Patent ID: 8281204

Claim:
A method in a receiving node ( 120 ) for sending an acknowledgement/not acknowledgement “ACK/NACK” feedback report of received data units over a radio link, the method comprising the steps of: receiving ( 301 ) data units in a number of subframes over a first radio link from a sending node ( 110 ), creating ( 302 ) a ACK/NACK feedback report, which report is compressed such that it comprises one single ACK/NACK feedback relating to the data units in the number of received subframes, and which report comprises an indicator indicating said number of received subframes, transmitting ( 303 ) the created ACK/NACK feedback report to the sending node ( 110 ) over a second radio link, which feedback report renders it feasible for the sending node ( 110 ) to decide whether a retransmission of any subframe is required or not based on a comparison of the reported number of received subframes with the known transmitted number of subframes per frame, together with the compressed ACK/NACK feedback report.