Transmitter identifier database for enhanced GPS performance
First Claim
1. A method for determining a position of a mobile station, the method comprising:
- storing a database of transmitter identifiers and associated mobile station position information, wherein the mobile station position information is one or more previously determined positions of the mobile station;
searching for a signal in an uncertainty region that is a function of the mobile station position information in the database; and
determining the position of the mobile station using the signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A mobile station database of cellular identifications and associated position information is stored in mobile station memory. The mobile station uses the position information in the database to assist in determining a current position for the mobile based on an identifier, such as cell ID, base station BSIC, PSC, or carrier frequency. A satellite vehicle signal is searched in an uncertainty region that is a function of position information associated with the current identifier. The uncertainty region can be limited by assumed platform dynamics via predefined velocity and acceleration information. Time maintenance for the mobile station can also be achieved through known approximate position from the position database and measurement of a single satellite vehicle propagation delay. The mobile station can compare a position determination obtained through satellite vehicle signals with position database information to determine the validity of that position. Out-of-network position information is also stored in the position database and is optionally shared with a network.
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Citations
35 Claims
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1. A method for determining a position of a mobile station, the method comprising:
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storing a database of transmitter identifiers and associated mobile station position information, wherein the mobile station position information is one or more previously determined positions of the mobile station; searching for a signal in an uncertainty region that is a function of the mobile station position information in the database; and determining the position of the mobile station using the signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of determining mobile station position, comprising:
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receiving a transmitter identifier from a base station; searching a position database stored in the mobile station for the transmitter identifier, wherein the position database includes at least one identifier and mobile station position information associated with the transmitter identifier, wherein the mobile station position information is one or more previously determined positions of the mobile station; searching for a signal based upon the mobile station position information from the position database; and determining precise mobile station position based upon an acquired signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A mobile station apparatus comprising:
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a two-way communication system; a position location system; mobile station control; and memory comprising a position database comprising at least one transmitter identifier and mobile station position information associated with the transmitter identifier, wherein the mobile station position information is one or more previously determined positions of the mobile station; wherein the two-way communication system, position location system, mobile control, and memory communicate such that a signal is searched based upon the mobile station position information in the position database. - View Dependent Claims (29, 30, 31, 32, 33)
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34. A mobile station apparatus comprising:
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means for storing a database of transmitter identifications and associated mobile station position information in mobile station memory, wherein the mobile station position information is one or more previously determined positions of the mobile station; means for receiving a transmitter identifier from a base station; means for searching the database to locate mobile station position information associated with the received transmitter identifier; means for searching for a signal in an uncertainty region that is a function of the located mobile station position information; and means for determining the position of the mobile station assisting based upon signal acquisition.
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35. A processor comprising:
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a position location system and a mobile control; memory comprising a position database comprising at least one transmitter identifier and mobile station position information associated with the transmitter identifier, wherein the mobile station position information is one or more previously determined positions of a mobile station; wherein the memory communicates with the position location system and the mobile control such that the position location system searches for a signal based upon the mobile station position information in the position database.
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Specification