Hi, I'm developing an application to track a mobile node in a sensor network. My application is facing a problem of packet loss. To start with a very simple topology, I've taken 3 nodes 0,1, and 2 (2 is the mobile node) on the following coordinates respectively: (0,0), (10,0) and ( 0.03,0). My purpose is to let node 2 hear some PROBE messages from node 0, and reply with a BEACON message that will be heard by node 0 with a probablity higher than with what node 1 hears the BEACON message. I generated the radio model for this topology using LossyBuilder, so I've now a .nss file with bit error rates following Gaussian packet loss probability distributions for each pair of nodes. But the problem is, although I can see motes 0 and 1 periodically broadcasting the PROBE messages, node 2 does not receive any PROBE message from either of them (and hence does not send any BEACON), whereas it was receiving PROBEs earlier when I didn't specify the topology this way. I created some alternate version of the .nss file manually with bit error rate between 1 and 2 set to 1, and that between 0 and 1 set to 0, but that doesn't work, either. Can anyone please throw some light on why it is happening?
Bibudh Lahiri Graduate Research Assistant Department of Electrical and Computer Engineering Iowa State University http://www.ece.iastate.edu/~bibudh/
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