Patent ID: 8036150

Claim:
A method for use in a cellular communications system comprising: receiving data at a receiving transceiver in the system, said data sent from a sending transceiver in the system, and wherein said data is sent in data units, each of which data unit is given an identifier, and which data units are divided into segments; sending status information in data frames or data units from the receiving transceiver to the sending transceiver, about properly received, partially received, or non-received data units; and wherein sending said status information comprises sending a message comprising: data acknowledging properly received data units or frames in the form of a certain sequence number; an extension indicator of a first type; data regarding a non-received or partially received data unit or frame, in the form of a certain sequence number; an extension indicator of a second type, indicating whether the data unit or units were non-received or partially received; and, in the case of one or more partially received data units, which parts of those data units that were not received, and further wherein said extension indicator of the first type indicates the absence or presence of a set comprising another extension indicator of the first type and another extension indicator of the second type and data regarding a non-received or partially received data unit or frame in the form of the identifier of said data unit or frame.