Cooperative Caching with Adaptive Prefetching in Mobile Ad Hoc Networks

In this paper, we propose a cooperative data caching and prefetching scheme for mobile ad hoc networks (MANETs). In this scheme, multiple hosts cooperate in prefetching and caching data. Clustering architecture was used for network organization. A weak consistency based on time to live value was used to maintain data consistency. A hybrid cache replacement policy that uses the frequency of access and reference time was employed. The effects of various parameter settings on the performance metrics such as data accessibility, query delay and network traffic overhead were investigated in a simulation environment. The proposed integrated cooperative caching and prefetching scheme was compared with cooperative caching without prefetching. The simulation results indicate that the proposed scheme improves both data accessibility and query delay at relatively lower prefetch thresholds and larger cache sizes