Patent ID: 8879399

Claim:
A method for transmitting a status report, the method comprising: receiving, by a receiver, a poll request through a control protocol data unit or control protocol data unit containing a POLL SUper Fleld (POLL_SUFI) for the status report on at least one protocol data unit transmitted from a transmitter, wherein the poll request includes a first sequence number and does not include a data protocol data unit; updating, by the receiver, a second sequence number to one ahead of the first sequence number, if the first sequence number is larger than the second sequence number; determining, by the receiver, the status report by using the updated second sequence number; and transmitting, by the receiver, the status report by using the updated second sequence number to the transmitter, wherein the first sequence number is one less than a sequence number of a next protocol data unit to be transmitted for a first time from the transmitter to the receiver after the transmission of the poll request, wherein the second sequence number is the highest sequence number of a protocol data unit expected to be received in the receiver, and wherein the determining of the status report comprises: if the first sequence number is greater than the second sequence number, determining a status reporting range for the status report based on the first sequence number; and if the second sequence number is greater than the first sequence number, determining a status reporting range for the status report based on the updated second sequence number.