CELL ID BASED POSITIONING FROM CELL INTERSECTIONS
First Claim
1. A method for locating a wireless device, comprising the steps of:
- obtaining measured signal strengths of one or more identifiable signals from the wireless device;
determining location of the wireless device by comparing the measured signal strengths to reference signal strengths of the one or more identifiable signals.
2 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods are described for determining location of wireless devices using signal strength of signals detected by the wireless devices. The strength of signals received from identifiable sources is typically compared to reference signal strength measurements collected or estimated at known locations. Information identifying the source of the signals is typically obtained from data provided in the signals. Mappers associate combinations of reference signal strengths with geometrically shaped geographical regions such that signal strength measurements can be used as indices to locate a region in which a wireless device can be found. Systems and methods are described for receiving signal strength information from known locations where the information can be used to update and improve mapping system databases.
209 Citations
30 Claims
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1. A method for locating a wireless device, comprising the steps of:
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obtaining measured signal strengths of one or more identifiable signals from the wireless device; determining location of the wireless device by comparing the measured signal strengths to reference signal strengths of the one or more identifiable signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for mapping signal strength comprising:
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identifying portions of a geographic area wherein each portion is associated with a signal and strengths of the signal measured within the each portion are expected to fall within a predetermined range; delineating intersections corresponding to selected overlapping portions; and fitting the intersections to regions having a desired geometrical shape. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A system comprising:
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a database configured to maintain expected signal strengths of signals within a geographic area; a mapper for identifying regions of the geographic area wherein each region is characterized by a range of expected signal strengths for each of one or more of the signals detectable in the each region; and one or more servers for locating a wireless device in one of the identified regions based on signal strengths measured by the wireless device. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification