Dynamic Bypassing Void-based Routing For Underwater Sensor Networks

Underwater wireless sensor networks(UWSNs)have a wide range of application scenarios and practical significance in marine-related development,exploration and monitoring.Data transmission in UWSNs is through acoustic waves.So UWSNs feature higher bit error rate,lower data transmission speed,and dynamic changes of topology.Moreover,sensor nodes are deployed in a wide range of water bodies.Recharging the battery is infeasible.During packet routing,the manners to handle network void region is significant to the robustness and performance of UWSNs.Many routing protocols have been proposed,but they either neglect the void region problem or manage to solve it by moving the geographical position of sensor nodes,which consumes extra energy and does not consider the actual underwater situation.In order to handle the void region problem efficiently,this thesis proposes a routing protocol called Dynamic Bypassing Void-Based Routing for Underwater Sensor Networks(DBVR).There are two phases:1.Initial path construction phase: In this phase,a basic routing path under initial network topology are constructed by short-term broadcasting.Because of the broadcast strategy of control packets,the transmission of data packets can bypass the network void and reach the water surface.2.Clustering and dynamic path modification phase: Facing the change of network topology,the nodes will dynamically adjust their paths according to the relative positions of nodes in a same cluster to cope with the impact of ocean currents on the location of underwater nodes.Underwater networks can dynamically change routing paths when network voids occur,so that data packets can be transmitted around void region.The spherical mobility model of underwater node is proposed in this thesis.Through the Aqua-Sim simulation platform,lots of comprehensive experiments have been carried out.Results show that compared with existing protocols,DBVR protocol can achieve higher performance.