Improving Data Availability in Vehicular Ad Hoc Networks Using Fuzzy Logic Caching

Vehicular ad hoc networks are a type of networks in which adjacent vehicles communicate wirelessly and intelligently with fixed roadside infrastructure. Caching is a process of replicating and locating data for future quick access. It is a proper method for problems that cause weak data availability. Caching frequently accessed data on the client cache is an effective technique to improve performance in a mobile environment. It can reduce traffic and data access delay and disseminate a load of overloaded servers to client caches. Also, when there is no place to store new data items in the cache, a data replacement policy should be applied in the cache. A new caching and replacement method based on fuzzy logic for vehicular ad hoc networks is proposed in this paper. The goal of this method is to increase nodes cache hit rate and data access. This means that instead of locating all information on RSUs, client nodes save important data on themselves caches and share cooperatively with each other. The results of simulations with MATLAB software shows that the proposed method increases the cache hit rate 15% and delay 23% in comparison with related works.