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Finding 9-1-1 Callers in Tall Buildings

Finding 9-1-1 Callers in Tall Buildings. Wonsang Song, Jae Woo Lee, Byung Suk Lee, and Henning Schulzrinne Columbia University. Problem. Location is key in emergency calls To route calls to proper call center To pinpoint the caller on site But indoor location is still a challenge

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Finding 9-1-1 Callers in Tall Buildings

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  1. Finding 9-1-1 Callers in Tall Buildings Wonsang Song, Jae Woo Lee, Byung Suk Lee, and Henning Schulzrinne Columbia University

  2. Problem • Location is key in emergency calls • To route calls to proper call center • To pinpoint the caller on site • But indoor location is still a challenge • GPS does not work indoors • Vertical accuracy is very important indoors • Barometers are not accurate in emergency situations because of PPV or HVAC

  3. Our approach • Use smartphone’s inertial sensors to trace people’s vertical movement • Dead reckoning: calculate traveled distance or number of floors from sensor measurements • Augment sensor-based approach with minimum and practical infrastructure support • Bluetooth beacons at building’s entrance provide initial location and other building information

  4. Evaluation Errors when traveling 9 floors making 1-4 stops using elevator Errors when traveling 1-9 floors without stopping using elevator Landing counting errors in 50 trials of walking 4 floors on stairway CDF of errors when traveling 2 floors (7.3m) using escalator

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