Patent ID: 8054813

Claim:
A method of transmitting service data in a Wireless Local Area Network (WLAN) system, the method comprising: dividing service data transmitted from an upper layer into a plurality of Media Access Control Protocol Data Units (MPDUs) in a Media Access Control (MAC) layer; forming a first and single transmission frame including the plurality of MPDUs destined for a first address, block acknowledgement (ACK) request information identifying each of the plurality of MPDUs and requesting a reception result of each of the plurality of MPDUs in the MAC layer, and delimiter information for distinguishing each of the plurality of MPDUs and also for distinguishing the block ACK request information; adding only a first and single physical (PHY) header to a first MPDU of the first and single transmission frame such that no other header is found in the first and single transmission frame in a physical (PHY) layer and transmitting the first and single PHY header added first and single transmission frame to a recipient; and determining whether the block ACK request information was successfully received by the recipient, wherein, in response to determining that the block ACK was not successfully received, the method further comprises retransmitting the block ACK request information by itself.