Method and apparatus for controlling UE for cellular IoT service in 5G mobile communication system

1. A method by an Access and Mobility management Function (AMF) in a wireless communication system, the method comprising:

receiving, from a User Equipment (UE), a first message including capability information related to a periodic registration timer indication;

determining whether to apply the periodic registration timer indication to the UE based on the capability information in the first message;

transmitting, to the UE, a second message including the periodic registration timer indication based on the determination;

starting a periodic registration timer after completion of Registration procedure in case that the periodic registration timer indication is provided; and

restarting the periodic registration timer applying the periodic registration timer indication in case that the periodic registration timer expires and the UE is in CONNECTED mode.

2. The method of claim 1 ,

wherein the starting of the periodic registration timer comprises:

starting the periodic registration timer after transmitting the second message to the UE, and

wherein the second message is a Registration Accept message.

3. The method of claim 1 , further comprising:

restarting the periodic registration timer after the UE returns to IDLE mode in case that the periodic registration timer indication is not applied to the UE, the periodic registration timer expires, and the UE is in CONNECTED mode.

4. The method of claim 1 , further comprising:

transmitting, to the UE, a third message including information for updating a periodic registration timer value and the periodic registration timer indication.

5. The method of claim 4 , wherein the third message is a UE Configuration Update Command message, and

wherein the second message further includes a periodic registration timer value.

6. A method performed by a User Equipment (UE) in a wireless communication system, the method comprising:

transmitting, to an Access and Mobility management Function (AMF), a first message including capability information related to a periodic registration timer indication;

receiving, from the AMF, a second message including a periodic registration timer indication based on whether to apply the periodic registration timer indication;

starting a periodic registration timer after completion of Registration procedure in case that the periodic registration timer indication is provided by the AMF; and

restarting the periodic registration timer by applying the periodic registration timer indication in case that the periodic registration timer expires and the UE is in CONNECTED mode,

wherein whether to apply the periodic registration timer indication to the UE is determined based on the capability information in the first message.

7. The method of claim 6 , wherein the starting of the periodic registration timer comprises:

starting the periodic registration timer after transmitting the second message to the UE; and

wherein the second message is a Registration Accept message.

8. The method of claim 6 , wherein further comprising:

restarting the periodic registration timer after the UE returns to IDLE mode in case that the periodic registration timer indication is not applied to the UE, the periodic registration timer expires, and the UE is in CONNECTED mode.

9. The method of claim 6 , further comprising:

receiving, from the AMF, a third message including information for updating a periodic registration timer value and the periodic registration timer indication.

10. The method of claim 9 , wherein the third message is a UE Configuration Update Command message, and

wherein the second message further includes a periodic registration timer value.

11. An Access and Mobility management Function (AMF) in a wireless communication system, the AMF comprising:

a transceiver; and

a controller configured to control the transceiver to:

receive, from a User Equipment (UE), a first message including capability information related to periodic registration timer indication,

determine whether to apply the periodic registration timer indication to the UE based on the capability information in the first message,

transmit, to the UE, a second message including the periodic registration timer indication based on the determination,

start a periodic registration timer after completion of Registration procedure in case that the periodic registration timer indication is provided, and

restart the periodic registration timer by applying the periodic registration timer indication in case that the periodic registration timer expires and the UE is the CONNECTED mode.

12. The AMF of claim 11 , wherein the controller is further configured to start the periodic registration timer after transmitting the second message to the UE, and

wherein the second message is a Registration Accept message.

13. The AMF of claim 11 , wherein the controller is further configured to restart the periodic registration timer after the UE returns to IDLE mode in case that the periodic registration timer indication is not applied to the UE, the periodic registration timer expires, and the UE is in CONNECTED mode.

14. The AMF of claim 11 , wherein the controller is further configured to control the transceiver to transmit, to the UE, a third message including information for updating a periodic registration timer value and the periodic registration timer indication.

15. The AMF of claim 14 , wherein the third message is a UE Configuration Update Command message,

wherein the second message further includes a periodic registration timer value.

16. A User Equipment (UE) in a wireless communication system, the UE comprising:

a transceiver; and

a controller configured to control the transceiver to:

transmit, to an Access and Mobility management Function (AMF), a first message including capability information related to periodic registration timer indication,

receive, from the AMF, a second message including a periodic registration timer indication based on whether to apply the periodic registration timer indication,

start a periodic registration timer indication is provided by the AMF, and

restart the periodic registration timer by applying the periodic registration timer indication in case that the periodic registration timer expires and the UE is in CONNECTED mode,

wherein whether to apply the periodic registration timer indication to the UE is determined based on the capability information in the first message.

17. The UE of claim 16 , wherein the controller is further configured to start the periodic registration timer after transmitting the second message to the UE, and

wherein the second message is a Registration Accept message.

18. The UE of claim 16 , wherein the controller is further configured to restart the periodic registration timer after the UE returns to IDLE mode in case that the periodic registration timer indication is not applied to the UE, the periodic registration timer expires, and the UE is in CONNECTED mode.

19. The UE of claim 16 , wherein the controller is further configured to control the transceiver to receive, from the AMF, a third message including information for updating a periodic registration timer value and the periodic registration timer indication.

20. The UE of claim 19 , wherein the third message is a UE Configuration Update Command message,

wherein the second message further includes a periodic registration timer value.