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Information access and QoS issues in a mobile computing environment

Efficient access to coherent information files is an important issue in mobile computing. In this paper we consider performance analysis of information access in a mobile computing environment. We employ a distributed directory scheme that permits uninterrupted use under disconnected and low bandwidth connections and minimizes invalidation and false sharing. This scheme allows for two invalidation schemes that avoid false sharing, and a mechanism for efficient maintenance of file details. We analyse the performance of the directory scheme in terms of time taken and energy consumed in executing operations such as read/write, connection, disconnection, and hoarding in mobile environments. The directory scheme is employed for facilitating efficient transfer of partially updated files in hierarchical networks. We also investigate quality of service issues related to file accesses in the mobile computing environment discussed in the paper. However, the scheme can be extended to any mobile computing environment.