Adaptive Coupling Model of Time Synchronization and Topology Control in Large-Scale Wireless Sensor Networks

In order to solve the problem that topology control and time synchronization is unable to coordinate in dynamic and complex wireless sensor networks (WSNs), the paper researches on the coordinative behavior of topology control and time synchronization in a large-scale WSNs systems from the perspective of nonlinear system dynamics. In this paper, the parameters associated with the network topology and time synchronization are set as the coupling state vector, associated mathematical models among topology coupling strength rate, signal intensity reduction, clock drift and clock delay are given and a topology control and time synchronization model in dynamic and complex sensor network is established. Simulation results show that with increment of network index, the coupling ability of topology control and time synchronization of the proposed mode enhances. Under the condition that number of goal nodes is fixed, the network with shorter tree structure is easier to realize cooperation of topology control and time synchronization. In order to verify the effectiveness of the proposed model, a large scale wireless sensor network with 200 nodes is deployed in campus. The proposed model is applied to realize the optimal deployment of key nodes in the campus. Furthermore, candidate set of these nodes are selected to accomplish coupling cooperation of key goals which verifies reliability of the model and customizable accuracy of control.