Granted Patent B2

US 12,732,779 · App. 17/794,802 · Granted Sep 8, 2026

Inventors: Hong Wang (Beijing, CN); Lixiang Xu (Beijing, CN); Weiwei Wang (Beijing, CN)

Assignee: Samsung Electronics Co., Ltd

H04W4/06H04W76/10H04W76/30

Abstract

Claims (28)

1 . A method for transmitting data in a wireless communication system by a anew generation-radio access network (NG-RAN) node, the method comprising:

receiving, from a core network (CN), a first request message including an identifier (ID) of a packet data unit (PDU) session and an ID related to a multicast service;

transmitting, to the CN, a second request message indicating, to the CN, to use a multicast for the multicast service; and

transmitting, from a central unit-control plane (CU-CP) of the NG-RAN node to a distribution unit (DU) of the NG-RAN node, a third request message including the ID related to the multicast service, information about a radio data bearer configuration, and information about an area for the multicast service.

2 . The method of claim 1 , wherein the first request message further includes a data transmission suspension indication indicating whether data transmission is suspended, and wherein, before transmitting the first request message, a multicast transmission channel and a unicast transmission channel is established.

3 . The method of claim 1 , wherein the first message further includes a relationship indication information of the PDU session and the multicast service, and the method further comprises determining whether to use a unicast bearer or a multicast bearer to transmit multicast data by:

during transmitting the multicast data by using the unicast channel, determining to use the multicast bearer to transmit the multicast data based on the relationship indication information.

4 . The method of claim 3 , further comprises:

transmitting, from the CU-CP, a bearer modification request message or a bearer release request message to a user plane (UP) of the NG-RAN node to suspend the unicast bearer; and

receiving, from the CU-CP, a response message from the UP of the NG-RAN node.

5 . The method of claim 3 , wherein determining whether to use the unicast bearer or the multicast bearer to transmit multicast data further comprises:

during transmitting the multicast data by using the multicast channel, counting a number of users in each cell who use the multicast channel to receive the multicast data; and

determining to use the unicast bearer to transmit the multicast data when the number of the users is lower than a predetermined threshold.

6 . An apparatus of a new generation-radio access network (NG-RAN) node for transmitting data in a wireless communication system, the apparatus comprising:

a transceiver; and

a processor coupled to the transceiver and configured to;

receive, from a core network (CN), a first request message including an identifier (ID) of a packet data unit (PDU) session and an ID related to a multicast service,

transmit, to the CN, a second request message indicating, to the CN, to use a multicast for the multicast service, and

transmit, from a central unit-control plane (CU-CP) of the NG-RAN node to a distribution unit (DU) of the NG-RAN node, a third request message including the ID related to the multicast service, information about a radio data bearer configuration, and information about an area for the multicast service.

7 . The apparatus of claim 6 , wherein the first request message further includes a data transmission suspension indication indicating whether data transmission is suspended, and wherein, before transmitting the first request message, a multicast transmission channel and a unicast transmission channel is established.

8 . The apparatus of claim 6 , wherein the first request message further includes a relationship indication information of the PDU session and the multicast service, and

wherein the processor is further configured to determine to use a multicast bearer to transmit the multicast data based on the relationship indication information during transmitting the multicast data by using a unicast channel.

9 . The apparatus of claim 8 , wherein the processor is further configured to:

count a number of users in each cell who use the multicast channel to receive the multicast data during transmitting the multicast data by using the multicast channel, and

determine to use the unicast bearer to transmit the multicast data when the number of the users is lower than a predetermined threshold.

10 . The apparatus of claim 8 , wherein the processor is further configured to:

transmit, from the CU-CP, a bearer modification request message or a bearer release request message to a user plane (UP) of the access network to suspend the unicast bearer, and

receive, by the CU-CP, a response message from the UP of the NG-RAN node.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (39)