Device-Centric Low-Power Scheduling for Real-Time Embedded Systems

Existing low power schedules mainly try to decrease overall system energy usage by shutting down unused devices after process scheduling. This often leads to suboptimal energy usage due to the lack of process slack time to shut down unused devices in a fixed system schedule such as that generated by a rate-monotonic or an earliest deadline first scheduler in a real-time embedded system. In this work, we try to integrate process scheduling with low power scheduling such that a low-power real-time feasible schedule is obtained. The proposed method called Low-Power QuasiDynamic Scheduling (LQS) was implemented and applied to some examples, including a sensor network node and Bluetooth devices, to prove its benefits.