# US 12,225,604 B2 · Method and apparatus for supporting various services in wireless communication system

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- Number: US 12,225,604 B2
- Document ID: US12225604B2
- Status: Granted
- Kind: B2
- Application number: 18/393,308
- Filed: 2023-12-21
- Published: 2024-04-11
- Granted: 2025-02-11
- Earliest claimed: 2019-06-14
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Sangsoo Jeong; Hoyeon Lee
- Web page: https://patentgrep.com/patent/US12225604B2

## CPC

- H04W 76/12: Setup of transport tunnels
- H04W 76/16: Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
- H04W 60/06: De-registration or detaching
- H04W 76/34: Selective release of ongoing connections
- H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals
- 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 5th generation (5G) or pre-5G communication system for supporting a data transmission rate higher than that of a 4th generation (4G) system, such as long-term evolution (LTE). The disclosure provides a method for operating a terminal in a wireless communication system, the method including: performing communication with an access and mobility management function (AMF) in a first network; and transmitting a radio resource control (RRC) message including information on the AMF in a second network.

## Claims

### Claim 1

A method for operating a network node in a wireless communication system, the method comprising:
receiving, from a user equipment (UE) supporting a first radio access technology (RAT) and a second RAT, a deregistration request message;
determining whether a usage reporting for the second RAT is required for a protocol data unit (PDU) session established for the UE;
in case that the usage reporting for the second RAT is required for the PDU session, transmitting, to the UE, a deregistration accept message, and transmitting, to a radio access node (RAN) associated with the UE, a N2 UE context release request message for a N2 signaling connection release;
waiting for completion of the N2 signaling connection release, to receive the usage reporting for the second RAT from the RAN; and
transmitting, to a session management function (SMF), a PDU session release request message to release the PDU session.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
during completion of the N2 signaling connection release, receiving, from the RAN, usage data reporting for the second RAT.

### Claim 3 (depends on 1)

The method of claim 1, wherein the deregistration request message includes at least one of a 5th generation-globally unique temporary identifier (5G-GUTI), a deregistration type, or an access type.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
in case that the usage reporting for the second RAT is not required for the PDU session, transmitting, to a session management function (SMF), a PDU session release request message to release the PDU session; and
receiving, from the SMF, a PDU session release response message.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
identifying the protocol data unit (PDU) session established for the UE.

### Claim 6

A network node in a wireless communication system, the network node comprising:
a transceiver; and
at least one processor coupled with the transceiver and configured to:
receive, from a user equipment (UE) supporting a first radio access technology (RAT) and a second RAT, a deregistration request message;
determine whether a usage reporting for the second RAT is required for a protocol data unit (PDU) session established for the UE;
in case that the usage reporting for the second RAT is required for the PDU session, transmit, to the UE, a deregistration accept message, and transmit, to a radio access node (RAN) associated with the UE, a N2 UE context release request message for a N2 signaling connection release;
wait for completion of the N2 signaling connection release, to receive the usage reporting for the second RAT from the RAN; and
transmit, to a session management function (SMF), a PDU session release request message to release the PDU session.

### Claim 7 (depends on 6)

The network node of claim 6, wherein the at least one processor is further configured to:
during completion of the N2 signaling connection release, receive, from the RAN, usage data information for the second RAT.

### Claim 8 (depends on 6)

The network node of claim 6, wherein the deregistration request message includes at least one of a 5th generation-globally unique temporary identifier (5G-GUTI), a deregistration type, or an access type.

### Claim 9 (depends on 6)

The network node of claim 6, wherein the at least one processor is further configured to:
in case that the usage reporting for the second RAT is not required for the PDU session, transmit, to a session management function (SMF), a PDU session release request message to release the PDU session and receive, from the SMF, a PDU session release response message.

### Claim 10 (depends on 6)

The network node of claim 6, wherein the at least one processor is further configured to:
identify the protocol data unit (PDU) session established for the UE.