基于车辆与RSU双向选择的缓存放置算法

Vehicle Ad Hoc Network (VANET) is a new technology, which has been widely used in intelligent vehicle transportation systems in recent years. It provides effective means for vehicle node environmental information perception, road safety early warning, data acquisition and information distribution. However, due to the high degree of network topology changes and the identity and location binding characteristics of traditional TCP / IP network architectures, the development of VANET faces many challenges. In order to improve the information acquisition performance of the Vehicle Ad Hoc Network, this article applies the Information Center Network (ICN) architecture to the VANET. Based on the analysis of the existing cache strategy of the ICN, we thoroughly studied how to improve the cache hit rate of hot content while improving the cache redundancy in the network. A cache strategy based on the two-way selection of RSU and vehicle is proposed. During the pre-cache stage, this strategy uses the historical request data of the vehicle to build a pre-cache decision tree, which caches content in a suitable RSU; in the R2V phase, logical clustering is performed based on the differences in the node\'s interest requests, and the stability indicators of the nodes in the network are derived by referring to three traffic flow theories and real data set analysis to improve the overall network performance. Finally, this paper analyzes the performance of the proposed cache strategy and verifies the effectiveness of the cache strategy.