Studies on design and development of energy-aware middleware for mobile terminals

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In streaming playback of video, portable wireless devices consume a lot of electric power for video data decoding and wireless communication. Therefore there are demands to control the power consumption so that the battery life can be extended to a desirable playback duration and/or the specified percentage of the battery capacity is left for the other applications. In this research, we have proposed a battery-aware video streaming system to play back for specified duration considering a preference of quality of video specified by each user and the remaining battery amount for portable wireless devices. In the system, power consumption is reduced by using transcoding of video and periodic bulk transfer of video data. We have implemented the system and carried out several experiments using a PDA and a laptop PC. As a result, we have confirmed that our system can extend the battery life up to 2.8 times on the PDA and up to 1.6 times on the laptop PC, and can control the battery life with reasonably small error.