MOBILE COMMUNICATION SYSTEM, ITS SCRAMBLE CODE ASSIGNING METHOD, MOBILE STATION, AND BASE STATION

摘要

In a mobile communication system where a base station autonomously assigns a scramble code, it is possible to reduce the calculation amount of the mobile station and the report information between the base station and the mobile station. In the mobile communication system, the base station starts communication by using an initialization scramble code used only upon start of a predetermined base station. The mobile station positioned in a cell judges whether the scramble code identified upon cell search is the initialization scramble code. Only if the scramble code is the initialization scramble code, a candidate scramble code is decided and it is judged whether the candidate scramble code can be used in communication. Control information including the judgment result is reported to the base station. According to the control information, the base station decides the service scramble code to be used, from the candidate scramble codes, and modifies the code to the service scramble code to start the communication.