Fast acquisition of a pilot signal in a wireless communication device
First Claim
1. A wireless communication system comprising:
- at least one remote unit configured to perform a coarse search of an entire PN space using coarse search parameters and identify a plurality of portions of the entire PN space, and subsequently to perform a fine search of the plurality of portions of the entire PN space using fine search parameters.
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Abstract
In a remote unit of a wireless communication system, the speed of acquisition, or reacquisition, of a pilot signal by a search engine is increased. PN space is divided into segments and a coarse search of each segment is performed using a set of “fast” search parameters. A set of peak signal strengths, along with their corresponding PN offsets, is saved for each segment of PN space. Following the search of all segments of PN space, the peak signal strengths which were saved during the coarse acquisition are evaluated. Coarse acquisition search results are used by the remote unit to determine fine search window parameters for subsequent searches performed by the remote unit search engine. The fine search parameters concentrate searching efforts on portions of PN space most likely to contain a viable base station pilot signal.
49 Citations
26 Claims
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1. A wireless communication system comprising:
at least one remote unit configured to perform a coarse search of an entire PN space using coarse search parameters and identify a plurality of portions of the entire PN space, and subsequently to perform a fine search of the plurality of portions of the entire PN space using fine search parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A remote unit in a wireless communication system comprising:
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a search engine configured to receive coarse search parameters, to perform a coarse search of an entire PN space using the coarse search parameters, and to output search results of the coarse search, and subsequently to receive fine search parameters including a plurality of portions of the entire PN space to conduct a fine search, and to perform a fine search of the plurality of portions of the entire PN space using the fine search parameters; a memory configured to receive and store the search results of the search engine; and a controller configured to receive the coarse search results from the memory, to determine the plurality of portions of the entire PN space based on the coarse search results, and to transmit the fine and coarse search parameters to the search engine. - View Dependent Claims (9, 10, 11)
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12. A method of initially acquiring a base station by a wireless remote unit, the method comprising:
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performing a coarse search of an entire PN space for a pilot signal using coarse search parameters; determining a plurality of portions of the entire PN space to conduct a fine search based on the coarse search; and subsequently performing a fine search of the plurality of portions of the entire PN space using fine search parameters. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A remote unit in a wireless communication system configured to perform a search for a pilot signal, the remote unit comprising:
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means for performing a coarse search of an entire PN space for a pilot signal using coarse search parameters; means for determining a plurality of portions of the entire PN space to conduct a fine search based on the coarse search; and means for subsequently performing a fine search of the plurality of portions of the entire PN space using fine search parameters. - View Dependent Claims (21, 22, 23, 24)
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25. A computer readable storage medium encoded thereon with instructions that when executed cause an apparatus to perform a method of initially acquiring a base station by a wireless remote unit, said method comprising:
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performing a coarse search of an entire PN space for a pilot signal using coarse search parameters; determining a plurality of portions of the entire PN space to conduct a fine search based on the coarse search; and subsequently performing a fine search of the plurality of portions of the entire PN space using fine search parameters. - View Dependent Claims (26)
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Specification