Cooperative caching for improving availability in Social Wireless Networks

This paper presents a cooperative object caching mechanism for maintaining high content availability in Social Wireless Networks. Most of the existing cooperative caching schemes in wireless networks provide either high network level availability or high node level availability, but not both at the same time. The first one ensures object availability in isolated network partitions and the second one ensures object availability in individual nodes when they are completely detached from the rest of the network. In this paper, we propose a novel cache partitioning mechanism that is able to provide high network level and high node level availabilities at the same time. This scheme reduces the generated network traffic compared to the prevalent schemes in the literature. In addition to computing theoretical bounds for the availabilities and generated traffic, caching performance is evaluated using a detailed ns2 simulation model under static and mobile networks with realistic mobility patterns.