Research On Key Technologies Of VANET Routing Optimization Based On Named Data Networking

With the rapid development of Intelligent Transportation System,users are paying more attention to issues such as reliable data transmission and system intelligence in mobile scenarios.Among them,V2V(Vehicle-to-Vehicle),V2I(Vehicle-to-Infrastructure)and VANET(Vehicle Ad Hoc Network)based on wireless communication technologies have become important parts of the Internet of Vehicles and hot research topics in the field of Intelligent Transportation.In recent years,with its flexibility and vehicle autonomy,VANET has become the research focus of the Internet of Vehicles System.Due to its fast node moving speed and continuous change of network topology,VANET based on traditional IP architecture is hard to meet the reliable communication requirements under mobility conditions.NDN(Named Data Networking)adopting data name indexes instead of IP addressing possesses the characteristics of using data names as information retrieval methods,distributed in-network caching and mobility support,whose mobility support is better than that of IP networks.However,NDN is centered on the data itself not the data transmission link attributes.Considering all communication processes as data exchange processes,it cannot provide differentiated network services according to the differences in data service flows.In addition,due to the presence of highly mobile vehicle nodes in the network topology,the data transmission path may be broken,causing the intermittent interruption of network transmission and even data loss,which affects network QoS(quality of service).Based on NDN's VANET network architecture — V-NDN(Vehicular Named Data Networking),this thesis studies the multi-constrained optimization for different services and the reliable data packet transmission in V-NDN.The main content is arranged as follows:The basic theories of Internet of Vehicles Technology and NDN are described,including NDN architecture,data naming mechanism,Interest/Data packet format,data forwarding and caching methods,main routing protocols,mobility support,VANET features,and the advantages of NDN in VANET.A multi-constrained QoS routing method based on ant colony optimization is proposed.The method sets different constraint conditions according to the types of services in the NDN.Then,it adopts ant colony optimization to select appropriate transmission paths for different types of services and meet the constraints simultaneously.The simulation results show that this method can achieve better service differentiation and effectively support the QoS of NDN.A data packet backhaul method based on cluster routing in V-NDN is put forward.Forthe data packet backhaul path breakage caused by node mobility,this method combines RSUs in road segments into clusters and utilizes Kalman Filtering model to predict the future access point,thereby delivering the Data packet to the subscriber through a cluster where the future access point is located.Simulation experiments demonstrate that the proposed method has good performances such as low latency and low packet loss rate.Finally,the research on QoS support and routing optimization based on complex road conditions can be the next research target in the V-NDN field.