A terminal apparatus (1, 1A, 1B, 1C) comprising: a receiver configured to receive, from a base station apparatus, a first downlink control information, DCI, format including a channel state information, CSI, field, the first DCI format being used for scheduling of a physical uplink shared channel, PUSCH, in a subframe, receive, from the base station apparatus, a second DCI format including a CSI request field, the second DCI format being used for scheduling of a PUSCH in a slot, and receive, from the base station apparatus, information used for determining a first subband size and a second subband size, the first subband size being for an aperiodic CSI reporting triggered by a CSI request field included in the first DCI format, the second subband size being for an aperiodic CSI reporting triggered by a CSI request field included in the second DCI format; and a transmitter configured to perform on the PUSCH in the subframe, to the base station apparatus, an aperiodic CSI reporting based on a detection of the first DCI format including the CSI request field set to trigger an aperiodic CSI report, and perform on the PUSCH in the slot, to the base station apparatus, the aperiodic CSI reporting based on a detection of the second DCI format including the CSI request field set to trigger the aperiodic CSI report, wherein the first subband size for the aperiodic CSI reporting triggered by the CSI request field included in the first DCI format is given independently from the second subband size for the aperiodic CSI reporting triggered by the CSI request field included in the second DCI format. a receiver configured to receive, from a base station apparatus, a first downlink control information, DCI, format including a channel state information, CSI, field, the first DCI format being used for scheduling of a physical uplink shared channel, PUSCH, in a subframe, receive, from the base station apparatus, a second DCI format including a CSI request field, the second DCI format being used for scheduling of a PUSCH in a slot, and receive, from the base station apparatus, information used for determining a first subband size and a second subband size, the first subband size being for an aperiodic CSI reporting triggered by a CSI request field included in the first DCI format, the second subband size being for an aperiodic CSI reporting triggered by a CSI request field included in the second DCI format; and receive, from a base station apparatus, a first downlink control information, DCI, format including a channel state information, CSI, field, the first DCI format being used for scheduling of a physical uplink shared channel, PUSCH, in a subframe, receive, from the base station apparatus, a second DCI format including a CSI request field, the second DCI format being used for scheduling of a PUSCH in a slot, and receive, from the base station apparatus, information used for determining a first subband size and a second subband size, the first subband size being for an aperiodic CSI reporting triggered by a CSI request field included in the first DCI format, the second subband size being for an aperiodic CSI reporting triggered by a CSI request field included in the second DCI format; and a transmitter configured to perform on the PUSCH in the subframe, to the base station apparatus, an aperiodic CSI reporting based on a detection of the first DCI format including the CSI request field set to trigger an aperiodic CSI report, and perform on the PUSCH in the slot, to the base station apparatus, the aperiodic CSI reporting based on a detection of the second DCI format including the CSI request field set to trigger the aperiodic CSI report, wherein perform on the PUSCH in the subframe, to the base station apparatus, an aperiodic CSI reporting based on a detection of the first DCI format including the CSI request field set to trigger an aperiodic CSI report, and perform on the PUSCH in the slot, to the base station apparatus, the aperiodic CSI reporting based on a detection of the second DCI format including the CSI request field set to trigger the aperiodic CSI report, wherein the first subband size for the aperiodic CSI reporting triggered by the CSI request field included in the first DCI format is given independently from the second subband size for the aperiodic CSI reporting triggered by the CSI request field included in the second DCI format.