Patent ID: 7539173

Claim:
A radio communication system, comprising: a radio terminal; a first base station configured to communicate with the radio terminal; a second base station which is a handover destination of the radio terminal; and a control equipment connected to the first base station and the second base station, wherein the control equipment includes a transmission time slot determining unit configured to determine a plurality of control signal time slots and an uplink communication signal time slot, from among a plurality of time slots included in a frame, the first base station includes a first control signal transmitter configured to transmit control signals by using the control signal time slots determined by the transmission time slot determining unit, the second base station includes a second control signal transmitter configured to transmit control signals by using the same control signal time slots used by the first base station, and the radio terminal includes: a reception time slot determining unit configured to determine a reception time slot for receiving one of the control signals transmitted from the first base station, and determine a reception time slot for receiving one of the control signals transmitted from the second base station respectively, from among the control signal time slots determined by the transmission time slot determining unit, a control signal receiver configured to receive the control signals transmitted from the first base station and the second base station respectively, based on a result of a determination by the reception time slot determining unit, and a communication signal transmitter configured to transmit a communication signal including data to the first base station in the uplink communication signal time slot determined by the transmission time slot determining unit, wherein the reception time slot determining unit determines a time slot which has a smallest time difference from the uplink communication signal time slot as the reception time slot for receiving one of the control signals transmitted from the first base station from among the control signal time slots which are earlier than the uplink communication signal time slot, if at least one of the control signal time slots are earlier than the uplink communication signal time slot, and determines a time slot which has a largest time difference from the uplink communication signal time slot as the reception time slot for receiving one of the control signals transmitted from the first base station from among the control signal time slots, if all the control signal time slots are later than the uplink communication signal time slot, when reception time slot determining unit determines the reception time slot for receiving one of the control signals transmitted from the first base station.