A method for performing a Hybrid Automatic Repeat Request, HARQ, transmission in a downlink from a base station to at least one user equipment, comprising: receiving a HARQ feedback to a HARQ transmission performed with respect to a transport block; determining whether the HARQ feedback is an ambiguous HARQ feedback with respect to a negative acknowledgement or a discontinuous transmission, by identifying that an uplink HARQ feedback represents an acknowledgement for more than one downlink HARQ transmission; and, each time the ambiguous HARQ feedback is received, setting the ambiguous HARQ feedback as the negative acknowledgement or the discontinuous transmission based on the number of HARQ transmissions having been performed and the corresponding received HARQ feedbacks within a target number of HARQ transmissions counting from a first HARQ transmission, characterised in that the target number is two and the step of the setting comprises one of the following: setting a first received HARQ feedback as the negative acknowledgement if it is ambiguous; setting a second received HARQ feedback as the discontinuous transmission if the first received HARQ feedback is the negative acknowledgement and the second received HARQ feedback is ambiguous; setting the second received HARQ feedback as the discontinuous transmission if the first and the second received HARQ feedbacks are both ambiguous; and setting the second received HARQ feedback as the negative acknowledgement if the first received HARQ feedback is the discontinuous transmission and the second received HARQ feedback is ambiguous. receiving a HARQ feedback to a HARQ transmission performed with respect to a transport block; determining whether the HARQ feedback is an ambiguous HARQ feedback with respect to a negative acknowledgement or a discontinuous transmission, by identifying that an uplink HARQ feedback represents an acknowledgement for more than one downlink HARQ transmission; and, each time the ambiguous HARQ feedback is received, setting the ambiguous HARQ feedback as the negative acknowledgement or the discontinuous transmission based on the number of HARQ transmissions having been performed and the corresponding received HARQ feedbacks within a target number of HARQ transmissions counting from a first HARQ transmission, characterised in that the target number is two and the step of the setting comprises one of the following: setting a first received HARQ feedback as the negative acknowledgement if it is ambiguous; setting a second received HARQ feedback as the discontinuous transmission if the first received HARQ feedback is the negative acknowledgement and the second received HARQ feedback is ambiguous; setting the second received HARQ feedback as the discontinuous transmission if the first and the second received HARQ feedbacks are both ambiguous; and setting the second received HARQ feedback as the negative acknowledgement if the first received HARQ feedback is the discontinuous transmission and the second received HARQ feedback is ambiguous. setting a first received HARQ feedback as the negative acknowledgement if it is ambiguous; setting a second received HARQ feedback as the discontinuous transmission if the first received HARQ feedback is the negative acknowledgement and the second received HARQ feedback is ambiguous; setting the second received HARQ feedback as the discontinuous transmission if the first and the second received HARQ feedbacks are both ambiguous; and setting the second received HARQ feedback as the negative acknowledgement if the first received HARQ feedback is the discontinuous transmission and the second received HARQ feedback is ambiguous.