System-Wide Dynamic Power Management for Multimedia Portable Devices

Energy reduction is critical to increase the mobility and battery life for today’s pervasive computing systems. At the same time, energy reduction must be subject to the realtime constraints and quality of service (QoS) requirements for multimedia applications running on these systems. This paper presents a novel run-time scheduling approach to reduce the system-wide energy consumption for such systems. In this paper, the multimedia applications are modeled using a popular weakly hard real-time model, i.e., the (m,k)-model. Our experimental results show that, by judiciously scheduling the real-time tasks and shutting down the processor and/or peripheral devices, our approach can lead to significant energy savings while guaranteeing the (m,k)−firm deadlines at the same time.