Affiliations: Department of Information and Communication
Engineering, Fukuoka Institute of Technology (FIT), 3-30-1 Wajiro-Higashi-ku,
Fukuoka 811-0295, Japan
Abstract: The problem of congestion control in wireless sensor networks is
very important, especially in very dense networks. In this work, we use a
simple packet repetition scheme as congestion and event-reliability control. In
contrast to other works on the performance study of such a scheme, we use a
random radio pathloss model. We are motivated by this choice, because the radio
model usually used in most of studies on wireless sensor networks is
deterministic. However, this is not the case encountered in real hardware.
Here, we show that the analysis of such a scheme by simulation is not trivial
when more realistic radio models are used. We emphasise this problem by
comparing the differences of simulation results with respect to the non random
pathloss case, also known as isotropic model. As expected, simulations confirm
that radio irregularities can not be neglected and the efficiency of
event-reliability based congestion control should be properly revised. This
aspect calls for new mechanisms of coordination among sensor nodes.
