01394nas a2200157   4500008004100000245006200041210006100103300001200164520088300176653002101059653001301080100001601093700001701109700001501126856009501141       2003                        eng d00aQuality of service control in soft real-time applications0 aQuality of service control in soft realtime applications  a664-6693 a<p>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.</p>
10aEmbedded Control10aRobotics1 aPalopoli, L1 aCucinotta, T1 aBicchi, A.  uhttp://95.110.227.16/publications/quality-service-control-soft-real-time-applications.html