Patent ID: 7979769

Claim:
A method of performing a random access procedure by a terminal, the method comprising: setting two kinds of maximum number of Hybrid Automatic Repeat reQuest (HARQ) transmissions parameter, wherein a first kind of maximum number of HARQ transmissions parameter is used for transmitting an uplink data according to Random Access Channel (RACH) procedure and a second kind of maximum number of HARQ transmissions parameter is used for transmitting data other than Protocol Data Unit (MAC PDU) stored in a MSG3 buffer; transmitting a random access preamble which is selected at a Medium Access Control (MAC) layer in the terminal; receiving a random access response in response to transmitting the random access preamble; and performing an uplink transmission using an uplink grant included in the random access response, wherein the uplink data includes an identifier of the terminal and the uplink data transmitted using the uplink grant is a MAC PDU, and wherein the uplink transmission is performed by using the first kind of maximum number of HARQ transmissions parameter, which is included in a System Information Block (SIB) received from a base station.