System and method to obtain signal acquisition assistance data
First Claim
1. A method of acquiring a signal at a telecommunications system receiver, the method comprising:
- obtaining acquisition assistance data;
acquiring a first signal at the receiver using the obtained acquisition assistance data;
using a location of the receiver obtained using the first signal to make a validity determination of whether the obtained acquisition assistance data are valid;
calculating, based on the obtained acquisition assistance data and the location of the receiver, and in response to the validity determination indicating that the obtained acquisition assistance data are not valid, updated acquisition assistance data to acquire a second signal; and
setting a code phase window size responsive to the updated acquisition assistance data.
1 Assignment
0 Petitions
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.
38 Citations
27 Claims
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1. A method of acquiring a signal at a telecommunications system receiver, the method comprising:
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obtaining acquisition assistance data; acquiring a first signal at the receiver using the obtained acquisition assistance data; using a location of the receiver obtained using the first signal to make a validity determination of whether the obtained acquisition assistance data are valid; calculating, based on the obtained acquisition assistance data and the location of the receiver, and in response to the validity determination indicating that the obtained acquisition assistance data are not valid, updated acquisition assistance data to acquire a second signal; and setting a code phase window size responsive to the updated acquisition assistance data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A telecommunications system receiver comprising:
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obtaining means for obtaining acquisition assistance data; acquiring means for acquiring a first signal at the receiver using the obtained acquisition assistance data; means for using a location of the receiver obtained using the first signal to make a validity determination of whether the obtained acquisition assistance data are valid; calculating means for calculating, based on the obtained acquisition assistance data and the location of the receiver, and in response to the validity determination indicating that the obtained acquisition assistance data are not valid, updated acquisition assistance data to acquire a second signal; and means for setting a code phase window size responsive to the updated acquisition assistance data. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A computer program product, for acquiring signals at a telecommunications system receiver, residing on a non-transitory processor-readable medium comprising instructions configured to cause a processor to:
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obtain acquisition assistance data; acquire a first signal at the receiver using the obtained acquisition assistance data; make a validity determination, using a location of the receiver obtained using the first signal, of whether the obtained acquisition assistance data are valid; calculate, based on the obtained acquisition assistance data and the location of the receiver, and in response to the validity determination indicating that the obtained acquisition assistance data are not valid, updated acquisition assistance data to acquire a second signal; and set a code phase window size responsive to the updated acquisition assistance data. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A wireless communication apparatus comprising:
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a memory to store computer instructions; and a processor-based device configured to cause, when executing the computer instructions stored in the memory, operations comprising; obtaining acquisition assistance data; acquiring a first signal using the obtained acquisition assistance data; using a location of the apparatus obtained using the first signal to make a validity determination of whether the obtained acquisition assistance data are valid; calculating, based on the obtained acquisition assistance data and the location of the apparatus, and responsive to the validity determination indicating that the obtained acquisition assistance data are not valid, updated acquisition assistance data to acquire a second signal; and setting a code phase window size responsive to the updated acquisition assistance data. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification