As a wireless communication system evolves from a 4G system to a 5G system, a new core network, an NG core or a 5G core (5GC) network, will be defined. The new core network virtualizes existing network entities (NEs) to form a network function (NF).

According to embodiments of the disclosure, an NF may mean a network entity, a network component, and a network resource.

Referring to FIG. 1, according to an embodiment of the disclosure, a 5GC may include NFs. The 5GC is not limited to the illustration of FIG. 1, and may also include NFs that are more or less than the NFs illustrated in FIG. 1.

According to an embodiment of the disclosure, an access and mobility management function (AMF) 109 may be a network function that manages mobility of the terminal (or user equipment).

According to an embodiment of the disclosure, a session management function (SMF) 111 may be a network function that manages packet data network (PDN) connection provided to the terminal. Herein, PDN connection may be referred to as a protocol data unit (PDU) session.

According to an embodiment of the disclosure, a policy control function (PCF) 121 may be a network function that applies a service policy, a charging policy, and a PDU session policy of a mobile network operator for the terminal.

According to an embodiment of the disclosure, unified data management (UDM) 123 may be a network function that stores information for a subscriber.