Methods and systems for determining location using a cellular and WLAN positioning system by selecting the best WLAN PS solution
First Claim
1. A method of increasing the accuracy of a resulting location estimate for a WLAN and cellular enabled device using cellular positioning information, the method comprising:
- identifying at least one wireless local area network (WLAN) access point (WLAN AP) in signal range of a WLAN and cellular enabled device based on wireless signals received by the WLAN and cellular enabled device transmitted by the at least one WLAN AP;
retrieving an estimated location of the at least one WLAN AP stored in a reference database;
determining a cellular-based location estimate for the WLAN and cellular enabled device based at least in part on cellular measurements received from at least one cell tower by the WLAN and cellular enabled device;
comparing the cellular-based location estimate to the estimated location of the at least one WLAN AP retrieved from the reference database to determine whether a distance between the estimated location of the at least one WLAN AP and an estimated location of the at least one cell tower exceeds a pre-determined threshold;
upon the condition that the distance between the estimated location of the at least one WLAN AP retrieved from the reference database and the estimated location of the at least one cell tower exceeds the pre-determined threshold, inferring that the estimated location of the at least one WLAN AP is inaccurate; and
rejecting the at least one WLAN AP that is inferred to have an inaccurate estimated location when determining the resulting location estimate for the WLAN and cellular enabled device based at least on the cellular-based location estimate.
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Abstract
The disclosed subject matter relates to a method and system for increasing the accuracy of a WLAN based position estimate using cellular positioning information. In some embodiments, the method can include determining a set of possible WLAN location solutions for a WLAN and cellular enabled device based on one or more WLAN access points, obtaining cellular measurements from at least one cell tower, and determining the best WLAN location solution from the set of possible WLAN location solutions using the cellular measurements. In one embodiment, the method can include using the cellular measurements from the at least one cell tower to provide a cellular based location estimate for the WLAN and cellular enabled device.
349 Citations
20 Claims
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1. A method of increasing the accuracy of a resulting location estimate for a WLAN and cellular enabled device using cellular positioning information, the method comprising:
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identifying at least one wireless local area network (WLAN) access point (WLAN AP) in signal range of a WLAN and cellular enabled device based on wireless signals received by the WLAN and cellular enabled device transmitted by the at least one WLAN AP; retrieving an estimated location of the at least one WLAN AP stored in a reference database; determining a cellular-based location estimate for the WLAN and cellular enabled device based at least in part on cellular measurements received from at least one cell tower by the WLAN and cellular enabled device; comparing the cellular-based location estimate to the estimated location of the at least one WLAN AP retrieved from the reference database to determine whether a distance between the estimated location of the at least one WLAN AP and an estimated location of the at least one cell tower exceeds a pre-determined threshold; upon the condition that the distance between the estimated location of the at least one WLAN AP retrieved from the reference database and the estimated location of the at least one cell tower exceeds the pre-determined threshold, inferring that the estimated location of the at least one WLAN AP is inaccurate; and rejecting the at least one WLAN AP that is inferred to have an inaccurate estimated location when determining the resulting location estimate for the WLAN and cellular enabled device based at least on the cellular-based location estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for increasing the accuracy of a location estimate for a WLAN and cellular enabled device using cellular positioning information, the system comprising:
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a positioning module comprising; a wireless local area network (WLAN) module for receiving wireless signals transmitted by at least one WLAN access point (WLAN AP); a cellular positioning module for receiving cellular measurements from at least one cell tower; and logic located in the positioning module configured to identify at least one WLAN AP in signal range of a WLAN and cellular enabled device based at least in part on the wireless signals; retrieve an estimated location of the at least one WLAN AP stored in a reference database; determine a cellular-based location estimate for the WLAN and cellular enabled device based at least in part on the cellular measurements; compare the cellular-based location estimate to the estimated location of the at least one WLAN AP retrieved from the reference database to determine whether a distance between the estimated location of the at least one WLAN AP and an estimated location of the at least one cell tower exceeds a pre-determined threshold; upon the condition that the distance between the estimated location of the at least one WLAN AP retrieved from the reference database and the estimated location of the at least one cell tower exceeds the pre-determined threshold, infer that the estimated location of the at least one WLAN AP is inaccurate; and reject the at least one WLAN AP that is inferred to have an inaccurate estimated location when determining the resulting location estimate for the WLAN and cellular enabled device based at least on the cellular-based location estimate. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification