Disclosed are a method for reentering the network of a no-mobility idle state mobile station and a method for supporting same. A device for supporting the reentry into the network of a no-mobility idle state mobile station in a wireless communication system of the present invention comprises a transmitter for transmitting to the no-mobility idle state mobile station a first information including information on whether an uplink region has been allocated just for the no-mobility idle state mobile station. The first information can further include information on the allocated uplink region. The mobile station for executing the reentry into the network of the present invention comprises a receiver for receiving from a base station a first information including information on whether an uplink area has been allocated just for the no-mobility idle state mobile station. The first information can further include information on the allocated uplink region.