A user equipment, base station, and method for conducting device-to-device communications. A wireless communication system includes the user equipment and another user equipment. The user equipment includes: a control unit; and a transmission unit controlled by the control unit and used for transmitting control information to another user equipment by an uplink channel, wherein the control information includes at least one of data transmission format information and power control information. With the user equipment, base station, and method, the efficiency of communication between devices conducting device-to-device communications can be increased, thereby improving data transmission performance.