The invention relates to a receiving unit in a wireless communication network comprising a processing unit being configured to generate Automatic Repeat request (ARQ) feed-back messages for acknowledgement or negative acknowledgement of received data units in a wireless communication channel. In order to avoid signalling overhead, it is proposed that said processing unit is further configured to delay the generation of Automatic Repeat request (ARQ) feedback messages until the processing unit has recognized irregularities in the data transmission or until the number (C) of delayed Automatic Repeat request (ARQ) feedback messages has reached a threshold value.