Patent ID: 8665837

Claim:
A method for a network to acquire information regarding a situation occurring at a user equipment (UE) using a variable having a specific value in a mobile communication system, the method comprising: transmitting a first grant message to the UE, wherein the network uses either an absolute grant or a relative grant in the first grant message; receiving data from the UE in a form of a medium access control protocol data unit (MAC PDU) via radio resources allocated to the UE by the first grant message; receiving scheduling information with the variable having the specific value from the UE, wherein, based on the received scheduling information with the variable having the specific value, the network acknowledges a situation that there is no more data to configure a new MAC PDU at the UE, the UE has only one MAC PDU left in a buffer to transmit (last MAC PDU), and the UE shall release the radio resources allocated to the UE after transmitting the scheduling information and the last MAC PDU to the network; transmitting a second grant message to the UE in response to the scheduling information, wherein the network uses only the absolute grant in the second grant message; and receiving the last MAC PDU from the UE via radio resources allocated to the UE by the second grant message.