Design And Implementation Of Mobile Charging Strategy In Sensor Networks

Wireless sensor networks play an important role in more and more fields.However,the energy bottleneck has always restricted the further application of wireless sensor networks.To solve this problem,many scholars proposed different solutions,such as sensor energy-saving methods,as well as environmental energy collection and conversion methods.However,the energy-saving scheme is extremely limited to extending the life of the node;the energy collection and conversion scheme is not controllable,and the efficiency of energy conversion is low.None of these solutions fundamentally solves the energy bottleneck of wireless sensor networks.In recent years,wireless charging technology has provided a new idea for solving the problem of energy bottleneck in wireless sensor networks,which is based on the mobile charging scheduling strategy,and uses Mobile Charger(MC)to recharge the sensor node.Mobile charging scheduling strategy is an important part of the wireless charging scheme,and the current mainstream charging scheduling strategy mainly includes periodic charging scheme and on-demand charging scheme.When the mobile charging device MC is planned for the mobile charging path and the time of charging,the shortcomings of above schemes include high waiting delay of the node to be charged,high MC mobile energy consumption,low MC charging efficiency,etc.,which result in some sensor nodes stop to work due to the exhaustion of energy before the MC arrives,and the sensor network can not be guaranteed to operate normally within the expected lifetime.In order to solve the problems of above charging strategy,this paper proposes a mixed charging scheduling algorithm(MCS)based on periodic charging and on-demand charging.Based on the dynamic threshold mechanism,the algorithm adds the node rate packet mechanism to determine the node to be charged;On the basis of the periodic charging loop,the algorithm cooperates with the service station deployment mechanism to construct the charging loop,to guide the MC to wirelessly charge sensor nodes.Under the premise of ensuring the normally operation of all sensor nodes,the algorithm can reduce the total energy consumption of sensor networks as much as possible,and improve the charging efficiency of MC.The simulation results show that the MCS algorithm proposed in this paper has good performance in terms of node waiting latency,energy consumption of sensor network and MC moving distance.On the basis of the proposed MCS algorithm,this paper designs and implements the sensor network mobile charging management system.The system designs the network topology presentation module,which can display the real-time sensor networks distribution and the detailed information of each sensor node by the system web interface;the system designs the sensor state monitoring module to obtain the change of the information data such as the remaining power and energy consumption rate of the sensor node;the system also designs the sensor historical alarm module,to record the name of the alarm node,alarm time and the alarm reason,etc.;the system designs mobile charging scheduling module,which is based on alarm node detailed information,calls the MCS algorithm to construct the mobile charging loop of this round of scheduling,shows MC mobile charging path,and dynamic updates service station deployment coordinates,node grouping,charging threshold,etc.;the system designs user management module,which can modify the user password and personal permissions.The test results show that the system can guide the wireless sensor network energy management and mobile charging,improve network performance.