A terminal apparatus for communicating with a base station apparatus , the terminal apparatus comprising: a transmitter configured to transmit uplink data on a physical uplink shared channel, PUSCH; a receiver configured to receive radio resource control, RRC, information, on a physical downlink shared channel, PDSCH, and a downlink control information, DCI, format for schedule-based transmission of the uplink data, wherein the RRC information includes resource information on radio resources configured in advance for transmission of the uplink data in a grant free access, a number of hybrid automatic repeat request, HARQ, processes in the radio resources, a period of the radio resources and a timeout period for the transmission of the uplink data, the resource information for the transmission of the uplink data includes symbol information for the transmission of the uplink data; and a control unit configured to determine a HARQ process ID based on the symbol information for the transmission of the uplink data, the period, and the number of HARQ processes; wherein the transmitter transmits the uplink data in the grant free access by using a resource associated with the HARQ process ID, and in a case that the receiver detects the DCI format for retransmission with the HARQ process ID, the transmitter interrupts the transmission in the grant free access with the HARQ process ID during the timeout period, performs schedule-based retransmission with the HARQ process ID by using a prescribed radio resource based on uplink transmission parameters in the DCI format during the timeout period, and resumes transmission of new uplink data in the grant free access with the HARQ process ID after the timeout period. a transmitter configured to transmit uplink data on a physical uplink shared channel, PUSCH; a receiver configured to receive radio resource control, RRC, information, on a physical downlink shared channel, PDSCH, and a downlink control information, DCI, format for schedule-based transmission of the uplink data, wherein the RRC information includes resource information on radio resources configured in advance for transmission of the uplink data in a grant free access, a number of hybrid automatic repeat request, HARQ, processes in the radio resources, a period of the radio resources and a timeout period for the transmission of the uplink data, the resource information for the transmission of the uplink data includes symbol information for the transmission of the uplink data; and a control unit configured to determine a HARQ process ID based on the symbol information for the transmission of the uplink data, the period, and the number of HARQ processes; wherein the transmitter transmits the uplink data in the grant free access by using a resource associated with the HARQ process ID, and in a case that the receiver detects the DCI format for retransmission with the HARQ process ID, the transmitter interrupts the transmission in the grant free access with the HARQ process ID during the timeout period, performs schedule-based retransmission with the HARQ process ID by using a prescribed radio resource based on uplink transmission parameters in the DCI format during the timeout period, and resumes transmission of new uplink data in the grant free access with the HARQ process ID after the timeout period. <EOS>