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A Dynamic File Allocation Policy for Reliable and Real-Time Mobile Information Systems ∗

Recent advances in wireless communication technology have made dynamic file allocation in mobile networks an important issue. In particular, our objective in this paper is to provide reliable and real-time information services in mobile computing environments. We have proposed a twophase dynamic file allocation strategy to best satisfy the critical reliability and query response time requirements in distributed mobile database systems. This strategy consists of two phases: 1) periodically generating optimal file allocation via a heuristic algorithm based on the complete system state information and 2) knowledge-based file reallocation based on limited system state change information. Using this strategy, the file allocation can be dynamically reconfigured and adapt to system needs to provide reliable and real-time mobile database services.