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
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1. A method of deriving a seed position of a subscriber station in a wireless communication system, comprising:
- receiving an overhead message from the wireless communication system; and
deriving the seed position of the subscriber station from a parameter in the overhead message.
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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.
116 Citations
34 Claims
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1. A method of deriving a seed position of a subscriber station in a wireless communication system, comprising:
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receiving an overhead message from the wireless communication system; and
deriving the seed position of the subscriber station from a parameter in the overhead message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In a subscriber station having a position in a wireless communications system, a method of updating one or more data structures associating possible values of one or more overhead message parameters with corresponding positions, comprising:
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obtaining values of one or more parameters from one or more overhead messages received by the subscriber station from a wireless communications system;
mapping the one or more parameter values to a corresponding position by accessing the one or more data structures;
setting a seed position of the subscriber station to the corresponding position;
deriving a fix of the position of the subscriber station from one or more satellite transmissions originating from a GPS-type position determination system, including searching for one or more of such transmissions responsive to the seed position;
determining whether an update condition is present responsive to the fix of the subscriber station'"'"'s position; and
updating the one or more data structures if an update condition is present. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. In a subscriber station having a position in a wireless communications system, method of updating one or more data structures having a plurality of entries associating possible values of one or more parameters, obtainable from one or more overhead messages communicated by a wireless communications system, with corresponding positions, comprising:
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obtaining values of one or more parameters from one or more overhead messages received by the subscriber station from a wireless communications system;
accessing the one or more data structures to determine if one or more entries are present associating the one or more parameter values with a corresponding position;
setting a seed position of the subscriber station to the corresponding position if said one or more entries associating the one or more parameter values to that position are present in the one or more data structures; and
updating the one or more data structures if said one or more entries are not present in the one or more data structures. - View Dependent Claims (20, 21)
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22. In a subscriber station in a wireless communication system, a method of updating a data structure having a plurality of entries associating possible values of at least one parameter obtainable from at least one overhead message communicated by a wireless communications system, with corresponding positions, comprising:
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receiving an overhead message from a wireless communications system indicating that an update condition is present; and
updating the data structure responsive to information from a central server accessible by the subscriber station. - View Dependent Claims (23, 24, 25, 26)
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27. In a subscriber station having a position in a wireless communications system, comprising:
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a memory storing a data structure associating possible parameter values obtainable by the subscriber station from at least one overhead messages communicated by the wireless communications system, with corresponding positions; and
at least one processor configured to (1) obtain parameter values from the at least one overhead message;
(2) access the data structure to map the parameter values to a corresponding position; and
(3) derive a seed position of the subscriber station responsive to the access. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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Specification