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GPS Auto-Sleep for Energy-Efficient Location Tracking

GPS Auto-Sleep for Energy-Efficient Location Tracking. Sean Barbeau, Phil Winters, Nevine Georggi Center for Urban Transportation Research Rafael Perez, Miguel Labrador Department of Computer Science & Engineering. Portions of work funded by the Florida Department of Transportation and

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GPS Auto-Sleep for Energy-Efficient Location Tracking

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  1. GPS Auto-Sleep for Energy-Efficient Location Tracking Sean Barbeau, Phil Winters, Nevine Georggi Center for Urban Transportation Research Rafael Perez, Miguel Labrador Department of Computer Science & Engineering Portions of work funded by the Florida Department of Transportation and the National Center for Transit Research Protected under US Patent # 8,036,679

  2. Problem • Past vehicle-based GPS tracking give low-resolution view of daily travel behavior • Are these GPS fixes: • Points-of-interest? • Stops in traffic? • Difficult to extract info: • Distance traveled • Origin-Destination pairs • Misses non-vehicle trips Protected under US Patent # 8,036,679

  3. Innovation • Our research team created TRAC-IT, a GPS-enabled mobile phone app • TRAC-IT can capture “high-definition” view of travel behavior • Much easier to determine: • Path, distance traveled • Origin-Destination pairs • Avg. speeds • Can capture transit/bike/walk trips Protected under US Patent # 8,036,679

  4. New Problem • We can record GPS fixes as frequently as once per second and send to our server • However, frequent GPS fixes come at great cost to: • battery energy • data transfer over network • Both battery life and cell network data transfer are very limited resources Protected under US Patent # 8,036,679

  5. One-day Requirement Sprint CDMA EV-DO Rev. A network Sprint CDMA EV-DO Rev. A network Protected under US Patent # 8,036,679

  6. New Idea • What if we could dynamically change the GPS sampling interval on the phone? • Use four second sampling interval when moving • Use five minute interval when stopped • Challenges: • Can we create mobile apps that do this? • Would this be enough to make a difference in battery life? • How do we handle GPS noise when trying to detect movement? Protected under US Patent # 8,036,679

  7. GPS Data Noise Causes Uncertainty in Movement HTC Hero Sprint EV-DO Rev A network 29.7 meters Protected under US Patent # 8,036,679

  8. Detecting User Movement 4 second GPS sampling 5 minute GPS sampling • GPS noise causes uncertainty in states • Many false transitions waste battery energy Protected under US Patent # 8,036,679

  9. Detecting User Movement 4 second GPS sampling 5 minute GPS sampling • What if we represent this binary, or two-state, problem more like a continuum? Protected under US Patent # 8,036,679

  10. Gradually change GPS interval from “awake” to “asleep” based on certainty in user’s movement With some data (e.g., very high speeds) snap back to “awake” New invention – GPS Auto-Sleep “AWAKE” “ASLEEP” Protected under US Patent # 8,036,679 10

  11. Sanyo Pro 200 Sprint CDMA EV-DO Rev. A network Protected under US Patent # 8,036,679

  12. “Asleep” Sanyo Pro 200 Sprint CDMA EV-DO Rev. A network “Awake” Protected under US Patent # 8,036,679

  13. Evaluation – Summary of 30 tests n = 30 Protected under US Patent # 8,036,679

  14. Evaluation – Daily Tracking Impact of GPS Auto-Sleep on Battery Life Sanyo Pro 200 Sprint CDMA EV-DO Rev. A network Protected under US Patent # 8,036,679

  15. Potential Data Savings – GPS Auto-Sleep • Assuming each GPS fix is transmitted to server, GPS Auto-Sleep saves ~1.3MB in data transfer PER PHONE in 13 hours • *Sleep time of 120 seconds between GPS fixes while user is not moving, • and 4 seconds between GPS fixes while user is moving Protected under US Patent # 8,036,679

  16. Patent issued on Oct. 11, 2011 US Patent # 8,036,679 Optimizing Performance of Location-Aware Applications using State Machines Protected under US Patent # 8,036,679

  17. Utility & Commercialization • We have been tracking high-def travel behavior of over 30 participants over 9 months • Using TRAC-IT mobile app w/ GPS Auto-Sleep • USDOT-funded Value Pricing project • DAJUTA, a Florida-based company, has non-exclusively licensed the technology from USF • Other companies are also expressing interest • GPS Auto-Sleep is one module in “Location-Aware Information Systems Client (LAISYC)” framework • 15 patents pending on other modules Protected under US Patent # 8,036,679

  18. Thank you Questions? Sean Barbeau, M.S. Research Associate barbeau@cutr.usf.edu (813) 974-7208 locationaware.usf.edu Protected under US Patent # 8,036,679

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