Abstract:

[Objective] Aiming at the problems in the Vehicle Social Network (VSN), such as large cache redundancy and low efficiency, two strategies related to cache decision and cache replacement adapting to the dynamic VSN are proposed. The fast response to user-requested content is realized through the in-network caching, which satisfies the real-time needs of passengers for data, and provides valuable reference for subsequent research on the cache mechanism in the Content-Centric Vehicule Social Network. [Scope of the literature] This paper focuses on the architecture design of Information-Centric Networking (ICN), the caching mechanism of ICN and VSN, and the researches of combining both. [Methods] Firstly, this paper uses the real-time monitoring of the popularity of cached content and the evaluation of the friendship among nodes as the basis for judging whether to cache the content. Then, the content storage is divided to increase the diversity of the cache. Finally, a cache replacement strategy is formulated based on the importance of the nodes. [Results] The cache strategy designed in this paper significantly improves the response efficiency of interest packets and avoids the loss caused by frequent switching. At the same time, under the premise of ensuring the packet delivery rate, the network overhead is greatly reduced. [Limitations] Due to the limitation of reality implementation, it is impossible to carry out the experiment in real environment, leading to overly ideal experimental results. [Conclusions] Applying ICN technology to VSN can effectively use the characteristcs of content and position separation, which can better support terminal mobility. Also the advantages obtained from in-network caching mechanism reduce network latency and achieve rapid content delivery.

Key words: vehicule social network, information-centric networking (ICN), in-network caching, content popularity, cache replacement