# US 12,225,435 B2 · Method and apparatus for supporting multicast service in a wireless communication

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- Number: US 12,225,435 B2
- Document ID: US12225435B2
- Status: Granted
- Kind: B2
- Application number: 18/530,827
- Filed: 2023-12-06
- Published: 2024-03-28
- Granted: 2025-02-11
- Earliest claimed: 2021-02-09
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Youngkyo Baek
- Web page: https://patentgrep.com/patent/US12225435B2

## CPC

- H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W 4/08: User group management
- H04L 12/1863: {comprising mechanisms for improved reliability, e.g. status reports (arrangements for detecting or preventing errors by carrying supervisory signal the return channel H04L1/16)}
- H04L 12/189: {in combination with wireless systems (selective distribution or broadcast in wireless communication networks H04W4/06)}
- H04W 36/0007: {for multicast or broadcast services, e.g. MBMS (multicast or broadcast application services H04W4/06; resource management for broadcast services H04W72/30; connection management for selective distribution or broadcast H04W76/40)}
- H04W 76/11: Allocation or use of connection identifiers
- H04W 76/40: for selective distribution or broadcast
- 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

A method performed by a first entity in a wireless communication system is provided. The method includes receiving a first request message for receiving a multicast service from a second entity, detecting information about a multicast session identifier (ID) from the first request message, requesting information about a fourth entity corresponding to the multicast session ID from a third entity when the first entity does not correspond to the information about the multicast session ID, receiving the information about the fourth entity corresponding to the multicast session ID, identifying the fourth entity based on the information about the fourth entity, transmitting a multicast session join request message to the fourth entity, and receiving a message accepting multicast session join from the fourth entity.

## Claims

### Claim 1

A method performed by a first network entity in a wireless communication system, the method comprising:
in case that there is an existing protocol data unit (PDU) session, receiving, from a user equipment (UE) receiving a service announcement, a PDU session modification request message containing a join request for a multicast/broadcast service (MBS) session;
in case that there is no PDU session established with a data network name (DNN) and a single-network slice selection assistance information (S-NSSAI) for the MBS session, receiving, from the UE, a PDU session establishment request message for a PDU session containing the join request;
transmitting, to a second network entity, the join request; and
receiving, from the second network entity, information about the MBS session and the PDU session,
wherein the service announcement includes a public land mobile network (PLMN) identifier (ID), and
wherein the first network entity is an access management function (AMF) and the second network entity is a session management function (SMF).

### Claim 2 (depends on 1)

The method of claim 1, wherein the service announcement further comprises an MBS session ID, the DNN, and the S-NSSAI.

### Claim 3 (depends on 1)

The method of claim 1, wherein the PDU session modification request message or the PDU session establishment request message further comprises an MBS session ID.

### Claim 4 (depends on 1)

The method of claim 1, wherein a PDU session modification command message is provided to the UE in response to the PDU session modification request message.

### Claim 5

A first network entity in a wireless communication system, the first network entity comprising:
a transceiver; and
a processor coupled with the transceiver and configured to:
in case that there is an existing protocol data unit (PDU) session, receive, from a user equipment (UE) receiving a service announcement, a PDU session modification request message containing a join request for a multicast/broadcast service (MBS) session,
in case that there is no PDU session established with a data network name (DNN) and a single-network slice selection assistance information (S-NSSAI) for the MBS session, receive, from the UE, a PDU session establishment request message for a PDU session containing the join request,
transmit, to a second network entity, the join request, and
receive, from the second network entity, information about the MBS session and the PDU session,
wherein the service announcement includes a public land mobile network (PLMN) identifier (ID), and
wherein the first network entity is an access management function (AMF) and the second network entity is a session management function (SMF).

### Claim 6 (depends on 5)

The first network entity of claim 5, wherein the service announcement further comprises an MBS session ID, the DNN, and the S-NSSAI.

### Claim 7 (depends on 5)

The first network entity of claim 5, wherein the PDU session modification request message or the PDU session establishment request message further comprises an MBS session ID.

### Claim 8 (depends on 5)

The first network entity of claim 5, wherein a PDU session modification command message is provided to the UE in response to the PDU session modification request message.