Method for updating UE configuration in wireless communication system and apparatus for same

1. A method for updating a configuration of user equipment (UE) by an access and mobility management function (AMF) in a wireless communication system, the method comprising:

determining whether at least one UE parameter related to the configuration of the UE needs to be updated;

transmitting a UE configuration update command message to the UE when the at least one UE parameter needs to be updated; and

receiving a UE configuration update complete message from the UE when acknowledgement for the UE configuration update command message is requested,

wherein the UE configuration update command message includes an updated UE parameter and represents whether the UE needs to perform a registration procedure for the updated UE parameter, and

wherein, based on the updated UE parameter including a MICO (Mobile Initiated Connected Only) parameter, the registration procedure is initiated while the UE is in a CONNECTED mode.

2. The method of claim 1 , wherein re-registration of the UE is requested by the UE configuration update command message when the UE needs to perform the registration procedure.

3. The method of claim 1 , wherein re-registration of the UE is not requested by the UE configuration update command message when negotiation between the UE and a network is not required to change the configuration of the UE.

4. The method of claim 1 , wherein the registration procedure is performed to update the configuration of the UE when negotiation between the UE and the network is required to change the configuration of the UE.

5. The method of claim 1 , further comprising indicating a radio access network (RAN) to no longer enter a Radio Resource Control (RRC) inactive mode when the AMF provides RRC inactive assistance information to the RAN such that the RAN is able to use the RRC inactive mode.

6. The method of claim 1 , wherein transmitting the UE configuration update command message further comprises transmitting paging to the UE to switch the UE to the CONNECTED mode when the UE is in an idle mode.

7. The method of claim 1 , further comprising transmitting handover restricted information in which updated mobility restriction has been reflected to a radio access network (RAN) when the updated UE parameter includes the updated mobility restriction.

8. The method of claim 1 , wherein the updated UE parameter includes one or more of mobility restriction, the MICO parameter, allowed network slice selection assistance information (NSSAI), temporary UE ID, a tracking area identity (TAI) list, or network identity and time zone information (NITZ).

9. The method of claim 1 , wherein the UE configuration update command message includes policy information of the UE when updated policy information of the UE is received from a policy control function (PCF).

10. The method of claim 9 , wherein the policy information of the UE includes one or more of an access network discovery and selection policy, a session and service continuity (SSC) mode selection policy, a data network name (DNN) selection policy, or a non-seamless offload policy.

11. A method for updating a configuration of user equipment (UE) in a wireless communication system, the method comprising:

receiving, by the UE, a UE configuration update command message from an access and mobility management function (AMF) without a request of the UE;

transmitting a UE configuration update complete message to the AMF when acknowledgement for the UE configuration update command message is requested; and

initiating a registration procedure when re-registration of the UE is requested by the UE configuration update command message,

wherein the UE configuration update command message includes an updated UE parameter and represents whether the UE needs to perform the registration procedure for the updated UE parameter, and

wherein, based on the updated UE parameter including a MICO (Mobile Initiated Connected Only) parameter, the registration procedure is initiated while the UE is in a CONNECTED mode.

12. The method of claim 11 , wherein, based on the updated UE parameter not including the MICO parameter, the registration procedure is initiated after the UE switches to an idle mode.

13. The method of claim 11 , wherein, based on the updated UE parameter including only network identity and time zone (NITZ) information, the acknowledgement for the UE configuration update command message is not requested.

14. The method of claim 11 , wherein the updated UE parameter includes one or more of mobility restriction, the MICO parameter, allowed network slice selection assistance information (NSSAI), temporary UE ID, a tracking area identity (TAI) list, or network identity and time zone information (NITZ).

15. The method of claim 11 , wherein receiving the UE configuration update command message further comprises receiving paging to switch the UE to the CONNECTED mode from the AMF when the UE is in an idle mode.