Patent ID: 8837522

Claim:
A method of transmitting a medium access control (MAC) protocol data unit (PDU) in a transmitting device, the method comprising the steps of: generating the MAC PDU including a MAC header, an extended header group and a payload; and transmitting the MAC PDU to a receiving device, wherein the MAC header comprises an extended header (EH) field, and the extended header group comprises a MAC PDU length extension field, an extended header length indicator field, and an extended header length field, wherein the EH field indicates presence of the extended header group and the extended header length field indicates a length of the extended header group, wherein if there is no extended header in the MAC PDU, the extended header length indicator field is set to ‘0’, and wherein if the extended header length indicator field is set to ‘0’, the length of the extended header group is equal to a sum of length of extended headers+1.