A wireless transmit/receive unit comprising: a processor configured to: receive a first downlink control information, DCI, associated with a first downlink transmission, wherein the first DCI indicates that a first code block, CB, based hybrid automatic repeat request, HARQ, feedback is to be provided for the first downlink transmission; receive the first downlink transmission that comprises at least one transport block, TB, wherein the at least one TB comprises one or more code block groups, CBGs, and wherein each CBG comprises one or more code blocks; transmit the first CB-based HARQ feedback associated with the first downlink transmission; characterized in that the processor is further configured to: receive a second DCI associated with a second downlink transmission, wherein the second transmission comprises a retransmission of at least a portion of the first downlink transmission; receive the second downlink transmission; and transmit a second CB-based HARQ feedback associated with the second downlink transmission based on a determination that the second DCI indicates that the second CB-based HARQ feedback is to be provided for the second downlink transmission comprising at least a portion of the first downlink transmission. a processor configured to: receive a first downlink control information, DCI, associated with a first downlink transmission, wherein the first DCI indicates that a first code block, CB, based hybrid automatic repeat request, HARQ, feedback is to be provided for the first downlink transmission; receive the first downlink transmission that comprises at least one transport block, TB, wherein the at least one TB comprises one or more code block groups, CBGs, and wherein each CBG comprises one or more code blocks; transmit the first CB-based HARQ feedback associated with the first downlink transmission; receive a first downlink control information, DCI, associated with a first downlink transmission, wherein the first DCI indicates that a first code block, CB, based hybrid automatic repeat request, HARQ, feedback is to be provided for the first downlink transmission; receive the first downlink transmission that comprises at least one transport block, TB, wherein the at least one TB comprises one or more code block groups, CBGs, and wherein each CBG comprises one or more code blocks; transmit the first CB-based HARQ feedback associated with the first downlink transmission; characterized in that the processor is further configured to: receive a second DCI associated with a second downlink transmission, wherein the second transmission comprises a retransmission of at least a portion of the first downlink transmission; receive the second downlink transmission; and transmit a second CB-based HARQ feedback associated with the second downlink transmission based on a determination that the second DCI indicates that the second CB-based HARQ feedback is to be provided for the second downlink transmission comprising at least a portion of the first downlink transmission. receive a second DCI associated with a second downlink transmission, wherein the second transmission comprises a retransmission of at least a portion of the first downlink transmission; receive the second downlink transmission; and transmit a second CB-based HARQ feedback associated with the second downlink transmission based on a determination that the second DCI indicates that the second CB-based HARQ feedback is to be provided for the second downlink transmission comprising at least a portion of the first downlink transmission.