suresh Kumar Das <[email protected]> wrote: I am using Tinyos 2.1. Does TOSSIM have any sort of mechanism to deal with hidden and exposed node problem. I am searching it from last 2weeks but can find any sollution. I have 3 nodes 1, 2 and 3. Nod 2 and 3 are sending packets to node 1 in . Some packets are get discarded. How can I solve this problem. Any reply or clue is appreciated. Thanks _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help -- Wasif Masood _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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