A Coordinated Cache Data Placement Scheme for Mobile Ad hoc Networks

The idea of sharing caches among neighboring nodes is an important technique to improve data access efficiency in mobile ad hoc networks. This paper introduces a new coordinated cache data placement scheme combined with cache replacement ideally suited for mobile host with limited memory. In particular, we propose a coordinated data placement scheme that eliminates redundant data stored in multiple neighboring nodes by assuring that a copy of the data will be present in the cooperate cache. We use the concept of cached object's eviction period to measure the contention of caches. The proposed cache data placement scheme based on eviction period reduces replication of data without any extra communication overhead. The simulation results show that the proposed scheme yields better performance in terms of cache hit ratio and average latency compared to independent cache data placement.