Methods and systems for deriving seed position of a subscriber station in support of unassisted GPS-type position determination in a wireless communication system
AssigneeQUALCOMM Incorporated
InventorsDouglas Neal Rowitch, Chang S. Row, Ann Yun-En Tien, Sanjeev Khushu
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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.
Claims21
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.
The method of 1, wherein the wireless communication system comprises a UMTS wireless communication system.
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:
- 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.
A computer-readable product comprising a computer-readable medium comprising:
- 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.
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:
- 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.
Dependencies are inferred from the claim text.