Improving cooperative caching in Autonomic Wireless Mesh Networks .

摘要

Wireless Mesh Networks (WMNs) can be used where wired infrastructure is uneconomical or impractical to deploy for broadband wireless Internet connectivity. WMNs, with their abundant computational resources in the form of mesh routers (MRs), suffer from gateway bottleneck effects due to the nature of traffic patterns. To mitigate this problem, we study data caching techniques with emphasis on dynamic cooperative caching. In cooperative caching, the cache replacement policy is paramount to the performance of the caching scheme used. The cache replacement policies often replace a valid data item in the cache space. Inspired by the autonomic networking paradigm, we propose and evaluate Autonomic Mesh Cache (AMC) for Wireless Mesh Networks (WMNs). AMC is a scheme that improves data accessibility by alleviating the gateway bottleneck using the cross layer design optimizations. We also propose a CacheRescue scheme to salvage the valid data items. The simulation results show that our proposed approach improves the caching performance when compared to other cooperative caching solutions.