A NOVEL APPROACH TO MEASURING NODE AND ENERGY UNIFORMITY FOR THE OPTIMAL ASSIGNMENT OF DIRECTIONAL SENSORS

One of the prevalent methods to increase the network lifetime is to develop the uniformity in the sensor node distribution and load balancing. The existing criteria to calculate the uniformity are only able to locally or globally measure the uniformity of sensor distribution in the network. In this paper, a new criterion is proposed for the uniformity measurement of sensor distribution. The criterion can calculate the both global and local uniformity in various levels of node distribution. In addition, using the model of sensing area of each sensor, this criterion has been generalized for the uniformity of sensors energy distribution in the network via calculating the uniformity of sensor node distribution. In order to assess the performance of the proposed criterion, a set of sensor distribution patterns has been utilized; also, the uniformity calculation results of these patterns have been studied. Then, a method for the sensor assignment has been proposed in a network, in which sensor nodes have the possibility of rotation and a coverage area is selected. This method enhances the energy distribution uniformity in the network. The comparison is finally provided among the perceived results to show an acceptable performance of the proposed method.