Patent ID: 8228827

Claim:
A method for performing a random access procedure in a mobile communication system, the method comprising: receiving a first message including a random access preamble; transmitting a second message, which is a random access response message, in response to the first message; determining whether or not a third message including a Cell-Radio Network Temporary Identifier (C-RNTI) is received from a User Equipment (UE); transmitting a fourth message, which is a Contention Resolution (CR) message for the random access procedure, to the UE, upon receipt of the third message that does not include the C-RNTI from the UE; and transmitting UE-specific control information to the UE, upon receipt of the third message including the C-RNTI from the UE, wherein the UE-specific control information includes a Cyclic Redundancy Check (CRC) specifically mapped to the C-RNTI of the UE, and wherein the first, second, third, and fourth messages occur in a random access procedure in a mobile communication system.