| 摘要 |
A wireless communication base station apparatus capable of suppressing the waste of a signaling source in retransmittal signaling of group scheduling. In this apparatus, a multiplexing part (101) multiplexes ACK or NACK signals to be transmitted to a plurality of terminals belonging to a plurality of groups for initial transmittals, thereby generating ACK/NACK multiplexed signals. A multiplexing part (102) multiplexes the group ID of one retransmittal group associated with the plurality of groups for initial transmittals with control information directed to retransmittal terminals that are some of the plurality of initial transmittal terminals and with the ACK/NACK multiplexed signals generated by the multiplexing part (101), thereby generating a control information multiplexed signal. A mapping part (107) maps the control information multiplexed signal generated by the multiplexing part (102) into PDCCH. A radio transmitting part (110) transmits, via a transmission antenna (111), the control information multiplexed signal mapped in the PDCCH.
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