Patent ID: 8526416

Claim:
A method of performing a polling procedure in a protocol layer performing a data retransmission function in a transmitting side in a wireless communication system, the method comprising: triggering a polling procedure to request a receiving side to transmit a status report, the status report reporting whether at least one data block transmitted from the transmitting side has been successfully received by the receiving side; setting a polling bit of a data block as a polling request bit; and cancelling the triggered polling procedure in case that the status report is received from receiving side before transmitting the polling bit to the receiving side, wherein in the polling procedure, the protocol layer stores a sequence number of a specific data block for which a reception acknowledgement is desired by the transmitting side, and wherein the triggered polling procedure is canceled when transmitting side receives the status report in a state that radio resources for uplink data transmission is not allocated after the polling procedure is triggered and the status report includes the reception acknowledgement for the specific data block.