Methods and systems for deriving seed position of a subscriber station in support of unassisted GPS-type position determination in a wireless communication system
First Claim
1. A method of determining a position using a data structure in memory of a subscriber station in a wireless communication system, the data structure having a plurality of entries, each entry comprising a stored position associated with a value of a parameter obtainable from overhead messages, the method comprising:
- operating in an unassisted position location mode;
obtaining a particular value of the parameter from an overhead message;
determining that an entry exists in the data structure based on the obtained particular value;
accessing the entry to obtain a seed position corresponding to a position estimate of the subscriber station associated with a position uncertainty smaller than another position uncertainty associated with another position estimate of the subscriber station stored in another entry of the data structure; and
determining, using the seed position, a position from signals from a satellite position system.
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Accused Products
Abstract
In a method and system for deriving a seed position of a subscriber station in a wireless communications system in supporting unassisted GPS-type position determination is provided, the subscriber station receives overhead messages from the wireless communications system, and derives the seed position from the parameter values. The subscriber station may use a data structure in its memory and map possible parameter values to corresponding positions that may serve as the seed positions.
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Citations
21 Claims
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1. A method of determining a position using a data structure in memory of a subscriber station in a wireless communication system, the data structure having a plurality of entries, each entry comprising a stored position associated with a value of a parameter obtainable from overhead messages, the method comprising:
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operating in an unassisted position location mode; obtaining a particular value of the parameter from an overhead message; determining that an entry exists in the data structure based on the obtained particular value; accessing the entry to obtain a seed position corresponding to a position estimate of the subscriber station associated with a position uncertainty smaller than another position uncertainty associated with another position estimate of the subscriber station stored in another entry of the data structure; and determining, using the seed position, a position from signals from a satellite position system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18)
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17. The method of 1, wherein the wireless communication system comprises a UMTS wireless communication system.
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19. A subscriber station for determining a position using a data structure in memory, the data structure having a plurality of entries, each entry comprising a stored position associated with a value of a parameter obtainable from overhead messages, the subscriber station comprising:
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a processor; and memory, coupled to the processor, comprising code to cause the processor to operate in an unassisted position location mode; code to cause the processor to obtain a particular value of the parameter from an overhead message; code to cause the processor to determine an entry exists in the data structure based on the obtained particular value; code to cause the processor to access the entry to obtain a seed position corresponding to a position estimate of the subscriber station associated with a position uncertainty smaller than another position uncertainty associated with another position estimate of the subscriber station stored in another entry of the data structure; and code to cause the processor to determine, using the seed position, a position from signals from a satellite position system.
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20. A computer-readable product comprising a computer-readable medium comprising:
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code for causing at least one computer to operate in an unassisted position location mode; code for causing at least one computer to obtain a value of a parameter from an overhead message; code for causing at least one computer to determine that an entry exists in the data structure based on the obtained value; code for causing at least one computer to access the entry to obtain a seed position corresponding to a position estimate of the subscriber station associated with a position uncertainty smaller than another position uncertainty associated with another position estimate of the subscriber station stored in another entry of the data structure; and code for causing at least one computer to determine, using the seed position, a position from signals from a satellite position system.
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21. A subscriber station for determining a position using a data structure in memory, the data structure having a plurality of entries, each entry comprising a stored position associated with a value of a parameter obtainable from overhead messages, the subscriber station comprising:
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a position engine configured to; operate the subscriber station in an unassisted position location mode; obtain a particular value of the parameter from an overhead message; determine that an entry exists in the data structure based on the obtained particular value; access the entry to obtain a seed position corresponding to a position estimate of the subscriber station associated with a position uncertainty smaller than another position uncertainty associated with another position estimate of the subscriber station stored in another entry of the data structure; and a searching engine configured to determine, using the seed position, a position from signals from a satellite position system.
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Specification