Method and apparatus for transmitting and receiving data in wireless communication system

A method of transmitting and receiving data by a user equipment (UE) in a wireless communication system, the method comprising:

• transmitting traffic to a base station (BS) via a unicast scheme;
• as a transmission scheme is switched from the unicast scheme to a broadcast/multicast scheme based on information about a number of UEs connected to the BS so as to use a particular application, a particular service, or a particular session, or information of traffic to be used by the UE, receiving a message informing that the transmission scheme of the traffic is to be switched based on an event subscription message requesting the information about the number of UEs using the particular application, the particular service, or the particular session or the traffic to be used by the UE;
• as the message is received, identifying an application, a service, or a session in which the transmission scheme is changed;
• and
• receiving traffic of the identified application, the identified service, or the identified session according to the broadcast/multicast scheme.

A base station (BS) configured to transmit and receive data in a wireless communication system, the BS comprising:

• a transceiver;
• and
• a processor connected to the transceiver,
• wherein the processor is configured to:
• control the transceiver to transmit traffic to at least one user equipment (UE) connected to the BS via a unicast scheme;
• based on information about a number of UEs connected to the BS to use a particular application, a particular service, or a particular session, or information of traffic to be used by the UE, determine whether to switch a transmission scheme of the traffic from the unicast scheme to a broadcast/multicast scheme;
• as the broadcast/multicast scheme is determined as the transmission scheme of the traffic, control the transceiver to transmit a message informing that the transmission scheme of the traffic is to be switched;
• and
• when the number of UEs using the particular application, the particular service, or the particular session or the traffic of the UE exceeds a threshold, control the transceiver to transmit, to a core network device, an event subscription message requesting a notification therefor.