A method, for a base station or for a user terminal, for transmission control in a communications system, the method comprising: defining, based on a capability class of the user terminal, a hybrid automatic repeat request profile for the user terminal among a plurality of hybrid automatic repeat request profiles available, the plurality of hybrid automatic repeat request profiles providing different processing times at least at one end of a communication link between the user terminal and the base station; wherein the hybrid automatic repeat request profile indicates - a first time interval between downlink transmission being received in the user terminal and corresponding uplink control information being expected to be transmitted from the user terminal, wherein the uplink control information comprises an acknowledgement message or a negative acknowledgement message for the downlink transmission, and - a second time interval between the uplink control information being transmitted from the user terminal and corresponding downlink retransmission at earliest being expected to be received in the user terminal; or wherein the hybrid automatic repeat request profile indicates - a third time interval between uplink transmission being received in the base station and corresponding downlink information being expected to be transmitted from the base station, wherein the downlink control information comprises an acknowledgement message or a negative acknowledgement message for the uplink transmission, and - a fourth time interval between the downlink information being transmitted from the base station and corresponding uplink retransmission at earliest being expected to be received in the base station; and wherein the method further comprises applying the defined hybrid automatic repeat request profile for communication between the user terminal and the base station. defining, based on a capability class of the user terminal, a hybrid automatic repeat request profile for the user terminal among a plurality of hybrid automatic repeat request profiles available, the plurality of hybrid automatic repeat request profiles providing different processing times at least at one end of a communication link between the user terminal and the base station; wherein the hybrid automatic repeat request profile indicates - a first time interval between downlink transmission being received in the user terminal and corresponding uplink control information being expected to be transmitted from the user terminal, wherein the uplink control information comprises an acknowledgement message or a negative acknowledgement message for the downlink transmission, and - a second time interval between the uplink control information being transmitted from the user terminal and corresponding downlink retransmission at earliest being expected to be received in the user terminal; or - a first time interval between downlink transmission being received in the user terminal and corresponding uplink control information being expected to be transmitted from the user terminal, wherein the uplink control information comprises an acknowledgement message or a negative acknowledgement message for the downlink transmission, and - a second time interval between the uplink control information being transmitted from the user terminal and corresponding downlink retransmission at earliest being expected to be received in the user terminal; or wherein the hybrid automatic repeat request profile indicates - a third time interval between uplink transmission being received in the base station and corresponding downlink information being expected to be transmitted from the base station, wherein the downlink control information comprises an acknowledgement message or a negative acknowledgement message for the uplink transmission, and - a fourth time interval between the downlink information being transmitted from the base station and corresponding uplink retransmission at earliest being expected to be received in the base station; and - a third time interval between uplink transmission being received in the base station and corresponding downlink information being expected to be transmitted from the base station, wherein the downlink control information comprises an acknowledgement message or a negative acknowledgement message for the uplink transmission, and - a fourth time interval between the downlink information being transmitted from the base station and corresponding uplink retransmission at earliest being expected to be received in the base station; and