Research On NDN-based Information Transmission Routing Mechanism In VANETs

VANET(Vehicular Ad-hoc Networks)is a key part of the realization of intelligent transportation systems.It aims to form a network between vehicle and vehicle,vehicle and roadside infrastructure,even vehicle and anything else,so as to provide more intelligent information transmission for vehicle safety,driverless,coordinated traffic management.It is different from the traditional network in the high mobility of the network nodes.The main body of VANET service is the information service and the greatly demand for content sharing.It can be seen that the core of the VANET application is the information,not the physical location of the information storage.While the traditional network is designed for the end-to-end information exchange between the nodes,the change of the node address during the information transmission will interrupt the transmission;Moreover,the high mobility of the vehicle makes it extremely difficult to manage the mobility of the content carried by the vehicle.In the future,the intelligent transportation is highly efficient,reliable,large-scale data request and distribution,the traditional network information data transmission mechanism faces serious technical challenges in the dynamic and extensible.The NDN(Named Data Network)system that came into being revolved around the idea of information-centric and brought new solutions to the VANET.Firstly,this paper studies the architecture of NDN and the current situation of its combination with VANET,and expounds its challenges in the design of routing and forwarding strategy in VANET.Then,aiming at the serious storm of data broadcast and frequent link breakage in NDN-based VANET,proposed a geo-location based routing and forwarding strategy for urban environments,a delay mechanism based on timer is used to control the broadcast storm and the return of information packets is guided by the angular routing recording method.Secondly,the factors of node selection that affect the performance of data forwarding routing in VANET are analyzed comprehensively.In view of the above proposed routing and forwarding strategy based on geographical location information,the factors such as distance,signal intensity and mobility correlation are considered comprehensively.A data forwarding strategy based on fuzzy logic algorithm is proposed to make the forwarding process more stable and reliable.All of the strategies in this article are tested on the simulation platform ndnSIM.The results show that in the VANET V2V(Vehicle-to-Vehicle)scene,compared with the NDN default forwarding strategy and now commonly used timer based forwarding strategies,the proposed routing forwarding strategy has significant optimization in interest satisfaction rate,average hops,average delay and average forwarding times.The performance of the entire network has been greatly improved.