H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
H04Q 7/22 (2006.01) G01S 5/00 (2006.01) G01S 5/14 (2006.01) H04Q 7/38 (2006.01)
Patent
CA 2220365
Apparatus for locating a mobile phone in a cellular phone system, in which the cellular phone system comprises plural base stations, each base station being associated with a cell, and in which the mobile phone is equipped with means for communicating signal strength of received signals to the base stations, has a processing unit operably connected to the plural base stations by first communications links, the processing unit having as input signal strength measurements of signals received by the mobile phone and having as output position location signals representing the position of the mobile phone in the cell, wherein, in operation, the processing unit operates upon the signal strength measurements to calculate a path loss exponent associated with the position of the mobile phone in the cell and solve for the position of the mobile phone using the path loss exponent. A user interface is operably connected to the processing unit by a second communication link for communicating the position of the mobile phone in the cell. Various algorithms may be used to solve the channel model equation. A method of locating a mobile phone by A) communicating signal strength measurements of signals received by the mobile phone to a processing unit; B) operating upon the signal strength measurements with the processing unit to calculate a path loss exponent associated with the position of the mobile phone in the cell; C) calculating the position of the mobile phone by using the path loss exponent as a factor in a channel model equation and solving the equation; and D) communicating the position of the mobile phone in the cell with a user interface.
Fattouche Michel
Messier Geoffrey G.
Petersen Brent R.
Telecommunications Research Laboratories
Thompson Lambert Llp
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