Research On Competitive MAC Protocol Based On Underwater Mobile Network Scenario

Underwater Acoustic Sensor Networks(UASNs)are an important means to realize the cognition of ocean,ocean development and ocean security,and are research hotspots.Media access control(MAC)technology arranges channel utilization rights for the required nodes and ensures that no collision occurs when transmitting data packets.The underwater acoustic channel has a long time delay and a narrow bandwidth that can be used.The energy of underwater acoustic networks is limited.These issues make it difficult to study underwater MAC protocols.Therefore,in the face of the characteristics of underwater acoustic channels,it is important to design a stable and efficient MAC protocol.This paper is supported by NSFC.This paper analyzes the characteristics of underwater acoustic sensor networks.Combined with the movement behavior of nodes in dynamic network scenarios,it studies the energy consumption and time-space uncertainty in underwater acoustic networks,and designs an underwater MAC protocol for mobile and load change networks.The main research contents of the thesis include:1.The dissertation first analyzes how existing underwater MAC protocols are designed,as well as their excellence and their defects.Aiming at the dynamic communication environment,the competitive MAC protocol has good adaptability and stability.Then,the working principles of Aloha,CSMA and dacap are studied theoretically.Finally,the OPNET platform is used to simulate and analyze the factors affecting network throughput.2.Modeling of mobile network scenarios.Analyze the motion of underwater sensor nodes and establish a node movement model;study the underwater acoustic channel model,and model the propagation delay,signal-to-noise ratio,and bit error rate stages;and finally construct an underwater MAC protocol suitable for dynamic networks desired network scenario.3.Aiming at the problems of the energy limitation of underwater acoustic sensor networks and the short life cycle of nodes,considering the influence of the MAC layer on channel scheduling and communication efficiency,a MAC protocol(PC-MAC)based on power control algorithm was proposed.The protocol dynamically adjusts the transmit power according to the channel environment and the distance between nodes,reduces the energy consumption of data transmission,and achieves the purpose of extending the life of the node.Simulation results show that the PC-MAC protocol significantly improves the energy efficiency of the network.4.Aiming at the spatio-temporal uncertainty of underwater acoustic channels,this paper considers how to improve the channel utilization of the PC-MAC protocol,a MAC protocol(TSPC-MAC)based on joint optimization of space-time multiplexing and power control is proposed.This protocol improves the traditional handshake mechanism,introduces the idea of peer-to-peer transmission,and realizes the opposite transmission of data,thereby improving the channel utilization rate.Finally,by studying the simulation results,we can understand that the TSPC-MAC protocol can make the network work better.