# US 2024/0205296 A1 · Method and device for supporting alternative network slice in wireless communication system

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- Number: US 2024/0205296 A1
- Document ID: US20240205296A1
- Status: Published application
- Kind: A1
- Application number: 18/589,221
- Filed: 2024-02-27
- Published: 2024-06-20
- Earliest claimed: 2021-10-26
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Dongeun SUH; Hoyeon LEE
- Web page: https://patentgrep.com/patent/US20240205296A1

## CPC

- H04L 67/141: Setup of application sessions (admission control or resource allocation in data switching networks H04L47/70)
- H04L 67/51: Discovery or management thereof, e.g. service location protocol [SLP] or web services
- H04W 76/12: Setup of transport tunnels
- H04L 67/146: Markers for unambiguous identification of a particular session, e.g. session cookie or URL-encoding
- H04W 88/14: Backbone network devices
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Provided is a method of solving a problem in which PDU session creation is rejected due to an NSAC in a wireless communication system according to an embodiment of the disclosure through alternative S-NSSAI.

## Claims

### Claim 1

A method performed by a terminal in a wireless communication system, the method comprising:
transmitting, to an access and mobility management function (AMF), a message for requesting an establishment of a protocol data unit (PDU) session associated with a network slice; and
performing the establishment of the PDU session with a session management function (SMF),
wherein in case that the network slice is to be replaced with an alternative network slice, information on the alternative network slice is received from the SMF, and
wherein the alternative network slice is selected from at least one allowed network slice.

### Claim 2 (depends on 1)

The method of claim 1, wherein the message comprises information on the network slice and the information on the network slice comprises single-network slice selection assistance information (S-NSSAI) of the network slice.

### Claim 3 (depends on 1)

The method of claim 1, wherein information on at least one network slice and information on at least one alternative network slice associated with each of the at least one network slice is stored in a unified data management (UDM).

### Claim 4 (depends on 1)

The method of claim 1, wherein in case that the network slice is to be replaced with the alternative network slice, the SMF is selected based on the alternative network slice.

### Claim 5 (depends on 2)

The method of claim 2, wherein the message further comprises at least one of a request data network name (DNN), a PDU session identity, or a PDU session establishment request message.

### Claim 6 (depends on 1)

The method of claim 1, wherein, in case that a number of established PDU session is equal to a maximum number of PDU sessions for the network slice or a number of registered terminals is equal to a maximum number of available terminals for the network slice, the network slice is to be replaced to the alternative network slice.

### Claim 7

A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
a controller configured to:
transmit, to an access and mobility management function (AMF) via the transceiver, a message for requesting an establishment of a protocol data unit (PDU) session associated with a network slice, and
perform the establishment of the PDU session with a session management function (SMF)
wherein in case that the network slice is to be replaced with an alternative network slice, information on the alternative network slice is received from the SMF, and
wherein the alternative network slice is selected from at least one allowed network slice.

### Claim 8 (depends on 7)

The terminal of claim 7, wherein the message comprises information on the network slice and the information on the network slice comprises single-network slice selection assistance information (S-NSSAI) of the network slice.

### Claim 9 (depends on 7)

The terminal of claim 7, wherein information on at least one network slice and information on at least one alternative network slice associated with each of the at least one network slice is stored in a unified data management (UDM).

### Claim 10 (depends on 7)

The terminal of claim 7, wherein in case that the network slice is to be replaced with the alternative network slice, the SMF is selected based on the alternative network slice.

### Claim 11 (depends on 8)

The terminal of claim 8, wherein the message further comprises at least one of a request data network name (DNN), a PDU session identity, or a PDU session establishment request message.

### Claim 12 (depends on 7)

The terminal of claim 7, wherein, in case that a number of established PDU session is equal to a maximum number of PDU sessions for the network slice or a number of registered terminals is equal to a maximum number of available terminals for the network slice, the network slice is to be replaced to the alternative network slice.