System and Method to Obtain Signal Acquisition Assistance Data
First Claim
1. A method of acquiring a signal at a telecommunications system receiver with the aid of acquisition assistance data, comprising:
- a) obtaining acquisition assistance data at the receiver, including data provided by an entity remote from the receiver;
b) determining, subsequently to a time of obtaining the acquisition assistance data, a need for the receiver to acquire a particular signal;
c) evaluating a validity of the previously obtained acquisition assistance data for use in acquiring the particular signal; and
d) calculating an expected time of arrival parameter of the particular signal based in part on an estimate of receiver clock bias.
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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.
62 Citations
38 Claims
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1. A method of acquiring a signal at a telecommunications system receiver with the aid of acquisition assistance data, comprising:
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a) obtaining acquisition assistance data at the receiver, including data provided by an entity remote from the receiver;
b) determining, subsequently to a time of obtaining the acquisition assistance data, a need for the receiver to acquire a particular signal;
c) evaluating a validity of the previously obtained acquisition assistance data for use in acquiring the particular signal; and
d) calculating an expected time of arrival parameter of the particular signal based in part on an estimate of receiver clock bias. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of acquiring a signal at a telecommunications system receiver with the aid of acquisition assistance data, comprising:
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a) determining a need to acquire a plurality of signals at a receiver;
b) acquiring a first of the plurality of signals at the receiver; and
c) employing measured parameters of the first of the plurality of signals to calculate acquisition assistance data for a second of the plurality of signals. - View Dependent Claims (16, 17, 18, 19, 21, 22, 23)
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20. The method of 15 further comprising determining that some previously received acquisition assistance data is invalid due to movement of the receiver subsequent to receiving the acquisition assistance data.
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24. A method of acquiring a signal at a mobile station telecommunications system receiver with the aid of acquisition assistance data, comprising:
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a) obtaining first acquisition assistance data at the mobile station while the mobile station is at a first location; and
b) compensating the first acquisition assistance data at the mobile station for a new location of the mobile station to aid a search for a signal by the mobile station at a different second location. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method of determining changes to a location of a mobile station in a cellular telecommunications system, comprising:
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a) obtaining a list of base stations relevant to the mobile station according to particular criteria at a first time;
b) obtaining a list of base stations relevant to the mobile station according to the particular criteria at a later second time; and
c) comparing the later list of relevant base stations to the previous list of base station neighbors. - View Dependent Claims (35, 36, 37, 38)
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Specification