# US 2021/0243686 A1 · Method and apparatus for selecting an access and mobility management function in a mobile communication system

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- Number: US 2021/0243686 A1
- Document ID: US20210243686A1
- Status: Published application
- Kind: A1
- Application number: 17/237,689
- Filed: 2021-04-22
- Published: 2021-08-05
- Earliest claimed: 2017-01-09
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Youngkyo BAEK; Sunghoon KIM; Hoyeon LEE; Jungje SON
- Web page: https://patentgrep.com/patent/US20210243686A1

## CPC

- H04W 48/18: Selecting a network or a communication service
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 28/088: among core entities
- H04W 48/06: based on traffic conditions
- H04W 72/02: Selection of wireless resources by user or terminal
- H04W 8/02: Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W 8/06: Registration at serving network Location Register, VLR or user mobility server
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 76/10: Connection setup
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present disclosure relates to a communication technique of fusing a 5G communication system for supporting higher data transmission rate beyond a 4G system with an IoT technology and a system thereof, and provides an intelligent service based on the 5G communication technology and the IoT related technology. A method performed by an access network entity in a wireless communication system includes receiving, from a terminal in the wireless communication system, a first message including first information for identifying an AMF, the first information including an AMF set identifier and an AMF identifier; selecting an AMF set based on the AMF set identifier; selecting an AMF from the selected AMF set; and transmitting, to the terminal, a second message as a response to the first message. The AMF set includes a plurality of AMFs based on network slices the AMFs each support, and 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.

## Claims

### Claim 1

A method performed by an access network entity in a wireless communication system, the method comprising:
receiving, from a terminal in the wireless communication system, 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;
selecting an AMF set based on the AMF set identifier;
selecting an AMF from the selected AMF set; and
transmitting, to the terminal, 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.

### Claim 2 (depends on 1)

The method of claim 1, wherein the AMF is selected from the selected AMF set based on at least one of availability of at least one AMF included in the selected AMF set or load balancing across the at least one AMF included in the selected AMF set.

### Claim 3 (depends on 1)

The method of claim 1, wherein the access network entity includes a radio access network entity or a non-3GPP inter-working function (N3IWF) entity.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first message further includes second information for a network slice selection assistance information (NSSAI) requested by the terminal, and
wherein the AMF set is selected based on the second information.

### Claim 5

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.

### Claim 6 (depends on 5)

The method of claim 5, wherein a second AMF is selected from the AMF set based on at least one of availability of at least one AMF included in the AMF set or load balancing across the at least one AMF included in the AMF set.

### Claim 7 (depends on 5)

The method of claim 5, wherein the access network entity includes a radio access network entity or a non-3GPP inter-working function (N3IWF) entity.

### Claim 8 (depends on 5)

The method of claim 5, wherein the first message further includes second information for a network slice selection assistance information (NSSAI) requested by the terminal, and
wherein the second information is considered for selecting the AMF set.

### Claim 9

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.

### Claim 10 (depends on 9)

The access network entity of claim 9, wherein the AMF is selected from the AMF set based on at least one of availability of at least one AMF included in the selected AMF set or load balancing across the at least one AMF included in the selected AMF set.

### Claim 11 (depends on 9)

The access network entity of claim 9, wherein the access network entity includes a radio access network entity or a non-3GPP inter-working function (N3IWF) entity.

### Claim 12 (depends on 9)

The access network entity of claim 9, wherein the first message further includes second information for a network slice selection assistance information (NSSAI) requested by the terminal, and
wherein the AMF set is selected based on the second information for the NSSAI.

### Claim 13

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.

### Claim 14 (depends on 13)

The terminal of claim 13, wherein a second AMF is selected from the AMF set based on at least one of availability of at least one AMF included in the AMF set or load balancing across the at least one AMF included in the AMF set.

### Claim 15 (depends on 13)

The terminal of claim 13, wherein the access network entity includes a radio access network entity or a non-3GPP inter-working function (N3IWF) entity.

### Claim 16 (depends on 13)

The terminal of claim 13, wherein the first message further includes second information for a network slice selection assistance information (NSSAI) requested by the terminal, and wherein the second information for the NSSAI is considered for selecting the AMF set.