Patent ID: 8305901

Claim:
A method of generating a buffer status of a packet data convergence protocol, hereinafter called PDCP, layer for a user equipment in a wireless communication system, the method comprising: including volume information of packets, which have been submitted to a radio link control, hereinafter called RLC, layer and have not been confirmed by the RLC layer due to buffer clearing of the RLC layer of the user equipment, or have not been confirmed by a PDCP status report, in a buffer status report defined as a MAC (Medium Access Control) control element wherein a buffer size field in the Buffer Status Report MAC Control Element identifies the total amount of data available across all logical channels of a logical channel group after a MAC PDU has been built; wherein the buffer clearing of the RLC layer of the user equipment is caused by a re-establishment of the RLC layer or a radio resource control (RRC) connection re-establishment.