Method and apparatus of uplink transmission in wireless communication system

1. A method of receiving a message by a terminal in a wireless communication system, comprising:

receiving a message from a base station, wherein the message is a paging message or system information received when the terminal is in an idle state;

determining whether or not to initiate a random access procedure based on the presence of an indicator in the message; and

discarding data stored in the terminal for the uplink transmission or data generated for the uplink transmission when the terminal determines not to initiate the random access procedure,

wherein the terminal determines not to initiate the random access procedure if the indicator is included in the message, and the terminal determines to initiate the random access procedure if the indicator is not included in the message,

wherein the indicator is a stop indicator used for stopping the uplink transmission,

wherein the indicator is used for an uplink transmission, and

wherein the data is discarded when the indicator is not included in the message.

2. The method of claim 1 , further comprising,

initiating a random access procedure for the uplink transmission when the terminal determines to initiate the random access procedure; and

transmitting uplink data to the base station.

3. The method of claim 1 , wherein the random access procedure comprises:

transmitting a random access preamble to the base station; and

receiving a random access response from the base station in response to the random access preamble.

4. The method of claim 1 , wherein the message includes an identifier of the terminal or a group identifier of the terminal.

5. The method of claim 1 , wherein the terminal receives the message in an RRC_IDLE state.

6. The method of claim 1 , wherein the message is transmitted on PDCCH (Physical Downlink Control Channel).

7. The method of claim 1 , wherein the stop indicator is for delay tolerant data of the uplink transmission.