Patent ID: 8787369

Claim:
A method of receiving data by a receiving side in a wireless communication system, the method comprising the steps of: receiving a medium access control protocol date unit (MAC PDU) from a transmitting side, the MAC PDU including: at least one of the two or more fragments fragmented from a data block by the transmitting side, a first header containing control information about the MAC PDU which includes the at least one of the two or more fragments, and a fragmentation extended header (FEH) providing information on the data packet fragment, wherein the first header contains an indicator indicating that the FEH is present following the first header, wherein the FEH contains a type field identifying a type of the FEH and the FEH has a variable length depending on whether the fragmented data packet is a real-time data packet or not, and wherein the FEH has a shorter length when the fragmented data packet is the real-time data packet than when the fragmented data packet is a non-real-time data packet; and decoding the received MAC, PDU.