Research On Routing Optimization Of Underwater Sensor Networks

Underwater Wireless Sensor Network(UWSN),as a brand-new way,provides help for humans to obtain information about the underwater world and explore underwater resources,and has become a current research hotspot.Compared with the terrestrial environment,the underwater environment has higher complexity,including high communication delay,low communication bandwidth,prone to routing holes,and limited energy of underwater equipment,which is difficult to charge.This is a major challenge for routing in underwater environments.Proposing and designing reliable and efficient cavity avoidance algorithms and underwater wireless sensor network protocols has become the key to improving the reliability and energy efficiency of underwater sensor networks,and is also a necessary guarantee to meet various needs in the underwater environment.Opportunistic Routing-OR(Opportunistic Routing-OR)method is often used in environments with poor communication quality,which helps to improve the reliability of data transmission.However,in order to better apply the idea of opportunistic routing,it is necessary to provide more rigorous hole processing algorithms according to the characteristics of underwater sensor networks.The main work of this paper includes:(1)A hole avoidance algorithm,PCAMAR,which combines periodic beacons,power control and mobility assistance techniques,is proposed.The void problem of underwater wireless sensor network is studied.For the routing holes existing in the network,the periodic beacon is used to obtain the hole state of the node.The node uses the beacon information to obtain its own state,and uses the power control method to obtain the appropriate power level.Finally,when there is still a hole,the node moves The auxiliary method adjusts the depth of hollow nodes to change the network topology and improve network connectivity.The experimental simulation shows that PCAMAR can effectively improve the network connectivity rate under the condition of fixed number of nodes and transmission range.(2)An opportunistic routing protocol EE-AVAOR based on depth information with a hole avoidance mechanism is proposed.Aiming at the characteristics of high mobility,high complexity and poor quality of communication links in 3D un-derwater sensor networks,a fitness factor TDPA is proposed to balance the node transmission distance,node transmission energy consumption and node residual energy,and based on the idea of opportunistic routing,using the hole avoidance method PCAMAR proposed in this paper to propose the protocol.The protocol adopts an adaptive transmission method,that is,in a network with better communication quality,it adopts the idea of opportunistic routing,uses a heuristic method to save node energy,and broadcasts data in a network with poor link quality to ensure the success rate of network transmission.This paper simulates and analyzes the EE-AVAOR protocol,and compares it with three mainstream underwater routing protocols in recent years.Experimental simulations show that this routing protocol can effectively improve network lifetime,network reliability and network utilization.