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Control method of searching neighboring cells, mobile station, and mobile communication system

  • US 6,697,622 B1
  • Filed: 09/05/2000
  • Issued: 02/24/2004
  • Est. Priority Date: 09/06/1999
  • Status: Expired due to Term
First Claim
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1. A control method of searching for a neighboring cell of a mobile station communicating with base stations in a direct sequence CDMA mobile communication system which transmits information by carrying out double modulation using a first spreading code group and one of second spreading codes, the first spreading code group including spreading codes that have a same repetition period as an information symbol period and are used in common by the base stations, the second spreading codes having a repetition period longer than the information symbol period, and being different for each of the base stations, said control method of searching for a neighboring cell comprising:

  • a step of storing into a first table the second spreading code and its phase of at least one perch channel, which second spreading code and phase are known;

    a step of storing a second spreading code used by a neighboring base station into a second table;

    a first search step of searching for a perch channel whose second spreading code and phase are unknown; and

    a second search step of searching for a perch channel whose second spreading code and phase are known, wherein said control method of searching for a neighboring cell carries out the first search step and the second search step using the first table and the second table.

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