86. DYNAMIC BASE STATION RECONFIGURATION FOR BATTERY EFFICIENT VIDEO DOWNLOAD

Department: Electrical & Computer Engineering
Faculty Advisor(s): Sujit Dey

Primary Student
Name: Ranjini B Guruprasad
Email: rgurupra@ucsd.edu
Phone: 858-534-7883
Grad Year: 2013

Abstract
With the advent of smart phones and tablets, the usage of mobile devices is definitely shifting from voice calls and messaging to more data intensive applications, including web browsing, music and video, creating more demand on the battery of mobile devices. It is projected that mobile video will account for about two-thirds of the huge growth in mobile data traffic by 2015, indicating that video download and playback will dominate battery consumption on mobile devices. In this paper, we develop techniques for battery efficient video delivery to mobile devices. Our approach utilizes the elasticity of the client video buffer to dynamically adapt the video transmission rate while ensuring no stalling, thereby enabling the base-station to adapt the MIMO-OFDM transceiver configurations so as to reduce the battery current required by the MIMO-OFDM components on the mobile device. Our approach also makes the base station stop video transmission for certain time periods opportunistically, letting the battery on the mobile device idle and benefit from charge recovery. Our proposed algorithms vary video transmission rate dynamically, depending on the battery level of the mobile device, the channel conditions experienced, and the video application QoS requirements. Experiments conducted under various network conditions and video QoS requirements, for various video download profiles, show more than 50% improvement in battery life time in comparison to conventional video download techniques not aware of battery life.

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