Relaxed Atomic Commit for Real-Time Transactions in Mobile Computing Environment
WAIM '02 Proceedings of the Third International Conference on Advances in Web-Age Information Management
Location-dependent query processing under soft real-time constraints
Mobile Information Systems
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Abstract: Since about a decade, mobile computing technologies have led to the increasing demand for processing real-time transactions by many current applications. These applications are compose d of a large distributed database located on fixed sites and small parts of the database located on mobile hosts (MHs). The MHs and the fixed sites communicate between them via wireless networks. Mobile users often require timely access to information. In this paper, we study how to ensure the continuity of soft real-time transaction computing despite the disconnection problems that often occur between MHs and fixed sites. We propose a soft real-time transaction scheduling protocol, called disconnection tolerance protocol (DT-protocol), that manages efficiently the frequent network disconnections. We focus particularly on query transactions. DT-protocol is based on an extended transaction scheme where controlled transactions deadline overruns and controlled data imprecision are used.