Abstract: Smart mobile devices are playing a more and more important part in people’s daily life. However, the pursuit of increasing performance of mobile devices directly conflicts with the limited battery capacity. The inevitable contradiction between them begins to block the development of smart mobile devices. To overcome this limitation, the heterogeneous multi-processor architecture can balance the user experience and the energy consumption on smart mobile devices, which makes it become a new solution. Based on a compartmental QoE model, a schedule mechanism called XOS oriented heterogeneous multi-processor devices is presented to provide a high energy efficient solution. In XOS, the user interaction tasks are recognized by the operating system based on the cross-layer information, and more computing resources are allocated to these tasks to guarantee the quality of experience, while resources would be limited for other tasks to reduce energy consumption. A simulation system is built to verify the effectiveness of the XOS model and then make a reasonable optimization. Then the implementation and the experiment of the XOS are conducted on Odroid-XU3 board with Android operation system. The result shows that the tasks scheduled by XOS decelerate lessens 2.7%~7.3% QoE lost, whereas they reduce 8%~48% energy consumption at the same time.

Key words: smart mobile devices, heterogeneous multi-processor (HMP), quality of experience (QoE), energy consumption optimization, schedule mechanism, cross-layer information