According to an embodiment of the disclosure, an application function (AF) 125 may be an application function managed by a terminal manufacturer, a service provider, or a public land mobile network (PLMN) operator. However, the AF 125 may also mean other application functions in charge of a radio capability and a radio capability ID as well as the application function managed by the terminal manufacturer.

According to an embodiment of the disclosure, a service communication proxy (SCP) 113 may relay communication with an appropriate NF to NFs by serving as a proxy server in delivery of a 5G core service. According to an embodiment of the disclosure, a network exposure function (NEF) 117 may be a function that provides information about the terminal to a server outside a 5G network. The NEF may provide information required for a service to the 5G network to store the information in a unified data repository (UDR).

According to an embodiment of the disclosure, a user plane function (UPF) 103 may serve as a gateway that delivers a PDU to a DN.

According to an embodiment of the disclosure, a network repository function (NRF) 119 may function to discover an NF.

According to an embodiment of the disclosure, an authentication server function (AUSF) 107 may perform authentication with respect to a terminal on a 3GPP access network and a non-3GPP access network,

According to an embodiment of the disclosure, a network slice selection function (NSSF) 115 may perform a function of selecting a network slice instance provided to the terminal.