Patent ID: 8660068

Claim:
A method for constructing a status protocol data unit (PDU) for providing a positive acknowledgement (ACK) and a negative acknowledgement (NACK) of acknowledged mode data (AMD) PDUs of radio link control (RLC) PDUs or portions of the RLC PDUs in a mobile communications system, the method comprising: receiving, by a device, size information on a total size of at least one RLC PDU; constructing, by the device, a status PDU for AMD PDUs by considering the total size of the at least one RLC PDU, the status PDU including sequence numbers that include a sequence number (SN) of a receive state variable and at least one sequence number between the sequence number of the receive state variable and a sequence number of a maximum status transmit state variable such that the constructed status PDU includes following sequence: an Acknowledgement Sequence Number (ACK SN) to indicate the maximum status transmit state variable followed by a first Negative Acknowledgement Sequence Number (NACK SN) for a first AMD PDU of the AMD PDUs followed by a NACK_SN element, the NACK_SN element comprising a second NACK_SN, a segment offset start (SOstart) and a segment offset end (SOend) for a partly received AMD PDU of the AMD PDUs; and transmitting, by the device, the constructed status PDU.