Method and terminal for displaying information for using MA PDU session

1. A method for processing protocol data unit (PDU) session establishment by an access and mobility management function (AMF) node, the method comprising:

receiving a PDU session establishment request message from a user equipment (UE) over any one of 3rd Generation Partnership Project (3GPP) access and non-3GPP access,

wherein the PDU session establishment request message including-includes request information indicating a multi-access (MA) PDU session;

selecting a session management function (SMF) node supporting the MA PDU session;

transmitting the PDU session establishment request message to the SMF node supporting the MA PDU session;

receiving PDU session establishment accept message from the SMF node;

transmitting the PDU session establishment accept message to the UE; and

after the MA PDU session has established, receiving a service request message related to the MA PDU session from the UE over one access of the 3GPP access and the non-3GPP access,

transmitting request message for requesting activation of user plane resource of the one access to the SMF node, based on that the service request message is received over the one access, and

wherein the service request message enables the SMF to only activate the user plane resource of the one access.

2. The method of claim 1 , further comprising:

storing context of a PDU session including an access type, and

wherein the access type indicates both of the 3GPP access and the non-3GPP access.

3. The method of claim 1 , wherein the PDU session establishment request message, which is delivered to the SMF node includes information related to whether the UE is registered over both the 3GPP access and the non-3GPP access.

4. The method of claim 1 ,

wherein the service request message includes List Of PDU Sessions To Be Activated related to the MA PDU session.

5. The method of claim 1 , further comprising:

identifying S-NSSAI of the MA PDU session is comprised in allowed NSSAI for corresponding access when the UE is registered over only any one of the 3GPP access and the non-3GPP access and when the UE is registered over another access; and

transmitting a request for release of the MA PDU session to the SMF node when the S-NSSAI of the MA PDU session is comprised in the allowed NSSAI for the corresponding access.

6. The method of claim 1 , further comprising:

receiving a registration request message comprising a list of a PDU session to be activated from the UE when the UE is not registered over the second access; and

delivering necessity of activating the MA PDU session to the SMF node based on the list.

7. A method for processing protocol data unit (PDU) session establishment by a session management function (SMF) node, the method comprising:

receiving, from an access and mobility management function (AMF) node, a PDU session establishment request message from a user equipment (UE),

wherein the PDU session establishment request message includes request information indicating a multi-access (MA) PDU session and information related to whether the UE is registered over both of 3rd Generation Partnership Project (3GPP) access and non-3GPP access;

establishing an MA PDU session over any one of the 3GPP access and the non-3GPP access or over both thereof, based on the information related to the MA PDU session;

transmitting a PDU session establishment accept message to the AMF;

receiving a request message for requesting activation of user plane resource of one access from the AMF node,

wherein the request message is transmitted from the AMF node, based on that the AMF node received a service request message related to the MA PDU session from the UE over the one access of the 3GPP access and the non-3GPP access, after the MA PDU session has established; and

only activating the user plane resource of the one access.

8. The method of claim 7 , wherein the receiving of the PDU session establishment request message comprises receiving one or more of session network slice selection assistance information (S-NSSAI) and allowed NSSAI for each access.

9. The method of claim 7 , further comprising:

transmitting a request for notification to the AMF node in occurrence of a first event in which the UE is registered over the non-3GPP access or in occurrence of a second event of a switch to a connected state occurs when user plane setup for the MA PDU session is performed first over only the 3GPP access; and

receiving a notification from the AMF node when the first event or second event occurs.

10. The method of claim 7 , wherein the PDU session establishment acceptance message comprises information indicating access for which user plane setup is performed among the 3GPP access and the non-3GPP access.

11. The method of claim 7 , further comprising:

transmitting a request for notification to the AMF node in occurrence of a first event in which the UE is registered over the second access or in occurrence of a non-3GPP event of a switch to a connected state occurs in a case where the MA PDU session is generated over only the 3GPP access in the generating of the MA PDU session.

12. An access and mobility management function (AMF) node for processing protocol data unit (PDU) session establishment, the AMF node comprising:

at least one transceiver;

at least one processor; and

at least one computer memory operably connected to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:

receiving a PDU session establishment request message from a user equipment (UE) over any one of 3rd Generation Partnership Project (3GPP) access and non-3GPP access,

wherein the PDU session establishment request message includes request information indicating a multi-access (MA) PDU session;

selecting a session management function (SMF) node supporting the MA PDU session;

transmitting the PDU session establishment request message to the SMF node supporting the MA PDU session;

receiving PDU session establishment accept message from the SMF node;

transmitting the PDU session establishment accept message to the UE; and

after the MA PDU session has established, receiving a service request message related to the MA PDU session from the UE over one access of the 3GPP access and the non-3GPP access,

wherein the service request message enables the SMF to only activate the user plane resource of the one access.