Patent ID: 8619660

Claim:
A mobile communication system in which a plurality of common channels are added by offering a new service, comprising: the plurality of said common channels configured to transmit same data; a monitor unit that uses reception path search results of any of dedicated channels and random access channels of mobile stations to monitor the communication state of the mobile stations in a cell: and a control unit that determines, based on monitored results realized by said monitor unit, a state in which a distribution of the mobile stations within the cell that receives said new service is unbalanced to implement control such that a communication range permitted by said plurality of common channels is divided and used, wherein: said monitor unit, in the common channels that are added by said new service, uses the state of effective paths of path search positions of the dedicated channels that are being used at a time of the addition to monitor a total number of the dedicated channels and reception positions in the cell; and said control unit, when it is determined based on the monitor results that the mobile stations that receive said new service that uses the added common channels are concentrated in the vicinity of a base station, prepares a new common channel from the plurality of the added common channels having different transmission frequency and effects switching such that the mobile stations present in the vicinity of the cell boundary communicate with the new common channel having the different transmission frequency; wherein said monitor unit and said control unit are coupled to a memory.