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Abstract Distributed protocols executing in uncerta Distributed protocols executing in uncertain environments, like the Internet, had better adapt dynamically to environment changes in order to preserve QoS. In earlier work, it was shown that QoS adaptation should be dependable, if correctness of protocol properties is to be maintained. More recently, some ideas concerning specific strategies and methodologies for improving QoS adaptation have been proposed. In this paper we describe a complete framework for dependable QoS adaptation. We assume that during its lifetime, a system alternates periods where its temporal behavior is well characterized, with transition periods during which a variation of the environment conditions occurs. Our method is based on the following: if the environment is generically characterized in analytical terms, and we can detect the alternation of these stable and transient phases, we can improve the effectiveness and dependability of QoS adaptation. To prove our point we provide detailed evaluation results of the proposed solutions. Our evaluation is based on synthetic data flows generated from probabilistic distributions, as well as on real data traces collected in various Internet-based environments. Our results show that the proposed strategies can indeed be effective, allowing protocols to adapt to the available QoS in a dependable way. to the available QoS in a dependable way.
Author Mônica Dixit + , António Casimiro + , Paulo Verissimo + , Paolo Lollini + , Andrea Bondavalli +
Institution Department of Informatics, University of Lisboa  +
Key Dixit09b  +
Month dec  +
Note  +
NumPubDate 2,009.12  +
Project Project:HIDENETS +
ResearchLine Timeliness and Adaptation in Dependable Systems (TADS) +
Title A Probabilistic Framework for Automatic and Dependable Adaptation in Dynamic Environments  +
Type techreport  +
Url  +
Year 2009  +
Categories Publication  +
Modification dateThis property is a special property in this wiki. 21 January 2013 16:55:36  +
NumberThis property is a special property in this wiki. TR-09-19  +
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