Modified Circular Layer Caching in Wireless Sensor Networks

Abstract

The cutback in the energy loss during communicating the sensed data in WSN is needed to support the long term sensor applications.The caching of the data at intermediate nodes offers a good approach to improve the energy efficiency of WSN.In this paper, the Modified Concentric Circular Layer caching scheme is proposed which maintains a sink table to store the Id's of the nodes caching the sensed data.Thus the cached data is retrieved from caching nodes by searching the sink table, leading to reduction in number of queries injected into network to discover the cached data.The proper cache management scheme is used that ensures cache coherence and consistency.The different factors affecting any caching scheme are also analyzed.The simulation results show energy savings ranging from 23% -82% under different scenarios over the already existing scheme.