Contributions to Real Time Scheduling for Energy Autonomous Systems.

Abstract : Nowadays, renewable energy harvesting such as that envisaged for many wireless things, allows the quasi-perpetual systems operation without human intervention because it works without periodic recharging of battery. From an energy point of view, the design of this type of autonomous system becomes more complex since this process has in addition a behavior constrained by time, and particularly has to meet latest timing deadlines. As with any real-time system, an unavoidable problem is to find a dynamic scheduling mechanism able of considering jointly two key constraints: time and energy. In this thesis, we focus on scheduling of mixed tasks consisting of periodic tasks and soft aperiodic tasks without deadline, by providing appropriate solutions for the following question: how to serve aperiodic tasks in order to minimize their response time without challenging the feasibility of periodic tasks. We consider a single-frequency uniprocessor system, powered by an energy reservoir which is charged through an ambient energy source. In this context, four new aperiodic task servers were proposed, based on the optimal scheduler ED-H. A theoretical analysis was performed with validation by a simulation study.
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Rola Osta. Contributions to Real Time Scheduling for Energy Autonomous Systems. . Embedded Systems. Université de Nantes, 2017. English. ⟨tel-01636870⟩

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