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, the method comprising:
- obtaining acquisition assistance data from an entity remote from the receiver;
determining to acquire a plurality of signals at the receiver;
acquiring a first of the plurality of signals at the receiver;
employing measured parameters of the first of the plurality of signals to make a validity determination of the obtained acquisition assistance data;
calculating, based on the obtained acquisition assistance data and the validity determination, updated acquisition assistance data for a second of the plurality of signals; 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.
-
Citations
24 Claims
-
1. A method of acquiring a signal at a telecommunications system receiver with the aid of acquisition assistance data, the method comprising:
-
obtaining acquisition assistance data from an entity remote from the receiver; determining to acquire a plurality of signals at the receiver; acquiring a first of the plurality of signals at the receiver; employing measured parameters of the first of the plurality of signals to make a validity determination of the obtained acquisition assistance data; calculating, based on the obtained acquisition assistance data and the validity determination, updated acquisition assistance data for a second of the plurality of signals; and setting a code phase window size responsive to the updated acquisition assistance data. - View Dependent Claims (2, 3, 4, 5, 6, 8)
-
-
7. The method of 1 further comprising determining that some previously received acquisition assistance data are invalid due to movement of the receiver subsequent to receiving the previously received acquisition assistance data.
-
9. A telecommunications system receiver comprising:
-
obtaining means for obtaining acquisition assistance data from an entity remote from the receiver; acquiring means for acquiring a first of a plurality of signals at the receiver; first employing means for employing measured parameters of the first of the plurality of signals to make a validity determination of the obtained acquisition assistance data; means for calculating, based on the obtained acquisition assistance data and the validity determination, updated acquisition assistance data for a second of the plurality of signals; and means for setting a code phase window size responsive to the updated acquisition assistance data. - View Dependent Claims (10, 11, 12, 13, 14, 16)
-
-
15. The receiver of 9 further comprising means for determining that some previously received acquisition assistance data are invalid due to movement of the receiver subsequent to receiving the previously received acquisition assistance data.
-
17. A computer program product, for acquiring a signal at a telecommunications system receiver with the aid of acquisition assistance data, residing on a non-transitory processor-readable medium comprising instructions configured to cause the processor to:
-
determine to acquire a plurality of signals at the receiver; acquire a first of the plurality of signals at the receiver; employ measured parameters of the first of the plurality of signals to make a validity determination of acquisition assistance data from an entity remote from the receiver; calculate, based on the acquisition assistance data and the validity determination, updated acquisition assistance data for a second of the plurality of signals; and set a code phase window size responsive to the updated acquisition assistance data. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
-
Specification