SYSTEM AND METHOD TO OBTAIN SIGNAL ACQUISITION ASSISTANCE DATA
First Claim
1. A method of acquiring a signal at a mobile station telecommunications system receiver with the aid of acquisition assistance data, the method comprising:
- a) obtaining first acquisition assistance data at the mobile station from a base station of a wireless communication system while the mobile station is at a first location;
b) making a determination that the mobile station has moved in excess of a threshold distance from the first location to a second location; and
c) compensating, in response to the determination, the first acquisition assistance data for the second location to provide second acquisition assistance data to aid a search for a signal by the mobile station at the second location.
1 Assignment
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Accused Products
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
29 Claims
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1. A method of acquiring a signal at a mobile station telecommunications system receiver with the aid of acquisition assistance data, the method comprising:
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a) obtaining first acquisition assistance data at the mobile station from a base station of a wireless communication system while the mobile station is at a first location; b) making a determination that the mobile station has moved in excess of a threshold distance from the first location to a second location; and c) compensating, in response to the determination, the first acquisition assistance data for the second location to provide second acquisition assistance data to aid a search for a signal by the mobile station at the second location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A mobile station configured to operate in a wireless telecommunications system, the mobile station comprising:
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a) obtaining means for obtaining first acquisition assistance data from a base station of the wireless telecommunications system, the first acquisition data being associated with a first location; b) determination means for making a determination that the mobile station has moved in excess of a threshold distance in response to the mobile station moving from the first location to a second location; and c) compensating means for compensating, in response to the determination, the first acquisition assistance data for the second location to provide second acquisition assistance data to aid a search for a signal by the mobile station at the second location. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A computer program product, for acquiring a signal at a mobile station telecommunications system receiver with the aid of acquisition assistance data, residing on a non-transitory processor-readable medium comprising instructions configured to cause a processor to:
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a) make a determination that the mobile station has moved in excess of a threshold distance from a first location to a second location, where first acquisition assistance data are obtained at the mobile station from a base station of a wireless communication system while the mobile station is at the first location; and b) compensate, in response to the determination, the first acquisition assistance data for the second location to provide second acquisition assistance data to aid a search for a signal by the mobile station at the second location. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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Specification