Method and apparatus for new data arrival of small data transmission in a wireless communication system
A method and device are disclosed from the perspective of a User Equipment (UE). In one embodiment, the UE initiates a Small Data Transmission (SDT) procedure in RRC_INACTIVE state. Furthermore, the UE transmits a Radio Resource Control (RRC) message to network in response to arrival of a first data, to be transmitted to the network, during the SDT procedure, wherein the first data is not allowed to be transmitted via the SDT procedure.
1. A method for a User Equipment (UE), comprising:
initiating a Small Data Transmission (SDT) procedure in RRC_INACTIVE state; and
transmitting a Radio Resource Control (RRC) message to a network in response to arrival of a new data, to be transmitted to the network, during the SDT procedure, wherein the new data belongs to a data radio bearer (DRB) that is not configured for SDT.
2. The method of claim 1 , wherein the RRC message indicates to the network about the arrival of the new data that belongs to the DRB that is not configured for SDT.
3. The method of claim 1 , further comprising:
the UE initiates a RRC resume procedure not for SDT in response to the arrival of the new data.
4. The method of claim 1 , further comprising:
the UE continues the SDT procedure in response to the arrival of the new data.
5. The method of claim 1 , further comprising:
the UE stops the SDT procedure in response to the arrival of the new data.
6. The method of claim 1 , further comprising:
the UE continues the SDT procedure if the UE detects that a second data becomes available for transmission, wherein the second data is allowed to be transmitted via the SDT procedure.
7. The method of claim 1 , further comprising:
the UE stops a timer of controlling duration of the SDT procedure in response to the arrival of the new data.
8. The method of claim 1 , further comprising:
the UE initiates a random access procedure in response to the arrival of the new data.
9. The method of claim 1 , further comprising:
the UE resets Medium Access Control (MAC) in response to the arrival of the new data.
10. The method of claim 1 , wherein the SDT procedure is a RRC resume procedure for SDT.
11. A User Equipment (UE), comprising:
a control circuit;
a processor installed in the control circuit; and
a memory installed in the control circuit and coupled to the processor;
wherein the processor is configured to execute a program code stored in the memory to:
initiate a Small Data Transmission (SDT) procedure in RRC_INACTIVE state; and
transmit a Radio Resource Control (RRC) message to a network in response to arrival of a new data, to be transmitted to the network, during the SDT procedure, wherein the new data belongs to a data radio bearer (DRB) that is not configured for SDT.
12. The UE of claim 11 , wherein the RRC message indicates to the network about the arrival of the new data that belongs to the DRB that is not configured for SDT.
13. The UE of claim 11 , wherein the processor is further configured to execute a program code stored in the memory to:
initiate a RRC resume procedure not for SDT in response to the arrival of the new data.
14. The UE of claim 11 , wherein the processor is further configured to execute a program code stored in the memory to:
continue the SDT procedure in response to the arrival of the new data.
15. The UE of claim 11 , wherein the processor is further configured to execute a program code stored in the memory to:
stop the SDT procedure in response to the arrival of the new data.
16. The UE of claim 11 , wherein the processor is further configured to execute a program code stored in the memory to:
continue the SDT procedure if the UE detects that a second data becomes available for transmission, wherein the second data is allowed to be transmitted via the SDT procedure.
17. The UE of claim 11 , wherein the processor is further configured to execute a program code stored in the memory to:
stop a timer of controlling duration of the SDT procedure in response to the arrival of the new data.
18. The UE of claim 11 , wherein the processor is further configured to execute a program code stored in the memory to:
initiate a random access procedure in response to the arrival of the new data.
19. The UE of claim 11 , wherein the processor is further configured to execute a program code stored in the memory to:
reset Medium Access Control (MAC) in response to the arrival of the first new data.
20. The UE of claim 11 , wherein the SDT procedure is a RRC resume procedure for SDT.