System and method for optimizing location estimate of mobile unit
First Claim
1. A method of locating a mobile device comprising the steps of:
- (a) providing a plurality of grid points in a geographic region using a processor in a component of a communications network, each of said grid points including at least one characterizing parameter of calibration data;
(b) providing a plurality of network measurement reports for a mobile device in the geographic region;
(c) comparing data values associated with ones of said plurality of grid points to at least one parameter of ones of said plurality of network measurement reports;
(d) generating a first location estimate of the mobile device for each of said ones of said plurality of network measurement reports (“
NMR”
) based on the comparison performed in step (c);
(e) determining a second location estimate of the mobile device as a function of at least one of said generated first location estimates; and
(f) interpolating between ones of said plurality of grid points when more than one grid point corresponds to said at least one parameter of said plurality of network measurement reports,wherein said interpolating is a function of the following relationship;
C_Ratioi=[Ci−
Cmin]/[CN−
Cmin]for a set of N grid points, N>
1, where Ci is a metric associated with an ith grid point, CN is a metric associated with the worst grid point, and Cmin is a metric associated with the best corresponding grid point.
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Accused Products
Abstract
The location of a wireless mobile device may be estimated using, at least in part, one or more pre-existing Network Measurement Reports (“NMRs”) which include calibration data for a number of locations within a geographic region. The calibration data for these locations is gathered and analyzed so that particular grid points within the geographic region can be determined and associated with a particular set or sets of calibration data from, for example, one or more NMRs. Embodiments of the present subject matter also provide a method of improving a location estimate of a mobile device. Received signal level measurements reported by a mobile device for which a location estimate is to be determined may be evaluated and/or compared with the characteristics associated with the various grid points to estimate the location of the mobile device.
196 Citations
21 Claims
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1. A method of locating a mobile device comprising the steps of:
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(a) providing a plurality of grid points in a geographic region using a processor in a component of a communications network, each of said grid points including at least one characterizing parameter of calibration data; (b) providing a plurality of network measurement reports for a mobile device in the geographic region; (c) comparing data values associated with ones of said plurality of grid points to at least one parameter of ones of said plurality of network measurement reports; (d) generating a first location estimate of the mobile device for each of said ones of said plurality of network measurement reports (“
NMR”
) based on the comparison performed in step (c);(e) determining a second location estimate of the mobile device as a function of at least one of said generated first location estimates; and (f) interpolating between ones of said plurality of grid points when more than one grid point corresponds to said at least one parameter of said plurality of network measurement reports, wherein said interpolating is a function of the following relationship;
C_Ratioi=[Ci−
Cmin]/[CN−
Cmin]for a set of N grid points, N>
1, where Ci is a metric associated with an ith grid point, CN is a metric associated with the worst grid point, and Cmin is a metric associated with the best corresponding grid point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of locating a mobile device comprising the steps of:
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(a) providing a plurality of grid points in a geographic region using a processor in a component of a communications network, each of said grid points including at least one characterizing parameter of calibration data; (b) providing a plurality of network measurement reports for a mobile device in the geographic region; (c) comparing data values associated with ones of said plurality of grid points to at least one parameter of ones of said plurality of network measurement reports; (d) generating a first location estimate of the mobile device for each of said ones of said plurality of network measurement reports (“
NMR”
) based on the comparison performed in step (c);(e) determining a second location estimate of the mobile device as a function of at least one of said generated first location estimates; and (f) interpolating between ones of said plurality of grid points when more than one grid point corresponds to said at least one parameter of said plurality of network measurement reports, wherein said interpolating is a function of the following relationship;
C_Ratioi=[Ci−
Cmin]/[Cmin]for a set of N grid points, N>
1, where Ci is a metric associated with an ith grid point and Cmin is a metric associated with the best corresponding grid point.
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21. A method of locating a mobile device comprising the steps of:
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(a) providing a plurality of grid points in a geographic region using a processor in a component of a communications network, each of said grid points including at least one characterizing parameter of calibration data; (b) providing a plurality of network measurement reports for a mobile device in the geographic region; (c) comparing data values associated with ones of said plurality of grid points to at least one parameter of ones of said plurality of network measurement reports; (d) generating a first location estimate of the mobile device for each of said ones of said plurality of network measurement reports (“
NMR”
) based on the comparison performed in step (c);(e) determining a second location estimate of the mobile device as a function of at least one of said generated first location estimates; (f) interpolating between ones of said plurality of grid points when more than one grid point corresponds to said at least one parameter of said plurality of network measurement reports; and (g) assigning weights to the ith grid point as a function of the following relationship;
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Specification