Method and apparatus for transmitting and receiving status report comprising received status of packet data in a mobile communication system

A method for receiving Packet Data Units (PDUs) at a PDU receiver in a mobile communication system, the method comprising:

• receiving a first PDU comprising a PDU header and a data portion;
• transmitting Negative Acknowledgement (NACK) information for the first PDU;
• and
• receiving one or more PDU segments from a PDU transmitter in response to the transmitting the NACK information,
• wherein the one or more PDU segments are formed by segmenting the first PDU to form the one or more PDU segments if a size of a second PDU for retransmission is smaller than a size of the first PDU, wherein each of the one or more PDU segment comprises a PDU segment header and a data portion.

An apparatus for transmitting Packet Data Units (PDUs) in a PDU transmitter of a mobile communication system, the apparatus comprising:

• a transmitting unit being adapted for transmitting a first PDU comprising a PDU header and a data portion;
• a receiving unit being adapted for receiving Negative Acknowledgement (NACK) information for the first PDU;
• and
• a controller being adapted for segmenting the first PDU to form one or more PDU segments if a size of a second PDU for retransmission is smaller than a size of the first PDU,
• wherein each of the one or more PDU segment comprises a PDU segment header and a data portion, and
• the transmitting unit is adapted for transmitting the one or more PDU segment to a PDU receiver.

An apparatus for receiving Packet Data Units (PDUs) in a PDU receiver of a mobile communication system, the apparatus comprising:

• a receiving unit being adapted for receiving a first PDU comprising a PDU header and a data portion;
• and
• a transmitting unit being adapted for transmitting Negative Acknowledgement (NACK) information for the first PDU,
• wherein the receiving unit is adapted for receiving one or more PDU segments from a PDU transmitting unit in response to the transmitting the NACK information, and
• wherein the one or more PDU segments are formed by segmenting the first PDU to form the one or more PDU segments if a size of a second PDU for retransmission is smaller than a size of the first PDU, wherein each of the one or more PDU segment comprises a PDU segment header and a data portion.