TitleQuality of service control in soft real-time applications
Publication TypeConference Paper
Year of Publication2003
Conference NameProc. IEEE Int. Conf. on Decision and Control
Publication Languageeng
AuthorsPalopoli, L, Cucinotta, T, Bicchi, A
KeywordsEmbedded Control, Robotics

In this paper we present results obtained in the context of Quality of Service (QoS) control for soft real-time applications. The discussion addresses the issue of dynamically adjusting the bandwidth for a set of periodic tasks, when a reservation-based (RB) CPU scheduling policy is used. RB techniques are particularly suitable for this kind of applications since they allow an accurate mathematical modelling of the dynamic evolution of the QoS experienced by tasks. Based on this model, a control policy guaranteeing specified QoS levels for different tasks is illustrated, along with necessary and sufficient conditions for its existence. Moreover, the problem of steering a task QoS back into its nominal level is tackled, in response to deviations due to temporary overload conditions. Simulation results are reported, for the purpose of validating the approach.

PDF icon [PDF]113.4 KB