WIRELESS POSITION DETERMINATION USING ADJUSTED ROUND TRIP TIME MEASUREMENTS
First Claim
1. A method for wirelessly determining a position of a mobile station, comprising:
- measuring a round trip time (RTT) to each of a plurality of wireless access points;
estimating a first distance to each wireless access point based upon the round trip time delay and an initial processing time associated with each wireless access point;
estimating a second distance to each wireless access point based upon supplemental information;
combining the first and second distance estimates to each wireless access point; and
calculating the position of the mobile station based upon the combined distance estimates.
3 Assignments
0 Petitions
Accused Products
Abstract
One method for wirelessly determining a position of a mobile station includes measuring a round trip time (RTT) to a plurality of wireless access points, estimating a first distance to each wireless access point based upon the round trip time delay and an initial processing time associated with each wireless access point, estimating a second distance to each wireless access point based upon supplemental information, combining the first and second distance estimates to each wireless access point, and calculating the position based upon the combined distance estimates. Another method includes measuring a distance to each wireless access point based upon a wireless signal model, calculating a position of the mobile station based upon the measured distance, determining a computed distance to each wireless access point based upon the calculated position of the mobile station, updating the wireless signal model, and determining whether the wireless signal model has converged.
484 Citations
117 Claims
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1. A method for wirelessly determining a position of a mobile station, comprising:
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measuring a round trip time (RTT) to each of a plurality of wireless access points; estimating a first distance to each wireless access point based upon the round trip time delay and an initial processing time associated with each wireless access point; estimating a second distance to each wireless access point based upon supplemental information; combining the first and second distance estimates to each wireless access point; and calculating the position of the mobile station based upon the combined distance estimates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for wireless position determination, comprising:
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a wireless transceiver; a processor coupled to the wireless transceiver; and a memory coupled to the processor, wherein the memory stores executable instructions and data for causing the processor to measure a round trip time (RTT) to each of a plurality of wireless access points, estimate a first distance to each wireless access point based upon the round trip time delay and an initial processing time associated with each wireless access point, estimate a second distance to each wireless access point based upon supplemental information, combine the first and second distance estimates to each wireless access point, and calculate the position of the mobile station based upon the combined distance estimates. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An apparatus for wireless position determination, comprising:
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means for measuring a round trip time (RTT) to each of a plurality of wireless access points; means for estimating a first distance to each wireless access point based upon the round trip time delay and an initial processing time associated with each wireless access point; means for estimating a second distance to each wireless access point based upon supplemental information; means for combining the first and second distance estimates to each wireless access point; and means for calculating the position of the mobile station based upon the combined distance estimates. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A method for wirelessly determining a position of a mobile station using signals provided by a plurality of wireless access points, comprising:
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measuring a distance to each wireless access point based upon a wireless signal model; calculating a position of the mobile station based upon the measured distance; determining a computed distance to each wireless access point based upon the calculated position of the mobile station; updating the wireless signal model based upon the measured and computed distances to each wireless access point; and determining whether the wireless signal model has converged. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. An apparatus for wireless position determination of a mobile station using signals provided by a plurality of wireless access points, comprising:
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a wireless transceiver; a processor coupled to the wireless transceiver; and a memory coupled to the processor, wherein the memory stores executable instructions and data for causing the processor to measure a distance to each wireless access point based upon a wireless signal model, calculate a position of the mobile station based upon the measured distance, determine a computed distance to each wireless access point based upon the calculated position of the mobile station, update the wireless signal model based upon the measured and computed distances to each wireless access point, and determine whether the wireless signal model has converged. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78)
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79. An apparatus for wireless position determination of a mobile station using signals provided by a plurality of wireless access points, comprising:
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means for measuring a distance to each wireless access point based upon a wireless signal model; means for calculating a position of the mobile station based upon the measured distance; means for determining a computed distance to each wireless access point based upon the calculated position of the mobile station; means for updating the wireless signal model based upon the measured and computed distances to each wireless access point; and means for determining whether the wireless signal model has converged. - View Dependent Claims (80, 81, 82, 83, 84, 85, 86, 87, 88, 89)
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90. A method for wirelessly determining a position of a mobile station, comprising:
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measuring a round trip time delay to each of a plurality of wireless access points; estimating an initial processing time for each of the wireless access points; calculating the position of the mobile station based upon the measured round trip time delays and estimated processing times; and updating the estimated processing time for each of the wireless access points based upon the calculated position of the mobile station. - View Dependent Claims (91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103)
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104. An apparatus for wirelessly determining a position of a mobile station, comprising:
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a wireless transceiver; a processor coupled to the wireless transceiver; and a memory coupled to the processor, wherein the memory stores executable instructions and data for causing the processor to measure a round trip time delay to each of a plurality of wireless access points, estimate an initial processing time for each of the wireless access points, calculate the position of the mobile station based upon the measured round trip time delays and estimated processing times, and update the estimated processing time for each of the wireless access points based upon the calculated position of the mobile station. - View Dependent Claims (105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116)
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117. An apparatus for wirelessly determining a position of a mobile station, comprising:
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means for measuring a round trip time delay to each of a plurality of wireless access points; means for estimating an initial processing time for each of the wireless access points; means for calculating the position of the mobile station based upon the measured round trip time delays and estimated processing times; and means for updating the estimated processing time for each of the wireless access points based upon the calculated position of the mobile station.
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Specification