A method performed by a Central Unit, CU, of a Radio Access Network, RAN, node in a wireless communication system, the method comprising, receiving, from an Access and Mobility Function, AMF, a Packet Data Unit, PDU, Session Request message including information for a Multicast and/or Broadcast Service, MBS, wherein the information for the MBS includes (i) a service identity of the MBS, (ii) a Tunnel Endpoint Identifier, TEID, for the MBS, and/or (iii) a flow identity of the MBS; transmitting, to a Distributed Unit, DU, a User Equipment, UE, Context Request message including the information for the MBS; establishing a connection with a wireless device for the MBS via a Distributed Unit, DU, of the RAN node based on the information for the MBS; providing, via the DU, the MBS by using a first transmission to the wireless device; receiving, from the DU, an Uplink, UL, Radio Resource Control, RRC, Transfer message including a measurement report for the MBS generated by the wireless device; determining whether to switch the first transmission to a second transmission for the MBS based on the measurement report; transmitting, to the DU, a Transmission Switching Request message including (i) the service identity of the MBS and (ii) a switching indication; receiving, from the DU, a Transmission Switching Response message including (i) the service identity of the MBS and (ii) information informing that allocating radio resources for the second transmission for the MBS is allowable; and providing, via the DU, the MBS by using the second transmission to the wireless device, wherein the first transmission is one of unicast transmission or multicast transmission, and the second transmission is another one of unicast transmission or multicast transmission. receiving, from an Access and Mobility Function, AMF, a Packet Data Unit, PDU, Session Request message including information for a Multicast and/or Broadcast Service, MBS, wherein the information for the MBS includes (i) a service identity of the MBS, (ii) a Tunnel Endpoint Identifier, TEID, for the MBS, and/or (iii) a flow identity of the MBS; transmitting, to a Distributed Unit, DU, a User Equipment, UE, Context Request message including the information for the MBS; establishing a connection with a wireless device for the MBS via a Distributed Unit, DU, of the RAN node based on the information for the MBS; providing, via the DU, the MBS by using a first transmission to the wireless device; receiving, from the DU, an Uplink, UL, Radio Resource Control, RRC, Transfer message including a measurement report for the MBS generated by the wireless device; determining whether to switch the first transmission to a second transmission for the MBS based on the measurement report; transmitting, to the DU, a Transmission Switching Request message including (i) the service identity of the MBS and (ii) a switching indication; receiving, from the DU, a Transmission Switching Response message including (i) the service identity of the MBS and (ii) information informing that allocating radio resources for the second transmission for the MBS is allowable; and providing, via the DU, the MBS by using the second transmission to the wireless device, wherein the first transmission is one of unicast transmission or multicast transmission, and the second transmission is another one of unicast transmission or multicast transmission.