The Key Technology Of Topology Control In Underwater Acoustic Sensor Networks

With the increasing development and utilization of the ocean,the Underwater Acoustic Sensor Networks have been concerned by people from all walks of life.The complex acoustic environment results in underwater acoustic channels with limited bandwidth,high latency,high bit error rate,and dynamic changes of nodes locating.All of them pose significant chal enges to the topology control.Topology control is not only the basis of the design of layered protocols,but also a key factor that affects the communication efficiency of the network directly.In this paper,two aspects of research on topology control of underwater acoustic sensor networks are carried out: topology construction and topology maintenance.For the topology construction,an environment-friendly underwater gateway deployment(EF-UGD)strategy is designed to avoid the acoustic interference to marine mammals while maximizing the delay performance and reliability of networks.However,due to the dynamic characteristics of underwater acoustic channels,a link disruption recognition and glider-scheduling algorithm(LDR-GS)is designed,which enables the network to autonomously maintain the topology of the network in the subsequent stage,so that the network can meet the performance requirements of the network within a limited time.The performance of the topology construction and topology maintenance algorithms is verified by experimental simulation.The results show that the EF-UGD algorithm proposed in this paper can effectively reduce the average end-to-end delay of network and improve the data packets delivery rate of network on an environment-friendly basis.With LDR-GS,the reliability and energy efficiency of networks are guaranteed.The data packet delivery rate is improved by 15% and the communication energy consumption is decreased by 20%.Moreover,the repair of different interrupted links is more universal.The proposed topology construction and maintenance method provides some theoretical and practical significance for the topology control of underwater sensor networks.