Patent ID: 6697622
Filing Date: 2004-02-24
Classification: H04B,H04W,Y02D

Abstract:
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.