Patent ID: 7881236

Claim:
A method of transmitting data by a user equipment through an uplink, the method comprising: receiving an uplink grant (UL Grant) signal from a base station on a specific message; determining whether there is data stored in a message 3 (Msg 3 ) buffer when receiving the UL Grant signal on the specific message; determining whether the specific message is a random access response message; transmitting the data stored in the Msg 3 buffer to the base station using the UL Grant signal received on the specific message, if there is data stored in the Msg 3 buffer when receiving the UL Grant signal on the specific message and the specific message is the random access response message; and transmitting new data to the base station in correspondence with the UL Grant signal received on the specific message, if there is no data stored in the Msg 3 buffer when receiving the UL Grant signal on the specific message or the specific message is not the random access response message.