A method for requesting radio resource using a control signal in an evolved universal telecommunications system (E-UMTS) is disclosed. A terminal requests a radio resource for data transmission from a base station by selectively using the control signal or a random access channel (RACH) if data transmission to the base station is required when the terminal has no uplink radio resource. Fast data transmission is ensured since the terminal can quickly transmit the radio resource request message to the base station using the RACH or the control signal and can quickly acquire the radio resource from the base station.