Method and system for providing assistance data for A-GPS location of handsets in wireless networks
First Claim
1. A method for determining the location of a wireless device, comprising the steps of:
- (a) determining a boundary for an approximate area in which the wireless device is located;
(b) determining a plurality of satellites as a function of said boundary;
(c) if the number of said plurality of satellites is greater than a predetermined threshold then reducing the number of satellites as a function of one or more of the elevation of each satellite above the horizon, a distance between each satellite to one or more other satellites, and an altitude of each satellite;
(d) transmitting assistance data to said device, said assistance data including information from said plurality of satellites; and
(e) determining the location of the wireless device from said information.
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Accused Products
Abstract
A system and method for determining the location of a wireless device. A boundary for an approximate area in which the wireless device is located is determined and a plurality of satellites may be determined as a function of the boundary. Assistance data is transmitted to the device which includes information from the plurality of satellites, and the location of the wireless device may be determined from the information. In one embodiment, if the number of the plurality of satellites is greater than a predetermined threshold then the number of satellites may be reduced as a function of one or more of the elevation of each satellite above the horizon, a distance between each satellite to one or more other satellites, and an altitude of each satellite.
21 Citations
25 Claims
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1. A method for determining the location of a wireless device, comprising the steps of:
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(a) determining a boundary for an approximate area in which the wireless device is located; (b) determining a plurality of satellites as a function of said boundary; (c) if the number of said plurality of satellites is greater than a predetermined threshold then reducing the number of satellites as a function of one or more of the elevation of each satellite above the horizon, a distance between each satellite to one or more other satellites, and an altitude of each satellite; (d) transmitting assistance data to said device, said assistance data including information from said plurality of satellites; and (e) determining the location of the wireless device from said information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for estimating the location of a device, comprising the steps of:
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(a) determining a boundary for a region in which the device is located; (b) determining one or more available satellites; (c) if the number of said one or more available satellites is greater than a predetermined threshold then reducing the number of satellites as a function of one or more of the elevation of each satellite above the horizon, a distance between each satellite to one or more other satellites, and an altitude of each satellite; (d) receiving assistance data from a communications network, said assistance data including information from said one or more available satellites; (e) receiving a plurality of signals comprising one signal from each of the one or more available satellites; and (f) estimating a location of the device as a function of said plurality of signals. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for determining the location of a device from signals received from a plurality of Global Navigation Satellite System (“
- GNSS”
) satellites comprising;(a) circuitry for determining a boundary for an approximate area in which a wireless device is located; (b) circuitry for determining a first plurality of satellites as a function of said boundary; (c) circuitry for determining a second plurality of satellites if the number of first plurality of satellites is greater than a predetermined threshold, said second plurality of satellites being a function of one or more of the elevation of each satellite above the horizon, a distance between each satellite to one or more other satellites, and an altitude of each satellite; (d) a transmitter for transmitting assistance data to said wireless device, said assistance data including information from said first plurality of satellites; and (e) circuitry for determining the location of the wireless device from said information. - View Dependent Claims (22, 23, 24, 25)
- GNSS”
Specification