USER TERMINAL, RADIO BASE STATION APPARATUS, RADIO COMMUNICATION SYSTEM AND RADIO COMMUNICATION METHOD

摘要

Provided are a user terminal accommodating the increase in the number of users, a wireless base station device, a wireless communication system, and a wireless communication method. A user terminal is provided with: a reception unit for receiving a downlink control signal that is multiplexed to a wireless resource from the beginning of a subframe to a predetermined OFDM symbol and a downlink control signal that is frequency-division multiplexed to a downlink data signal of a wireless resource after the predetermined OFDM symbol; a retransmission verification unit for performing a retransmission verification on the downlink data signal on the basis of the downlink control signal that was frequency-division multiplexed and for outputting a retransmission response signal; and a selection unit for selecting the wireless resource of an uplink control channel used for transmitting the retransmission response signal.