A terminal apparatus includes a receiver configured to monitor a PDCCH with a DCI format on an active downlink BWP in a serving cell in a Secondary Cell Group (SCG), the DCI format being used for scheduling a PDSCH, and receive the PDSCH on the downlink BWP, and a transmitter configured to transmit a HARQ-ACK on a PUCCH. A value N RFV of a frequency domain resource allocation field included in the DCI format is equal to N size BWP ∗ (L RBs - 1) + RB start , in a case that L RBs -1 is equal to or smaller than floor(N size BWP /2), the value N RIV is equal to N size BWP ∗ (N size BWP - L RBs + 1) + (N size BWP - 1 - RB start ) in a case that L RBs - 1 is larger than floor(N size BWP /2), the floor(N size BWP /2) represents a largest integer within a range that does not exceed N size BWP /2, the RB start is a starting resource block for allocation of the PDSCH, the L RBs is a number of resource blocks allocated to the PDSCH, and the N size BWP is given based on the number of resource blocks in an initial downlink BWP configured by a first parameter in a case that the DCI format is detected in a common search space.