Method and apparatus for performing EDT
Provided are a method for a user equipment (UE) to perform early data transmission (EDT) in a wireless communication, and an apparatus supporting the same. The method may include: transmitting a first radio resource control (RRC) message for the EDT, to a base station; receiving a second RRC message in response to the first RRC message, from the base station; if the second RRC message indicates that the EDT is successful, considering that the EDT ends successfully; if the second RRC message indicates that the EDT is unsuccessful, considering that the EDT ends unsuccessfully; and entering a RRC_IDLE state.
1. A method for performing, by a user equipment (UE), early data transmission (EDT) in a wireless communication, the method comprising:
receiving, from a base station (BS), system information including information which informs the UE that the EDT is allowed;
transmitting a random access preamble to the BS;
receiving a random access response (RAR) message from the BS;
in response to the RAR message, transmitting, to the BS, a first radio resource control (RRC) message for initiating the EDT, based on the system information;
in response to the first RRC message, receiving, from the BS, a second RRC message related to a success of the EDT; and
based on the second RRC message related to the success of the EDT, entering a RRC_IDLE state.
2. The method of claim 1 , further comprising:
suspending radio bearer for the EDT before entering the RRC_IDLE state.
3. The method of claim 1 , wherein entering the RRC_IDLE state comprises:
keeping the RRC_IDLE state without transmitting a third RRC message to the BS in response to the second RRC message.
4. The method of claim 1 , further comprising:
based on the second RRC message related to the success of the EDT, determining that the EDT is completed successfully.
5. The method of claim 3 , wherein the third RRC message is one of a RRC connection setup complete message or a RRC connection resume complete message.
6. The method of claim 1 , wherein the first RRC message is one of a RRC early data request message, a RRC connection request message or a RRC connection resume request message.
7. The method of claim 1 , wherein the second RRC message is one of a RRC early data complete message, a RRC connection setup message, a RRC connection resume message or a RRC connection reject message.
8. The method of claim 1 , wherein a random access procedure for the EDT is initiated by transmitting the first RRC message.
9. The method of claim 8 , wherein the EDT is an uplink data transmission during the random access procedure.
10. The method of claim 1 , wherein the UE is a Narrow Band Internet of Things (NB-IoT) UE.
11. The method of claim 1 , wherein the first RRC message includes an uplink data for the EDT.
12. The method of claim 1 , wherein the UE is configured to communicate with at least one of a mobile terminal, a network or autonomous vehicles other than the UE.
13. A user equipment (UE) configured to perform early data transmission (EDT) in a wireless communication, the UE comprising:
a transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:
receiving, through the transceiver and from a base station (BS), system information including information which informs the UE that the EDT is allowed;
transmitting, through the transceiver and to the BS, a random access preamble;
receiving, through the transceiver and from the BS, a random access response (RAR) message;
in response to the RAR message, transmitting, through the transceiver and to the BS, a first radio resource control (RRC) message for initiating the EDT, based on the system information;
in response to the first RRC message, receiving, through the transceiver and from the BS, a second RRC message related to a success of the EDT; and
based on the second RRC message related to the success of the EDT, entering a RRC_IDLE state.
14. The UE of claim 13 , wherein the operations further comprise:
suspending radio bearer for the EDT before entering the RRC_IDLE state.
15. The UE of claim 13 , wherein entering the RRC_IDLE state comprises:
keeping the RRC_IDLE state without transmitting a third RRC message to the BS in response to the second RRC message.
16. The UE of claim 15 , wherein the third RRC message is one of a RRC connection setup complete message or a RRC connection resume complete message.
17. The UE of claim 13 , wherein the operations further comprise:
determining that the EDT is completed successfully, based on the second RRC message related to the success of the EDT.
18. The UE of claim 13 , wherein the first RRC message is one of a RRC early data request message, a RRC connection request message or a RRC connection resume request message.
19. The UE of claim 13 , wherein the second RRC message is one of a RRC early data complete message, a RRC connection setup message, a RRC connection resume message or a RRC connection reject message.
20. The UE of claim 13 , wherein a random access procedure for the EDT is initiated by transmitting the first RRC message.