An Effective Cooperative Caching Scheme for Mobile P2P Networks

Mobility, resource constraints and unreliable wireless links of mobile P2P networks will cause high data access latency and the communication overhead. Cooperative caching is widely seen as an effective solution to improve the overall system performance in mobile P2P networks. In this paper we present a novel cooperative caching scheme for mobile P2P networks. In our scheme the caching space of each node is divided into three parts: locale caching, cooperative caching and path caching, which respectively store the requested data objects of the nodes, the hot data objects in the networks and the data objects path. We also put forward the cache replacement strategy according to our scheme. Proposed cache replacement strategy not only takes into account the need of the nodes, but also pays attention to collaborative work between nodes. We evaluate the performance of our scheme by using NS-2. The experimental results show that the cache hit ratio is effectively increased and the average hops count is reduced.