Patent ID: 8774221

Claim:
A method for reporting buffer status of a User Equipment (UE) in a mobile communication system, the method comprising: being allocated a transmission resource from a node B; determining a buffer state report related to a Logical Control Group (LCG) by a Medium Access Control (MAC) layer to add to a reserved bit region of a first MAC subheader through an N-th MAC subheader using the transmission resource; generating a MAC Protocol Data Unit (PDU) by concatenating the first MAC subheader through the N-th MAC subheader with corresponding payload elements; and transmitting the generated MAC PDU, wherein the first MAC subheader includes at least one of: buffer status of an LCG corresponding to an identifier of an LCG relating to the first MAC subheader; LCG buffer status of an identifier of an LCG relating to the first MAC subheader; and entire buffer status of the UE.