The Reliability Performance of Wireless Sensor Networks Configured by Power-Law and Other Forms of Stochastic Node Placement
Mika Ishizuka, Masaki Aida · IEICE Transactions on Communications · 2004
SUMMARY Sensor nodes are prone to failure and have limited powercapacity, so the evaluation of fault tolerance and the creation of technologyfor improved tolerance are among the most important issues for wirelesssensor networks. The placement of sensor nodes is also important, sincethis affects the availability of nodes within sensing range of a target in agiven location and of routes to the base station. However, there has beenlittle research on the placement of sensor nodes. Furthermore, all researchto date has been based on deterministic node placement, which is not suit-able when a great many sensor nodes are to be placed over a large area. Insuch a situation, we require stochastic node placement, where the sensor-positions are in accord with a probability density function. In this paper,we examine how fault tolerance can be improved by stochastic node place-ment that produces scale-free characteristics, that is, where the degree ofthe nodes follows a power law. key words: sensor network, node placement, fault tolerance, power law