Method and apparatus to select an optimum site and/or sector to provide geo-location data
First Claim
1. A method of geo-locating a mobile station in a geographic area serviced by a plurality of base station sites co-located with location measurement units (LMUs), the method comprising:
- receiving a location request;
determining a serving sector of a serving site;
determining a reference position within the geographical area of the serving sector;
selecting at least one secondary site to provide location information of the mobile station, the secondary site being selected based on its location with respect to the reference position;
obtaining the location information from at least one measurement unit located within the at least one secondary site; and
estimating the location of the mobile station based on the obtained location information,wherein the step of selecting at least one secondary site further comprises calculating a cost function to determine which secondary site has a minimum total cost and flagging that site as no longer considered an available candidate site.
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Accused Products
Abstract
A system and method selects secondary base stations to task that provide geo-location information used to geo-locate a mobile station. A network overlay location system may be co-located at base station sites of a wireless communications network. The location measurement units of the network overlay system provide location information of the mobile station, which may be determined via one or more geo-location techniques, for example: time of arrival (TOA), time difference of arrival (TDOA), uplink time difference of arrival (UTDOA), angle of arrival (AOA), signal power, radio fingerprinting etc. Selecting secondary base stations to task using various selection criteria may provide optimum results when geo-locating a mobile station.
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Citations
18 Claims
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1. A method of geo-locating a mobile station in a geographic area serviced by a plurality of base station sites co-located with location measurement units (LMUs), the method comprising:
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receiving a location request; determining a serving sector of a serving site; determining a reference position within the geographical area of the serving sector; selecting at least one secondary site to provide location information of the mobile station, the secondary site being selected based on its location with respect to the reference position; obtaining the location information from at least one measurement unit located within the at least one secondary site; and estimating the location of the mobile station based on the obtained location information, wherein the step of selecting at least one secondary site further comprises calculating a cost function to determine which secondary site has a minimum total cost and flagging that site as no longer considered an available candidate site.
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2. A method of geo-locating a mobile station in a geographic area serviced by a plurality of base station sites co-located with location measurement units (LMUs), the method comprising:
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selecting a reference position within a communication coverage area of a of a first site; selecting at least one secondary site according to a function of the reference position; selecting at least one secondary sector of the at least one selected secondary site to task based on a function of the reference position; and tasking the at least one secondary sector to obtain location information of the mobile station, wherein the step of selecting at least one secondary site further comprises administering a proximity test to flag the site that is closest to the reference position so that site will not be considered an available candidate site. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of geo-locating a mobile station in a geographic area serviced by a plurality of base station sites co-located with location measurement units (LMUs), the method comprising:
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selecting a reference position within a communication coverage area of a first site; selecting at least one secondary site according to a function of the reference position; selecting at least one sector of the at least one selected secondary site to task based on the reference position; and tasking the at least one sector to obtain location information of the mobile station, wherein the step of selecting at least one secondary site further comprises calculating a cost function to determine which secondary site has a minimum total cost and flagging that site as no longer considered an available candidate site.
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13. A mobile station geo-location system having a plurality of base station sites co-located with location measurement units (LMUs), the system comprising:
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a first site designated as a serving site in communication with the mobile station; at least one secondary site selected to provide location information of the mobile station, the at least one secondary site selected from a group of at least two secondary sites, and where the at least one selected secondary site produces at least one preferred parameter that the least one non-selected secondary site cannot produce, wherein the non-selected secondary site was not selected using a proximity test which flag the non-selected site as being closest to the mobile station. - View Dependent Claims (14, 15, 16)
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17. A method of geo-locating a MS in a geographic area serviced by a plurality of BS sites co-located with location measurement units (LMUs), and at least one geo-location control system (GCS) with a record of the mobile station'"'"'s current serving BS site and respective current serving sector, the improvement comprising determining a reference position location of the mobile station within the current serving sector and based on the reference position, tasking a secondary base station site and/or sector of the secondary base station to provide location information of the mobile station, wherein the tasked secondary base station site was selected as a function of a cost function to determine which secondary site has a minimum total cost and flagging that site as no longer considered an available candidate site.
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18. A method of geo-locating a mobile station in a geographic area serviced by a plurality of base station sites co-located with location measurement units (LMUs), the method comprising:
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determining the locations of secondary base station sites with respect to a serving base station site location; selecting a mobile station reference position based on the type of location arrangement of the secondary sites; selecting at least one secondary site according to a function of the reference position by administering a proximity test to flag the site that is closest to the reference position so that site will not be considered an available candidate site; selecting at least one secondary sector of the at least one selected secondary site to task based on a function of the reference position; and tasking the at least one secondary sector to obtain location information of the mobile station.
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Specification