Patent ID: 7684439

Claim:
A method for transmitting data in a communication system, the method comprising: generating, by a buffer descriptor (BD) generator, a buffer descriptor (BD) making reference to constituent elements constituting a medium access control (MAC) protocol data unit (PDU), if there is a MAC service data unit (SDU) to be transmitted; generating, by a direct memory access (DMA) controller, the MAC PDU from the MAC SDU according to the BD, wherein the BD includes at least one BD element, and the at least one BD element includes a MAC SDU size field, a header size field, a control field, a header field, and a MAC SDU pointer field, wherein the MAC SDU size field includes size information of the MAC SDU included in the MAC PDU, wherein the header size field includes size information of a header included in the MAC PDU, wherein the control field includes information indicating whether a corresponding BD element has its succeeding BD element, and information indicating whether the corresponding BD element is a start of the MAC PDU, and wherein the header field includes the header included in the MAC PDU.