A method performed by a user equipment (UE) in a wireless communication system is provided. The method comprises receiving configuration information on a multicast broadcast service (MBS), and receiving, based on the configuration information, MBS data in a radio resource control (RRC)_Connected mode. The MBS data is transmitted to plurality of UEs including the UE for multicast transmission, or to the UE for unicast transmission. A Hybrid Automatic Repeat and request (HARQ) retransmission is applied to a transmission of the MBS data.