Non-IP data delivery authorization update method and connection release method for non-IP data delivery, and device for performing the method

1. A method of connection establishment between a Session Management Function (SMF) device and the Network Exposure Function (NEF) device, performed by the NEF device, the method comprising:

receiving a request message for creating a session management context from the SMF device; and

transmitting a response message for creating the session management context to the SMF device for a Protocol Data Unit (PDU) session establishment,

wherein, when an UE (user equipment) performs the PDU session establishment with a PDU session type of unstructured, and subscription information corresponding to the UE requested DNN (Data Network Name) includes a NEF identify for NIDD (Non-IP Data Delivery), the method of connection establishment between a Session Management Function (SMF) device and the Network Exposure Function (NEF) device toward the NEF device corresponding to a NEF ID for the DNN and S-NSSAI (Single Network Slice Selection Assistance Information) is initiated.

2. The method of claim 1 , wherein the NEF device generates NEF PDU session context when the request message, and associates the NEF PDU session context with a user identify (ID) and a PDU session ID.

3. The method of claim 1 , wherein the request message includes a user ID, a PDU session ID, a NEF device ID, Non-IP Data Delivery (NIDD) information, S-NSSAI (Single Network Slice Selection Assistance Information), or Data Network Name (DNN),

wherein the response message includes the user ID, the PDU session ID, the NEF device ID, the NIDD information, the S-NSSAI and DNN.

4. A method of a connection release between a Session Management Function (SMF) device and a Network Exposure Function (NEF) device, performed by the NEF device, the method comprising:

receiving a request message for deleting a session management context from the SMF device; and

transmitting a response message for deleting the session management context to the SMF device,

wherein the request message includes User Identity (ID), Protocol Data Unit (PDU) session ID, NEF device ID, Single Network Slice Selection Assistance Information (S-NSSAI) or Data Network Name (DNN), and

wherein the response message includes User Identity, PDU session ID, NEF device ID, S-NSSAI or DNN.

5. A method of a connection release between a Session Management Function (SMF) device and a Network Exposure Function (NEF) device, performed by the NEF device, the method comprising:

receiving a first request message for deleting a NIDD (Non-IP Data Delivery) configuration from an Application Function (AF) device;

transmitting a first response message for deleting the NIDD configuration to the AF device;

transmitting a second request message for notifying deletion of a session management context to the SMF device; and

receiving a second response for notifying deletion of a session management context message form the SMF device.

6. The method of claim 5 , wherein the first request message includes TLTRI (T8 Long Term Transaction Reference ID) to indicate that SMF-NEF connection for a User's NIDD is no longer needed,

wherein the first response message is to acknowledge a deletion of a NIDD configuration.

7. The method of claim 5 , wherein the second request message is message to notify a deletion of SM (Session Management) context information,

wherein the second response message is message to acknowledge a notification for deletion of the SM (Session Management) context information.

8. A method of a connection release between a Session Management Function (SMF) device and a Network Exposure Function (NEF) device, performed by the NEF device, the method comprising:

determining whether to release the corresponding SMF-NEF connection based on a NIDD (Non-IP Data Delivery) authorization update;

transmitting a request message for notifying deletion of a session management context to the SMF device; and

receiving a response message for notifying deletion of the session management context from the SMF device.

9. The method of claim 8 , wherein the request message is a message to notify a deletion of SM context information,

wherein the response message is a message to acknowledge a notification for the deletion of the SM context information.