SYSTEM AND METHOD TO OBTAIN SIGNAL ACQUISITION ASSISTANCE DATA
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Abstract
Signal acquisition assistance data is obtained for receiving devices such as wireless position assisted location devices seeking signals from any source, such as satellite vehicles and base stations. The data may be obtained from previously acquired data, based upon evaluation of changes in parameters such as time and location that may jeopardize validity. In some cases the data may be adjusted for the changes in parameters. Refined data may be calculated by a receiver using partial measurements of signal sets, particularly if the acquisition assistance data provided by a remote entity includes more distinct parameters than have typically been provided. New data need not be obtained until the validity of previous data expires due to limitations upon temporal extrapolation using Doppler coefficients, unless mobile station movement that cannot be compensated is detected, and jeopardizes validity of the previous data.
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Citations
53 Claims
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1-26. -26. (canceled)
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27. A method of evaluating location-related information in a wireless telecommunications system, the method comprising:
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a) obtaining, at a telecommunications entity in the wireless telecommunications system, a first list of base stations relevant to the mobile station according to particular criteria at a first time; b) obtaining, at the telecommunications entity, a second list of base stations relevant to the mobile station according to the particular criteria at a second time, later than the first time; and c) making, at the telecommunications entity, a comparison of the second list of relevant base stations and the first list of base stations; and d) evaluating, at the telecommunications entity, a validity of previously obtained location-related information based in part on the comparison to determine a location-related action to take. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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36. An apparatus for evaluating location-related information in a wireless telecommunications system, the apparatus comprising:
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a) obtaining means for obtaining first and second lists of base stations relevant to the mobile station according to at least a first criterion at first and second times, respectively, with the second time being later than the first time; b) comparing means for making a comparison of the second list of base stations and the first list of base stations; and c) evaluating means for evaluating a validity of previously obtained location-related information based in part on the comparison to determine a location-related action to take. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44)
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45. A computer program product residing on a non-transitory processor-readable medium of a wireless telecommunications system for use in evaluating location-related information, the computer program product comprising processor-readable instructions configured to cause a processor to:
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a) obtain a first list of base stations relevant to the mobile station according to first criteria at a first time; b) obtain a second list of base stations relevant to the mobile station according to the first criteria at a second time, the second time being after the first time; and c) make a comparison of the first list of base stations and the second list of base stations; and d) evaluate a validity of previously obtained location-related information based in part on the comparison to determine a location-related action to take. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53)
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Specification