×

MOBILE DEVICE LOCATION SYSTEM FOR WIRELESS E911 SERVICES

  • US 20100048163A1
  • Filed: 08/20/2008
  • Published: 02/25/2010
  • Est. Priority Date: 08/20/2008
  • Status: Abandoned Application
First Claim
Patent Images

1. A method for locating a mobile telecommunication device within a building or underground facility, the method comprising:

  • receiving over a telecommunication network an emergency transmission from a mobile telecommunication device located within the facility;

    determining propagation time delay of the received emergency transmission;

    based on the determined propagation time delay, identifying two or more RF nodes located within the facility in the proximity of the mobile device;

    sending a request to the identified RF nodes to perform signal strength measurements on the mobile telecommunication device; and

    comparing the signal strength measurements of the RF nodes to estimate the approximate location coordinates of the mobile telecommunication device relative to the RF nodes within the facility.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×