Abstract: A terminal according to an aspect of the present disclosure includes a receiving section that receives downlink control information (DCI) for scheduling a downlink shared channel, and a control section that, when a maximum length of a demodulation reference signal (DMRS) for the downlink shared channel is 1, determines a combination of five or more ports for the DMRS, based on an antenna port field of the DCI. According to an aspect of the present disclosure, it is possible to appropriately perform communication with more than 4 layers, based on a single-symbol DMRS.

Abstract: A mobile terminal apparatus and a radio communication method are provided which can efficiently transmit feedback control information through a physical uplink control channel. The radio communication method according to the present invention uses a plurality of ACK/NACK control bits as data signals, adds cyclic shifts to a plurality of reference signal blocks of a plurality of time blocks in a physical uplink control channel format comprised of a plurality of time blocks, multiplies the plurality of reference signal blocks by orthogonal codes and transmits a control channel signal including reference signals by which orthogonal codes are multiplied to a radio base station apparatus through a physical uplink control channel.