Method and apparatus for determining whether to perform transmission on a random access or a configured grant in wireless communication system

1. A method performed by a wireless device in a wireless communication system, the method comprising:

receiving a configuration for a configured grant including an information on a TimeAlignmentTimer (TAT) for the configured grant from a network, upon leaving a connected state with the network;

starting the TAT for the configured grant;

determining whether a first condition for transmission of a data using an Early Data Transmission (EDT) procedure is met, wherein the first condition includes that EDT is indicated by a system information; and

determining whether a second condition for transmission of the data using the configured grant is met, wherein the second condition includes that (i) the amount of the data is smaller than or equal to a maximum amount of data configured for transmission using the configured grant, and (ii) the TAT for the configured grant is running;

wherein the method further comprises any one of

(1) based on that the first condition is met: transmitting the data to the network using the EDT, wherein the data is included in an RRCEarlyDataRequest message;

(2) based on that the second condition is met: transmitting the data to the network using the configured grant; or

(3) based on that both the first condition and the second condition are not met: transmitting an RRCConnectionRequest message to the network.

2. The method of claim 1 , wherein the configuration for the configured grant includes an identity of the wireless device for uplink transmission or downlink reception with the configured grant.

3. The method of claim 1 , wherein the method further comprises,

while in leaving the connected state:

selecting a cell on the network; and

camping on the cell.

4. The method of claim 1 , wherein the wireless device is an autonomous driving apparatus in communication with at least one of a mobile terminal, a network, and/or autonomous vehicles other than the wireless device.

5. A wireless device in a wireless communication system, the wireless device comprising:

at least one memory;

at least one transceiver; and

at least one processor, operably coupled to the at least one memory and the at least one transceiver, and configured to:

receive a configuration for a configured grant including an information on a TimeAlignmentTimer (TAT) for the configured grant from a network, upon leaving a connected state with the network;

start the TAT for the configured grant;

determine whether a first condition for transmission of a data using an Early Data Transmission (EDT) procedure is met, wherein the first condition includes that EDT is indicated by a system information; and

determine a second condition for transmission of the data using the configured grant is met, wherein the second condition includes that (i) the amount of the data is smaller than or equal to a maximum amount of data configured for transmission using the configured grant, and (ii) the TAT for the configured grant is running;

wherein the processor is further configured to perform any one of

(1) based on that the first condition is met: transmitting the data to the network using the EDT, wherein the data is included in an RRCEarlyDataRequest message;

(2) based on that the second condition is met: transmitting, to the network, the data using the configured grant; or

(3) based on that both the first condition and the second condition are not met: transmitting an RRCConnectionRequest message to the network.