Bubble Sensing Essay

7462 WordsFeb 15, 201230 Pages
Bubble-Sensing: A New Paradigm for Binding a Sensing Task to the Physical World using Mobile Phones Hong Lu∗ Nicholas D. Lane∗ ∗ Dartmouth Shane B. Eisenman† Andrew T. Campbell∗ College Hanover, New Hampshire, USA {hong,niclane,campbell}@dartmouth.edu University New York, New York, USA shane@ee.columbia.edu † Columbia Abstract—We propose Bubble-Sensing, a new sensor network abstraction that allows mobile phones users to create a binding between tasks (e.g., take a photo, or sample audio every hour indefinitely) and the physical world at locations of interest, that remains active for a duration set by the user. We envision mobile phones being able to affix task bubbles at places of interest and then receive sensed data as it becomes available in a delay-tolerant fashion, in essence, creating a living documentary of places of interest in the physical world. The system relies on other mobile phones that opportunistically pass through bubble-sensing locations to acquire tasks and do the sensing on behalf of the initiator, and deliver the data to the bubblesensing server for retrieval by the user that initiated the task. We describe an implementation of the bubble-sensing system using sensor-enabled mobile phones, specifically, Nokia’s N80 and N95 (with GPS, accelerometers, microphone, camera). Task bubbles are maintained at locations through the interaction of “bubble carriers”, which carry the sensing task into the area of interest, and “bubble anchors”, which maintain the task bubble in the area when the bubble carrier is no longer present. In our implementation, bubble carriers and bubble anchors implement a number of simple mobile-phone based protocols that refresh the task bubble state as new mobile phones move through the area. Phones communicate using the local ad hoc 802.11g radio to transfer task state and maintain the task in the region of

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