A New Angle Coverage Scheduling Optimization Method for Heterogeneous Nodes in Directional Sensor Networks

An important issue in directional sensor networks is how to prolong the network lifetime when the coverage requirement is met in angle scenarios. To address this problem, this paper proposes a new angle coverage scheduling optimization method (NACSOM) for heterogeneous nodes. In this method, a coverage-enhancing algorithm of nodes with unadjustable coverage angle is first devised to improve the coverage ratio. For the uncovered angle, a hole-repairing algorithm of nodes with adjustable angle is proposed to repair the coverage hole and achieve the full-angle coverage. To achieve the constant scheduling, a sustainable multi-round angle coverage scheduling algorithm is developed to prolong the network lifetime when the coverage ratio is maximized. Simulation results demonstrate that our method has better performance in real situations.