# US 2025/0168801 A1 · Network registration method for traffic transmission and device supporting same

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- Number: US 2025/0168801 A1
- Document ID: US20250168801A1
- Status: Published application
- Kind: A1
- Application number: 18/841,307
- Filed: 2023-03-16
- Published: 2025-05-22
- Earliest claimed: 2022-03-25
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Myungjune YOUN; Hyunsook KIM; Laeyoung KIM
- Web page: https://patentgrep.com/patent/US20250168801A1

## CPC

- H04W 60/005: {Multiple registrations, e.g. multihoming}
- H04W 76/12: Setup of transport tunnels
- H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W 60/06: De-registration or detaching
- H04W 76/10: Connection setup
- H04W 76/16: Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W 88/14: Backbone network devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Provided are a network registration method for traffic transmission and a device supporting same. A user equipment (UE) performs a first registration procedure over a first non-3rd generation partnership project (non-3GPP) connection, and transmits a registration request message of a second registration procedure to an access and mobility management function (AMF) over a second non-3GPP connection. The registration request message includes: (i) information about connection switching from the first non-3GPP connection to the second non-3GPP connection; and (ii) information about a multi-access (MA) protocol data unit (PDU) session related to the connection switching. Upon receiving the information, the AMF transmits information about the connection switching from the first non-3GPP connection to the second non-3GPP connection to a session management function (SMF).

## Claims

### Claim 1

A method performed by a User Equipment (UE) adapted to operate in a wireless communication system, the method comprising:
performing a first registration procedure over a first non-3rd Generation Partnership Project (3GPP) access;
establishing a Multi-Access (MA) Protocol Data Unit (PDU) session over the first non-3GPP access;
transmitting a registration request message of a second registration procedure to an Access and mobility Management Function (AMF) over a second non-3GPP access, wherein the registration request message comprises i) information about an access switching from the first non-3GPP access to the second non-3GPP access, and ii) information about the MA PDU session related to the access switching;
establishing a user plane resource with a Session Management Function (SMF) over the second non-3GPP access;
releasing a user plane resource over the first non-3GPP access; and
receiving a registration accept message from the AMF in response to the registration request message.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first non-3GPP access or the second non-3GPP access is any one of an untrusted non-3GPP access, a trusted non-3GPP access, or a wireline access.

### Claim 3 (depends on 1)

The method of claim 1, wherein the method further comprises performing a registration procedure over a 3rd Generation Partnership Project (3GPP) access before performing the access switching.

### Claim 4 (depends on 3)

The method of claim 3, wherein the first non-3GPP access and the 3GPP access belong to a same Public Land Mobile Network (PLMN).

### Claim 5 (depends on 1)

The method of claim 1, wherein the information about the access switching is a registration type in the registration request message set to “non-3GPP access switching” and/or an indicator in the registration request message indicating non-3GPP path switching.

### Claim 6 (depends on 1)

The method of claim 1, wherein establishing the MA PDU session comprises, transmitting a PDU session establishment request message comprising information indicating whether the UE supports the access switching in non-3GPP accesses.

### Claim 7 (depends on 6)

The method of claim 6, wherein establishing the MA PDU session comprises, receiving a PDU session establishment accept message comprising information indicating whether the SMF supports the access switching in non-3GPP accesses, in response to the PDU session establishment request message.

### Claim 8 (depends on 1)

The method of claim 1, wherein the information about the MA PDU session is included within a List Of PDU Sessions To Be Activated in the registration request message.

### Claim 9 (depends on 8)

The method of claim 8, wherein the information about the MA PDU session is included within the List Of PDU Sessions To Be Activated in the registration request message, based on an indication that the access switching in non-3GPP accesses is supported for the MA PDU session.

### Claim 10 (depends on 1)

The method of claim 1, wherein the information about the MA PDU session is included within a separate Information Element (IE) in the registration request message.

### Claim 11 (depends on 1)

The method of claim 1, wherein the first registration procedure is performed with a non-geographically selected AMF over the first non-3GPP access, and
wherein the non-geographically selected AMF is different from the AMF.

### Claim 12 (depends on 1)

The method of claim 1, wherein, the method further comprises considering that the UE is de-registered from the first non-3GPP access and is registered with the second non-3GPP access, based on receiving the registration accept message.

### Claim 13 (depends on 1)

The method of claim 1, wherein the method further comprises performing an access addition procedure and/or service request procedure over the second non-3GPP access for MA PDU sessions for which the access switching from the first non-3GPP access to the second non-3GPP access has not been performed.

### Claim 14

(canceled)

### Claim 15 (depends on 1)

A User Equipment (UE) adapted to operate in a wireless communication system, the UE comprising:
at least one transceiver;
at least one processor; and
at least one memory operably connectable to the at least one processor and storing instructions,
wherein, based on being executed by the at least one processor, the instructions perform operations of the method of claim 1.

### Claim at position 16

16-17. (canceled)

### Claim 18

A method performed by an Access and mobility Management Function (AMF) adapted to operate in a wireless communication system, the method comprising:
performing a first registration procedure for a User Equipment (UE) over a first non-3rd Generation Partnership Project (3GPP) access;
receiving a registration request message of a second registration procedure from the UE over a second non-3GPP access, wherein the registration request message comprises i) information about an access switching from the first non-3GPP access to the second non-3GPP access, and ii) information about a Multi-Access (MA) Protocol Data Unit (PDU) session related to the access switching;
transmitting the information about the access switching from the first non-3GPP access to the second non-3GPP access to a Session Management Function (SMF);
performing an Access Network (AN) release procedure over the first non-3GPP access; and
transmitting a registration accept message to the UE in response to the registration request message.

### Claim at position 18

19-32. (canceled)