Patent ID: 8917697

Claim:
A radio communication control method comprising: under carrier aggregation where first and second base frequency blocks are used to transmit transmission data in one transmission time unit, when cross-carrier scheduling is applied, assigning a first downlink control signal associated with transmission data to be transmitted with the first base frequency block, and a second downlink control signal associated with transmission data to be transmitted with the second base frequency block, to the second base frequency block; including assignment information indicative of a start position in the one transmission time unit signal of the transmission data to be transmitted with the first base frequency block, in the first downlink control signal, by using a number of symbols assigned to the first downlink control signal; and transmitting the first downlink control signal including the assignment information with the second base frequency block, wherein when the cross-carrier scheduling is not applied, assigning the first downlink control signal and the second downlink control signal to the first base frequency block and the second base frequency block, respectively, so as to transmit the first downlink control signal with the first base frequency block and the second downlink control signal with the second base frequency block, and whether or not to include the assignment information in the first downlink control signal is switched based on assignment status of the first and second frequency blocks for the transmission data and the first and second downlink control signals.