Dynamic adjustment of search window size in response to signal strength
First Claim
1. A method for determining a size of a search window, the method comprising:
- measuring a strength of a PN encoded signal transmitted by a preferred base station;
selecting the size of the search window based on said strength of said PN encoded signal; and
searching for a PN encoded signal transmitted by a neighboring base station by using the search window.
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Accused Products
Abstract
A method and apparatus of adjusting a search window size by a remote unit in a slotted mode wireless communication system. In a slotted mode communication system, the remote unit is in an “active state” during its assigned slot. While in the active state the controller in a remote unit passes selected sets of search parameters to a search engine. The search engine performs searches on base stations using the selected sets of search parameters. One search parameter, the search window size, is adjusted in response to a measured signal strength of a first base station signal. The adjusted search window size is used by the remote unit when searching other base stations.
71 Citations
18 Claims
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1. A method for determining a size of a search window, the method comprising:
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measuring a strength of a PN encoded signal transmitted by a preferred base station;
selecting the size of the search window based on said strength of said PN encoded signal; and
searching for a PN encoded signal transmitted by a neighboring base station by using the search window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
determining a delay between the transmission of a signal from the preferred base station and the reception of said signal by a remote unit.
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7. The method of claim 6 further comprising:
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decreasing the size of said search window if said delay decreases; and
increasing the size of said search window if said delay increases.
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8. The method of claim 1, wherein the PN encoded signal is a pilot signal.
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9. The method of claim 1, wherein the size of the search window is based on a PN offset used for the search window.
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10. A remote unit
means for measuring a strength of a PN encoded signal transmitted by a preferred base station; -
means for selecting a size of a search window in response to said strength of said PN encoded signal; and
means for searching for a PN encoded signal transmitted by a neighboring base station by using the search window. - View Dependent Claims (11, 12, 13, 14)
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15. A remote unit for use in a wireless communication system comprising:
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a search engine configured to determine a signal strength of a signal received from a preferred base station and perform searches for a signal transmitted by a neighboring base station; and
a controller in communication with said search engine configured to pass selected search parameters to the search engine, receive search result, evaluate said determined signal strength of said received signal, and determine a size of a search window to be used to search for the signal transmitted by the neighboring base station. - View Dependent Claims (16, 17, 18)
a default size of the search window is communicated to said remote unit by the preferred base station; and
said controller uses said default size of the search window for some searches for signals transmitted by a base station.
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Specification