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Reliability Analysis of a Redundant Database for UMTS Systems.

Palazzo, S.; Puliafito, A.; Scarpa, M.

In: Proceedings of the Seventh International Workshop on Petri Nets and Performance Models, June 3-6, 1997, Saint Malo, France, pages 247-256. Los Alamitos, California: IEEE Computer Society, June 1997.

Abstract: The Universal Mobile Telecommunication System (UMTS) is anticipated to provide mobile users with new broadband services such as wireless mulitmedia, including real-time video and high-speed data. In this system, 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 availability. In this paper we present a Petri net based model that allows us to analyse a minimally replicated DDB in which different strategies for the replication of user data are adopted. The analysis of the effects of faults in nodes at different levels in the structure is carried out and some scenarios with replicated data are also evaluated.

Keywords: Mobile systems; Distributed databases; Petri nets; Dependability.

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