Routing Protocol Optimization For Vehiclar Ad Hoc Networks Based On Particle Swarm Optimization Algorithm

As a typical mobile ad hoc network,vehicular ad hoc networks are widely used in the fields of vehicular interconnection and vehicular Internet of things.Highly reliable routing protocol is the technical support for vehicular ad hoc networks to communicate with each other under the condition of more changes and no infrastructures,which is used to ensure the safe driving of vehicles under various communication scenarios and reduce the incidence of traffic accidents.This thesis mainly uses particle swarm optimization algorithm to optimize the typical routing protocols of the vehicular ad hoc networks to improve the reliability and efficiency of those protocols.This thesis,firstly,proposes a routing protocol based on particle swarm optimization for vehicular ad hoc network against the greedy forwarding process of the routing protocol based on location for vehicular ad hoc network.Then analyzing the routing hole problem exists in the vehicular ad hoc network based on particle swarm optimization and proposes the optimization strategy.Finally,a routing protocol based on optimized link state for vehicular ad hoc network is studied and analyzing the important parameters of it,and the parameters configuration optimization framework based on PSO and simulation tool is proposed.The work of the thesis is mainly reflected in the following three aspects:Firstly,in view of the lack of consideration of node energy consumption,boundary node susceptible to be interfered and serious packet loss under the greedy forwarding mode,this thesis proposes a P-GPSR routing protocol based on particle swarm optimization for vehicular ad hoc networks,using particle swarm optimization algorithm to iteratively search for the best next hop node in greedy mode.Secondly,in view of the problem of routing holes in the process of perimeter forwarding for P-GPSR routing protocol in vehicular ad hoc networks,the thesis introduces the node deflection rate and next hop forwarding region density to optimize the forwarding process for P-GPSR protocol.Thirdly,considering the different communication efficiency of vehicular ad hocnetworks in different mobile scenarios,the important parameters that affect the operation efficiency of the vehicular ad hoc network OLSR routing protocol are studied,and the parameter optimization framework based on PSO and NS2 is achieved for finding out the optimal configuration of the important parameters of the OLSR protocol under the corresponding mobile scenario.