Scheduling method fork Real-Time Mobile Transactions Using Execution Window

초록

In this paper we present a transaction scheduling method using execution window for real-time mobile transactions in mobile computing environments. The proposed method checks whether a transaction is executable or not. It is able to by considering not only the deadline of real-time transaction but also the validity of real-time data in mobile hosts. And then, ig schedules the real-time mobile transactions by making optimal execution window based on the priority queue, while considering the transaction value and deadline. Disconnection with mobile hosts is monitored in selecting the transaction for execution. Using the proposed method reduces the number of restarting times after transaction abort which is caused by the violation of the validity constraints of real-time data. And it has merits of maximizing the sum of the values of real-time mobile transactions which meet the deadline. The performance evaluation demonstrates that the number of committed real-time transactions within the deadline is improved by 20%. This method can be used in real-time mobile transactions in such environments as cellular communicatios, emergency management information systems and so on.