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Home Ring Tones Method-of-and-apparatus-for-pilot-channel-acquisition

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 Method of and apparatus for pilot channel acquisition

Details
Inventors: Storm, Brian D.; Krause, David J.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Pham; Chi H.
Assistant Examiner: Duong; Frank
Attorney, Agent or Firm: Williams; Lalita P., Kordich; Donald C.

A wireless communication device 100 acquires a pilot channel before an assigned slot when the wireless communication device is operating in the slotted mode of a CDMA system. The wireless communication device comprises a searcher receiver 107 that determines the short-term average pilot strength of active and neighbor pilot channels. Finger receivers 107 determine the long-term average pilot strength of the active and neighbor pilot channels. A logic and control circuit 113 assigns the finger receivers to the pilot channels according to their short-term average pilot strength, determines if the long-term average pilot strength of a neighbor channel is greater than the active pilot channel's pilot strength, and determines to hand off to the neighbor pilot channel with the greater long-term average pilot strength. Moreover, an early detection correlation length can be dynamically adjusted according to the pilot strength of the active pilot channel to shorten the pilot acquisition process.

DETAILED DESCRIPTION What is claimed is: 1.
A method of acquiring a pilot channel in a Code-Division Multiple Access system, the method comprising the steps of: setting an early detection threshold (EDT) parameter to a first value; determining a pilot strength of an active pilot channel; determining whether the active pilot channel's pilot strength is less than the first value; re-setting the EDT parameter to a second value when the active pilot channel's pilot strength is not less than the first threshold value; determining whether there is at least one neighbor pilot channel in a neighbor set; and sweeping the at least one neighbor pilot channel when there is at least one neighbor pilot channel, the step of sweeping the at least one neighbor pilot channel including the substeps of, performing a correlation at a particular chip offset of the at least one neighbor pilot channel, determining a pilot strength at an early detection correlation length at the particular chip offset, determining whether the pilot strength at the early detection correlation length is less than the EDT parameter, and terminating the correlation at the particular chip offset when the pilot strength at the early detection correlation length is less than the EDT parameter; assigning a finger receiver to the at least one neighbor pilot channel; re-determining the pilot strength of the active pilot channel; re-determining the pilot strength of the at least one neighbor pilot channel that has a finger receiver assigned; and handing off to the at least one neighbor pilot channel that has a finger receiver assigned when the re-determined pilot strength of the at least one neighbor pilot channel that has a finger receiver assigned is greater than the re-determined pilot strength of the active pilot channel.
2.
The method of claim 1 wherein the second value is greater than the first value.
3.
The method of claim 1 wherein the step of determining a pilot strength of an active pilot channel includes the substep of determining the active pilot's short-term average E



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