# US 11,122,532 B2 · Method for transceiving signal in association with multi-homing based PSA addition in wireless communication system and apparatus therefor

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- Number: US 11,122,532 B2
- Document ID: US11122532B2
- Status: Granted
- Kind: B2
- Application number: 16/618,096
- Filed: 2018-05-29
- Published: 2020-05-14
- Granted: 2021-09-14
- Earliest claimed: 2017-05-29
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Laeyoung Kim
- Web page: https://patentgrep.com/patent/US11122532B2

## CPC

- H04W 60/005: {Multiple registrations, e.g. multihoming}
- H04W 76/12: Setup of transport tunnels
- H04L 61/5007: Internet protocol [IP] addresses
- H04L 65/1016: IP multimedia subsystem [IMS]
- H04L 65/1069: Session establishment or de-establishment
- H04L 65/1073: Registration or de-registration
- H04W 8/26: Network addressing or numbering for mobility support
- H04L 65/1104: Session initiation protocol [SIP]
- H04L 2101/659: Internet protocol version 6 [IPv6] addresses
- H04L 2101/677: Multiple interfaces, e.g. multihomed nodes
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

An embodiment of the present invention relates to a method for transceiving a signal, by a user equipment (UE), in association with multi-homing based PSA addition in a wireless communication system, the method comprising the steps of: establishing a protocol data unit (PDU) session with a first protocol data unit session anchor (PSA); and receiving a new IP address from a session management function (SMF), wherein when the received new IP address is associated with multi-homing based PSA addition, the UE skips performing IMS registration using the new IP address.

## Claims

### Claim 1

A method of receiving signals in relation to multi-homing-based protocol data unit session anchor (PSA) addition by a user equipment (UE) in a wireless communication system, the method comprising:
establishing, by the UE, a protocol data unit (PDU) session with a first PSA;
receiving, by the UE from a session management function (SMF), a new Internet protocol (IP) address; and
receiving information informing that the new IP address is related to a multi-homing-based PSA addition,
wherein, based on the received information informing that the new IP address is related to the multi-homing-based PSA addition:
an IP multimedia subsystem (IMS) registration using the new IP address is skipped; and
a non-access stratum (NAS) layer of the UE provides an upper layer with information indicating that the new IP address is for IMS media routing.

### Claim 2 (depends on 1)

The method according to claim 1, wherein based on that the received new IP address is related to the multi-homing-based PSA addition, the new IP address is used for IMS media routing to an added second PSA.

### Claim 3 (depends on 1)

The method according to claim 1, wherein based on that the received new IP address is related to the multi-homing-based PSA addition, the NAS layer of the UE provides the upper layer with information indicating that the new IP address is only for IMS media.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the new IP address is a new IP version 6 (IPv6) prefix.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the upper layer is an IMS layer.

### Claim 6 (depends on 2)

The method according to claim 2, wherein the second PSA is a localized user plane function (UPF).

### Claim 7 (depends on 1)

The method according to claim 1, wherein the first PSA is a user plane function (UPF).

### Claim 8

A user equipment (UE) for transmitting and receiving signals in relation to multi-homing-based protocol data unit session anchor (PSA) addition in a wireless communication system, the UE comprising:
a memory;
a transceiver; and
at least one processor operatively coupled to the memory and the transceiver,
wherein the at least one processor is configured to:
establish a protocol data unit (PDU) session with a first PSA;
control the transceiver to receive, from a session management function (SMF), a new Internet protocol (IP) address; and
control the transceiver to receive information informing that the new IP address is related to a multi-homing-based PSA addition,
wherein, based on the received information informing that the new IP address is related to the multi-homing-based PSA addition:
an IP multimedia subsystem (IMS) registration using the new IP address is skipped; and
a non-access stratum (NAS) layer of the UE provides an upper layer with information indicating that the new IP address is for IMS media routing.

### Claim 9 (depends on 8)

The UE according to claim 8, wherein based on that the received new IP address is related to the multi-homing-based PSA addition, the new IP address is used for IMS media routing to an added second PSA.

### Claim 10 (depends on 8)

The UE according to claim 8, wherein based on that the received new IP address is related to the multi-homing-based PSA addition, the NAS layer of the UE provides the upper layer with information indicating that the new IP address is only for IMS media.