Regular Paper A Ubiquitous Power Management System to Balance Energy Saving and Response Time based on Device- level Usage Prediction

Power conservation has become a serious concern during people’s daily life. Ubiquitous computing technologies clearly provide a potential way to help us realizing a more environment-friendly lifestyle. In this paper, we propose a ubiquitous power management system called Gynapse, which uses multi-modal sensors to predict the exact usage of each device, and then switches their power modes based on predicted usage to maximize the total energy saving under the constraint of user required response time. We build a three-level Hierarchical Hidden Markov Model (HHMM) to represent and learn the device level usage patterns from multi-modal sensors. Based on the learned HHMM, we develop our predictive mechanism in Dynamic Bayesian Network (DBN) scheme to pre-cisely predict the usage of each device, with user required response time under consideration. Based on the predicted usage, we follow a four-step process to balance the total energy saving and response time of devices by switching their power modes accordingly. We use PlaceLab data set to evaluate Gynapse, and the preliminary results demonstrate that Gynapse has the capability to reduce power consumption while keeping the response time not exceed user require-ment, which provides a complementary approach to previous power manage-ment systems. 1