NEIGHBORING BASE STATION INFORMATION UPDATE METHOD, INFORMATION MANAGEMENT METHOD FOR CELL SEARCH IN MOBILE COMMUNICATIONS SYSTEM, CELL SEARCH METHOD OF MOBILE STATION, MOBILE COMMUNICATIONS SYSTEM, MOBILE STATION, BASE STATION AND CONTROL STATION (PLEASE SEE FILE FOR FULL TITLES)

摘要

ABSTACT A neighboring base station information updatemethod etc. is provided that appropriately updates andsets information about neighboring base stations,which is sent from a base station to a mobile station. The mobile station captures from a received perch channel, base station information about the base station that transmits the perch channel, andtransmits the base station information to a basestation. The base station receives the base station information, and updates the. neighboring base station information in accordance With the base station information. For example, the perch channel is spreadinto a wideband using a spreading code with a ratehigher than an information rate, and in addition, is doubly spread using a first spreading code set that has a cycle period equal to an information symbol period and is common to a11 the base stations, and asecond spreading code that has a cycle period longerthan the information symbol period and differs from base station to base station. The base station information consists of a second spreading code number used by the base station and phase information aboutthe second spreading code. According to the presentinvention, the inter-base station asynchronous systemcan implement fast cell search comparable to that ofthe inter-base station synchronous system in thestandby mode and soft handover mode.