Positioning with wireless local area networks and WLAN-aided global positioning systems
First Claim
Patent Images
1. A method comprising:
- determining a location of a wireless device in a communications system based on location information received from one or more access points, wherein the location information includes a position associated with at least one of the one or more access points, a current time and GPS almanac data; and
acquiring a satellite positioning system signal at the wireless device based at least in part on the determined location.
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Abstract
Accurate position capability can be quickly provided using a Wireless Local Area Network (WLAN). When associated with a WLAN, a wireless device can quickly determine its relative and/or coordinate position based on information provided by an access point in the WLAN. Before a wireless device disassociates with the access point, the WLAN can periodically provide time, location, and decoded GPS data to the wireless device. In this manner, the wireless device can significantly reduce the time to acquire the necessary GPS satellite data (i.e. on the order of seconds instead of minutes) to determine its coordinate position.
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Citations
20 Claims
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1. A method comprising:
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determining a location of a wireless device in a communications system based on location information received from one or more access points, wherein the location information includes a position associated with at least one of the one or more access points, a current time and GPS almanac data; and acquiring a satellite positioning system signal at the wireless device based at least in part on the determined location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11)
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10. A method comprising:
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determining a location of a wireless device in a communications system based on location information received from one or more access points, wherein the location information includes a position associated with at least one of the one or more access points; identifying a first satellite having a highest elevation angle with respect to the wireless device based on the received location information; acquiring the satellite positioning system signal from the first satellite at the wireless device based at least in part on the determined location; and determining a frequency offset associated with the satellite positioning signal acquired from the first satellite by; approximating a Doppler effect of the first satellite to be zero; and specifying the frequency offset as a difference between an oscillator frequency of the first satellite and a receiver frequency of the wireless device.
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12. A wireless device comprising:
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means for determining a location of a wireless device in a communications system based on location information received from one or more access points, wherein the location information includes a position associated with at least one of the one or more access points; means for acquiring a satellite positioning system signal at the wireless device based at least in part on the determined location; and means for using the acquired satellite positioning system signal to generate a modified location of the wireless device. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A wireless device comprising:
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means for determining a location of a wireless device in a communications system based on location information received from one or more access points, wherein the location information includes a position associated with at least one of the one or more access points; means for acquiring a satellite positioning system signal at the wireless device based at least in part on the determined location; means for identifying a first satellite having a highest elevation angle with respect to the wireless device based on the received location information; and means for determining a frequency offset associated with the satellite positioning signal acquired from the first satellite by;
approximating a Doppler effect of the first satellite to be zero, and specifying the frequency offset as a difference between an oscillator frequency of the first satellite and a receiver frequency of the wireless device.
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Specification