Method and apparatus for selecting an access and mobility management function in a mobile communication system

A method performed by a terminal in a wireless communication system, the method comprising:

• transmitting, to an access network entity in the wireless communication system, a first message including first information for indicating a first access and mobility management function (AMF), the first information including an AMF set identifier and an AMF identifier, wherein the AMF set identifier is an identifier of the AMF set, and the AMF identifier is an identifier of an AMF within the AMF set;
• and
• receiving, from the access network entity, a second message as a response to the first message,
• wherein the AMF set includes a plurality of AMFs based on network slices the AMFs each support, and
• wherein the AMF set identifier is used for selection of the AMF set.

An access network entity in a wireless communication system, the access network entity comprising:

• a transceiver;
• and
• a controller configured to:
• receive, from a terminal in the wireless communication system via the transceiver, a first message including first information for identifying an access and mobility management function (AMF), the first information including an AMF set identifier and an AMF identifier,
• select an AMF set based on the AMF set identifier,
• select an AMF from the selected AMF set, and
• transmit, to the terminal, via the transceiver, a second message as a response to the first message,
• wherein the AMF set includes a plurality of AMFs based on network slices the AMFs each support, and
• wherein the AMF set identifier is an identifier of the AMF set, and the AMF identifier is an identifier of an AMF within the AMF set.

A terminal in a wireless communication system, the terminal comprising:

• a transceiver and
• a controller configured to:
• transmit, toward an access network entity, via the transceiver, a first message including first information for indicating a first access and mobility management function (AMF), the first information including an AMF set identifier and an AMF identifier, wherein the AMF set identifier is an identifier of an AMF set, and the AMF identifier is an identifier of an AMF within the AMF set, and
• receive, from the access network entity, via the transceiver, a second message as a response to the first message,
• wherein the AMF set includes a plurality of AMFs based on network slices the AMFs each support, and
• wherein the AMF set identifier is used for selection of the AMF set.