Supporting Energy-Efficient Uploading Strategies for Continuous Sensing Applications on Mobile Phones Eighth International Conference on Pervasive Computing, 17-20 Maggio 2010, Helsinki, Finland, Lecture Notes in Computer, 6030 LNCS, pp. 355-372.

none5Continuous sensing applications (e.g., mobile social networking applications) are appearing on new sensor-enabled mobile phones such as the Apple iPhone and recent Nokia phones. These applications present significant challenges to the phone operation given their limited computational and energy resources and the need for the applications to share real-time continuous sensed data with back-end servers. System designers have to deal with a trade-off between data accuracy (i.e., application fidelity) and energy constraints in the design of uploading strategies between phones and back-end servers. In this paper, we present the design, implementation and evaluation of several techniques to optimize the information uploading process for continuous sensing on mobile phones. We analyze the cases of continuous and intermittent connectivity imposed by low-duty cycle design considerations or poor wireless network coverage in order to drive down energy consumption and extend the lifetime of the phone. We also show how location prediction can be integrated into this forecasting framework. We present the implementation and the experimental evaluation of these uploading techniques based on measurements from the deployment of a continuous sensing application on 20 Nokia N95 phones used by 20 people for a period of 2 weeks. Our results show that we can make significant energy savings while limiting the impact on the fidelity, making continuous sensing a viable application for mobile phones. For instance, we show that it is possible to achieve an accuracy equal to 80% while saving 60% of traffic sent.noneM. Musolesi; M. Piraccini; K. Fodor; A. Corradi; A. T. CampbellM. Musolesi; M. Piraccini; K. Fodor; A. Corradi; A. T. Campbel