Abstract
In mobile ad hoc network, the existing replication technique and multiversion scheme increase the cost of overhead. In addition, there is possibility of mobility- and energy-related issues. In order to overcome these issues, in this paper, we propose a hierarchical replication and multiversion concurrency control model for mobile database systems. In this technique, cluster heads (CHs) are selected based on the distance from the past node movements. When the client raises a query, the database server distributes the replicated data to the nearer cluster heads. When any CH observes that one of its members is about to move, then it suggests the nearest cluster having the same data object to the moving client, so that it can quickly access the data during its movement. For concurrency control, each CH maintains a concurrency table for each of its replicated data object. By simulation results, we show that the proposed technique reduces the overhead and energy consumption.
Published Version
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