Research On Multi-Hop Link Optimization Method And Routing Algorithm For Urban Vehicle Networking

In recent years,with the development of road transportation,there is a dramatic growth of vehicles in the urban environment.In the case,the traffic environment becomes more and more volatile,the information dissemination between vehicles is becoming more prominent.Intelligent Transport Systems(ITS)are rapidly gaining popularity as efficient traffic management systems.Vehicle Ad-hoc Network(VANET)is taken as an important component of ITS applications,which provides safe and effective communication on road traffic.Due to the complexity and variability of road conditions,the transmission of the information is timesensitive and needs to take into account security issues.To provide a reliable and effective traffic environment,the demand for inter-vehicle information transmission should be extremely low transmission delay and high reliability.Hence,developing an effective and dependable transmission approach to guarantee communication quality is a key research focus in the realm of vehicular networking.The primary contents of this thesis are as follows:First,an overview of the basic theories related to the Internet of Vehicles.It includes the basic concept,characteristics,and the corresponding routing algorithms.Second,for the demand for low latency and high reliability of vehicle communication in urban intersections,the latency and BER of vehicle information transmission are selected as important indexes and a utility model is proposed to realize the performance evaluation of both latency and reliability of vehicle communication links.A Pareto-based link optimization algorithm(PLOA)is proposed based on delay and reliability utility functions.The numerical simulation results show that the proposed PLOA can select suitable links to transmit reliable information with very low latency,and it effectively improves the network utility of vehicular networking.Third,in vehicular networking,the high-speed moving vehicles are mainly used as communication nodes,and thus the vehicular network topology changes rapidly.Taking into account the stability of bus routes,large communication coverage,and strong data processing capability of buses under urban circumstances,an energy-efficient bus-based clustering routing algorithm(EBCRA)is proposed.The proposed algorithm firstly considers the degree of nodes,the mobile similarity of vehicles,and transmission energy consumption in order to cluster the vehicle nodes on the road.And then,the proposed algorithm makes full use of the advantage of buses to select the bus as the cluster head in preference.The dynamic allocation of clustering heads,cluster members,and gateway nodes are varied by changing road conditions to reduce fast links and network connections to ensure urban road connectivity while reducing energy consumption.The numerical simulation results show that EBCRA can better balance the consumption of vehicle energy while ensuring road connectivity,reduce the speed of node death effectively,and improve the performance of routing transmission greatly.