Design and evaluation of a replicated database for mobile systems

The new generation mobile systems are anticipated to provide mobile users with new broadband services such as wireless multimedia, including real‐time video and high‐speed data. In these systems, the requirement on service transparency placed by the handling of mobility, both personal and terminal, implies a remarkable increase in the complexity of data management. Therefore, appropriate distributed databases (DDB) must be designed to guarantee speed in the processing and updating of user information, and a high level of reliability and performance. In this paper we analyze a minimally replicated DDB in which different strategies for the redundancy of user data are discussed. First, we develop a Petri net based model in order to analyze the consequences on dependability deriving from faults in nodes at different levels in the DDB structure. Then, we investigate the performance offered by the system through a queueing network model. The measures of interest include reliability, availability, mean time to failure, and mean response time to service access.

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