Research On Power Control And Coverage Optimization Based On SDWSN

In wireless sensor network(WSN),the power control and coverage optimization problem are very important,but the traditional WSN can’t achieve the global optimization when optimizing the power and coverage problem according to the local information.The emergence of software defined network(SDN)provides a new idea for the development of WSN.At present,scholars have introduced SDN architecture into WSN and proposed software defined wireless sensor network(SDWSN).In SDWSN,the control layer is separated from the data layer,and the controller has the global view of the network,which can flexibly control the power and flow distribution of the nodes in the whole network,so as to achieve the global optimization of the network state.This dissertation improves the existing SDWSN architecture,and studies the power control and coverage based on the improved SDWSN architecture,which breaks the limitations of the traditional WSN architecture in global optimization.The main contents are as follows:1、In order to adjust the transmitting power of sensor nodes,reduce data redundancy and communication interference on the basis of ensuring network connectivity and coverage,and reduce network energy consumption,a power control algorithm based on non-cooperative game in SDWSN(SDWSN-PC)is proposed.The whole sensor network is abstracted into an undirected graph.Each node plays the game as a participant,and the game process is carried out in the controller.The controller under SDWSN architecture has a global view,which can comprehensively consider the residual energy,transmission power and path hops of nodes based on the global information.On the premise of ensuring network connectivity and coverage,it can find the most appropriate transmission power for each node,so as to save the energy consumption of the whole network.The simulation results show that compared with other power control algorithms based on game theory,SDWSN-PC algorithm has more balanced energy consumption and prolongs the network life cycle.2、Aiming at the coverage hole caused by node energy depletion and external factors,a WSN coverage hole repair algorithm based on SDN(SDWSN-CHR)is proposed,which can repair the hole and ensure the perceptual performance of the network.Firstly,under the SDWSN architecture,the monitoring area in each cluster of the data plane is divided into cells of equal size,and the coverage of cells is detected based on the binary sensing model.Then,in order to improve the efficiency of coverage hole repair,the combination of sleep scheduling and mobile node repair is used to repair the coverage hole.First find the sleep node that can cover the hole area,wake it up,and then update the hole information.The mobile node moves periodically to ensure the collection of updated hole information.The linear programming algorithm is used to plan the mobile path of mobile nodes,so as to minimize the sum of mobile distances on the premise of ensuring the coverage.According to the generated mobile path,the mobile node accesses the target locations in the path in order to realize data collection.Simulation results show that compared with other coverage hole repair algorithms in wireless sensor networks,SDWSN-CHR algorithm has lower complexity and shorter time.Moreover,due to the management flexibility of software defined architecture,SDWSN-CHR algorithm can adapt to the dynamic changes of coverage holes and adjust the mobile route in real time.Figure [13] Table [4] Reference [25]...