Method and apparatus for locating a mobile receiver having a position cache
First Claim
1. A method for locating a position of an A-GPS receiver comprising:
- receiving a cell identification code; and
retrieving, from a position cache, a position estimate for said A-GPS receiver that corresponds to said cell identification code, where said A-GPS receiver and said position cache are within a mobile device.
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Accused Products
Abstract
A method and apparatus that uses a position cache for locating a position of an A-GPS receiver that is embedded in a mobile device. In one embodiment of the invention, the position cache is a look up table comprising cell identification codes and position information. The position information is generally the location of the center of each cell that is identified by a cell identification code in the table. This position information is used as a position estimate for the A-GPS receiver. The method receives a cell identification code from a wireless network, retrieves a position estimate from the a position cache that corresponds to the received cell identification code, then computes a current position of the A-GPS receiver using position location aiding information, certain satellite data and the position estimate of the A-GPS receiver.
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Citations
24 Claims
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1. A method for locating a position of an A-GPS receiver comprising:
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receiving a cell identification code; and
retrieving, from a position cache, a position estimate for said A-GPS receiver that corresponds to said cell identification code, where said A-GPS receiver and said position cache are within a mobile device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A mobile device comprising:
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an A-GPS receiver; and
a position cache for storing a position estimate for the mobile device and a related cell identification code for a cell of a wireless network. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A system for locating positions of mobile devices comprising:
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at least one mobile device comprising an A-GPS receiver, a position cache and a wireless transceiver, where the position cache stores a position estimate for the mobile device and a related cell identification code for each cell of a wireless network that may be or was used by the at least one mobile device; and
a server in wireless communication with the mobile device. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification