A base station, comprising: a load management unit configured to acquire data indicating communication traffic and a number of mobile stations in a coverage area of the base station; a power control unit configured to execute transmission power control of radio signal transmission; a state change control unit configured to control a change of operation state of the base station, between an active state in which the base station can form a radio link for communication with a mobile station and a radio transmission suspension state in which the base station suspends radio signal transmission, and wherein the state change control unit is configured to change the operation state of the base station from the active state to the radio transmission suspension state when the load management unit has judged that there is no mobile station that is to be connected to the base station, wherein said load management unit is configured to acquire, from a Radio Network Controller, RNC,, a received power status of a pilot signal of said base station measured by a mobile station which exists in a coverage area of an adjacent base station, after having judged that there is no mobile station that is to be connected to the base station; and wherein said state change control unit is configured to change the operation state of the base station from the active state to the radio transmission suspension state, in cases where said load management unit has acquired power status measured by the mobile station which exists in said coverage area of said adjacent base station, and changing to the transmission suspension status is done when the power status measured by the mobile station is lower than a threshold value for a given time. a load management unit configured to acquire data indicating communication traffic and a number of mobile stations in a coverage area of the base station; a power control unit configured to execute transmission power control of radio signal transmission; a state change control unit configured to control a change of operation state of the base station, between an active state in which the base station can form a radio link for communication with a mobile station and a radio transmission suspension state in which the base station suspends radio signal transmission, and wherein the state change control unit is configured to change the operation state of the base station from the active state to the radio transmission suspension state when the load management unit has judged that there is no mobile station that is to be connected to the base station, wherein said load management unit is configured to acquire, from a Radio Network Controller, RNC,, a received power status of a pilot signal of said base station measured by a mobile station which exists in a coverage area of an adjacent base station, after having judged that there is no mobile station that is to be connected to the base station; and wherein said state change control unit is configured to change the operation state of the base station from the active state to the radio transmission suspension state, in cases where said load management unit has acquired power status measured by the mobile station which exists in said coverage area of said adjacent base station, and changing to the transmission suspension status is done when the power status measured by the mobile station is lower than a threshold value for a given time.