Research On Data Distribution And Cache Mechanism In Vehicular Named Data Networking

Vehicular Named Data Networking(VNDN)is a new type of network that applies Named Data Networking to the environment of Vehicular Ad hoc Networks which plays an important role in the field of intelligent transportation.VNDN can solve problems of intermittent communication links and frequent link interruptions caused by the constantly changing topology and the rapid movement of nodes in the vehicular network.Therefore,focusing on the research of data distribution and caching mechanism in VNDN,this paper designed a data-centric transmission mechanism that could adapt to highly dynamic Vehicular Ad hoc Networks scenarios.Experimental results showed that this method could not only effectively improve the efficiency data of transmission but also reduced the data redundancy.The specific research contents of this article are as follows:(1)This paper conducted a classification study on the forwarding strategy in VNDN and summarized its communication characteristics.With urban roads as the main traffic scenario and a comprehensive consideration of factors such as geographic location information,vehicle node density and the activity of vehicle nodes,this paper designed a VNDN data forwarding strategy based on density division.The strategy could adaptively select forwarding strategies for different vehicle density scenarios.(2)To solve problems of insufficient cache space and data redundancy in the VNDN network,this paper proposed a two-dimensional data caching strategy that included two parts:a cache replacement strategy based on content service evaluation values and a cache decision strategy based on relational degree.The latter built a model through two dimensions of nodes and contents,calculated the relational degree between thees two influencing factors,and continued to determine whether the vehicle node cached the content.When there was insufficient cache space of the node,it would calculate the service evaluation value of the content through the cache replacement strategy,and would replace the data of the minimum service evaluation value in priority.This paper compared and analyzed the forwarding strategy and cache strategy proposed through the Co-simulation of ndnSIM and SUMO.The simulation result indicated that the algorithm presented in this paper had made a large difference.It could not merely enhance the interest satisfaction ratio,but also increase the network throughput.At the same time,it could reduce the average network delay and network overhead.And even,on the basis of ensuring the cache ratio,the overall network performance is improved significantly.