Date Added: Feb 2011
In this paper, the authors investigate the coverage of mobile heterogeneous Wireless Sensor Networks (WSNs). By the term heterogeneous, they mean that sensors in the network have various sensing radii, which is an inherent property of many applied WSNs. Two sensor deployment schemes are considered - uniform and Poisson schemes. They study the asymptotic coverage under uniform deployment scheme with i.i.d. and 1-dimensional random walk mobility model, respectively. They propose the Equivalent Sensing Radius (ESR) for both cases and derive the critical ESR correspondingly. From the perspective of critical ESR, they show that 1-dimensional random walk mobility can increase coverage under certain delay tolerance, and thus decreases sensing energy consumption.