CPU power consumption reduction in android smartphone

Despite the growing popularity of smartphones, it´s extensive power consumption is still now a burning issue. In this regard, we propose and evaluate a system of CPU power consumption reduction which supports Dynamic Voltage and Frequency Scaling (DVFS) and User Driven Frequency Scaling (UDFS) at the same time. At first, a DVFS is used to scale the frequency level continuously based on loads present at that time. Then a UDFS is used to consider user satisfaction. Starting from the highest frequency level, UDFS gradually reduces the frequency level until users feel discomfort. The proposed technique calculates an optimum frequency as the starting frequency and then reduces that frequency until user shows discomfort. When CPU reaches in ideal state, processor frequency goes to the lowest level to save battery life. Our proposed technique is implemented in Samsung Galaxy S2 and it reduces 25% power consumption compared to default DVFS and 3% than existing UDFS technique.