Computationally-Efficient Estimation of the Location of a Wireless Terminal Based on Pattern Matching
First Claim
1. A method comprising:
- receiving a measurement of a first characteristic of a first signal that is processed by a wireless terminal;
designating at least one of a plurality of possible locations of said wireless terminal as improbable; and
estimating the location of said wireless terminal based on a comparison of said measurement of said first characteristic of said first signal to a predicted value of said first characteristic of said first signal for at least one of said plurality of possible locations not designated as improbable.
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Abstract
A method of using a non-GPS-derived technique to estimate the location of an Assisted-GPS-enabled wireless terminal for the purposes of generating location-specific assistance data for the wireless terminal is disclosed. The wireless terminal then uses the assistance data to acquire and process one or more GPS signals and to derive information that is probative of the wireless terminal'"'"'s location. The GPS-derived location information is then combined with non-GPS-derived location to form an estimate of the location of the wireless terminal that is better than can be derived from either alone. This combination of GPS-derived and non-GPS techniques is particularly useful when the wireless terminal can only acquire one or two GPS signals because it is not possible to determine the location of the wireless terminal with only two GPS signals alone.
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Citations
28 Claims
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1. A method comprising:
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receiving a measurement of a first characteristic of a first signal that is processed by a wireless terminal; designating at least one of a plurality of possible locations of said wireless terminal as improbable; and estimating the location of said wireless terminal based on a comparison of said measurement of said first characteristic of said first signal to a predicted value of said first characteristic of said first signal for at least one of said plurality of possible locations not designated as improbable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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receiving a measurement of a first characteristic of a first signal that is processed by said wireless terminal; designating a possible location as improbable when said location is not provided wireless telecommunications service by a first base station that is known to be providing service to said wireless terminal; and estimating the location of said wireless terminal based on a comparison of said measurement of said first characteristic of said first signal to a predicted value of said first characteristic of said first signal for at least one of said plurality of possible locations not designated as improbable. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method comprising:
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receiving a measurement of a first characteristic of a first signal that is processed by said wireless terminal; designating a possible location as improbable when said location is not within the neighboring coverage area of a first base station that is known to be a neighboring base station of said wireless terminal; and estimating the location of said wireless terminal based on a comparison of said measurement of said first characteristic of said first signal to a predicted value of said first characteristic of said first signal for at least one of said plurality of possible locations not designated as improbable. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method comprising:
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receiving a measurement of a first characteristic of a first signal that is processed by a wireless terminal; designating a possible location of said wireless terminal as improbable when a difference of said measurement of said first characteristic of said first signal and a predicted value of said first characteristic of said first signal exceeds a threshold; and estimating the location of said wireless terminal based on a comparison of said measurement of said first characteristic of said first signal to a predicted value of said first characteristic of said first signal for at least one of said plurality of possible locations not designated as improbable. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification