METHOD AND SYSTEM FOR SELECTING OPTIMAL SATELLITES FOR A-GPS LOCATION OF HANDSETS IN WIRELESS NETWORKS
First Claim
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1. A method for determining a set of satellites for which assistance data may be provided to a wireless device, comprising the steps of:
- (a) determining a boundary for an approximate area in which the wireless device is located;
(b) determining one or more sets of satellites as a function of said boundary; and
(c) determining an optimum set of satellites from said one or more sets of satellites as a function of the visibility of each of said one or more sets of satellites at predetermined points substantially on said boundary.
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Abstract
A system and method for determining a set of satellites for which assistance data may be provided to a wireless device. A boundary for an approximate area in which the wireless device is located may be determined and one or more sets of satellites may be determined as a function of the boundary. An optimum set of satellites from the one or more sets of satellites may then be determined using a satellite selection function on the one or more sets of satellites at predetermined points substantially on the boundary.
17 Citations
19 Claims
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1. A method for determining a set of satellites for which assistance data may be provided to 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 one or more sets of satellites as a function of said boundary; and (c) determining an optimum set of satellites from said one or more sets of satellites as a function of the visibility of each of said one or more sets of satellites at predetermined points substantially on said boundary. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 one or more sets of satellites as a function of said boundary; (c) determining an optimum set of satellites from said one or more sets of satellites as a function of the visibility of each of said one or more sets of satellites at predetermined points substantially on said boundary; (d) transmitting assistance data to said device, said assistance data including information from said optimum set of satellites; and (e) determining the location of the wireless device from said information. - View Dependent Claims (11, 12, 13)
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14. A system for determining a set of satellites for which assistance data may be provided to a wireless device comprising:
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(a) circuitry for determining a boundary for an approximate area in which a wireless device is located; (b) circuitry for determining one or more sets of satellites as a function of said boundary; and (c) circuitry for determining an optimum set of satellites from said one or more sets of satellites as a function of a satellite selection function at predetermined points substantially on said boundary. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification