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

A method for receiving data by a receiving device in a communication system, the method comprising:

• receiving a first data unit comprising a header and a data portion from a transmitting device, without segmentation of the first data unit;
• transmitting negative acknowledgment (NACK) related to the first data unit;
• and
• receiving at least two data segments from the transmitting device after the NACK is transmitted,
• wherein the at least two data segments are formed by segmenting the data portion of the first data unit, in response to the NACK being received at the transmitting device and an available data size at a retransmission time being smaller than a size of the first data unit, wherein each of the at least two data segments comprises a header and a data field, and
• wherein the data portion of the first data unit except for the header is mapped to at least two data fields of the at least two data segments.

An apparatus for transmitting data in a transmitting device of a communication system, the apparatus comprising:

• a transceiver configured to transmit a first data unit comprising a header and a data portion to a receiving device, without segmentation of the first data unit, and receive negative acknowledgement (NACK) related to the first data unit from the receiving device;
• and
• a processor configured to:
• segment the data portion of the first data unit to form at least two data segments in response to the NACK being received and an available data size at a retransmission time being smaller than a size of the first data unit, wherein each of the at least two data segments comprises a header and a data field,
• wherein the transceiver is further configured to transmit the at least two data segments to the receiving device in response to receiving the NACK, and
• wherein the data portion of the first data unit except for the header is mapped to at least two data fields of the at least two data segments.