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Location Service for Mobile Device. New Ideas Increasing proliferation of 802.11 base stations and PC card  use 802.11 wireless LAN infrastructure to determine mobile device location inside building

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Location service for mobile device
Location Service for Mobile Device

  • New Ideas

    • Increasing proliferation of 802.11 base stations and PC card  use 802.11 wireless LAN infrastructure to determine mobile device location inside building

    • Signal strength can be measured and there is a correlation between signal strength and distance

    • Signal strengths from multiple base stations can triangulate the exact location

  • Key Design/Approach

    • Data collation: mapping the service area in advance for an accurate signal map

    • Algorithm 1: best matching: O(n2)

    • Algorithm 2: multidimensional search O(log(n))

    • GUI (see above)

    • Limitation : Placement of Base stations limited to certain locations

  • Results/Lesson Learned

    • Implemented in Linux

    • Tested in ACES 6th floor

      • Beacon stations: 2

      • Service granularity: 10 feet

    • Accuracy: 90% of the time: within 15 feet

    • Lesson learned:

      • 802.11 Linux driver does not support “promiscuous” mode to pick up beacons from multiple base stations

      • Resolved to ad-hoc mode

Project team: Ravishankar Chamarajnagar, Jeff Napper

URL: http://www.cs.utexas.edu/users/ravshank/mobile_project/project.html


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