Method and device for providing service in wireless communication system

A method for a first network core to provide a service, the method comprising:

• receiving a traffic indicator indicating that there is second network priority traffic from a second network core;
• transmitting information indicating second network priority traffic to a terminal;
• and
• receiving a service request or information indicating that the terminal has transmitted a service request to the second network according to a cell search result of the terminal,
• wherein the second network priority traffic is second network dedicated traffic or traffic whose transmission through the second network takes priority over transmission through the first network.

A method for a second network core to provide a service, the method comprising:

• determining whether traffic destined for a terminal is second network priority traffic;
• transmitting a traffic indicator indicating that the traffic destined for the terminal is the second network priority traffic to a first network core, in case that the traffic destined for the terminal is the second network priority traffic;
• and
• receiving a service request from the terminal through the second network,
• wherein the second network priority traffic is second network dedicated traffic or traffic whose transmission through the second network takes priority over transmission through the first network.

A terminal comprising:

• a transceiver configured to transmit and receive signals;
• and
• a controller configured to control receiving information indicating second network priority traffic from a first network core, searching for a cell of a second network based on the information indicating second network priority traffic, and transmitting a service request to the second network, in case that there is a cell connectable to the second network,
• wherein the second network priority traffic is second network dedicated traffic or traffic whose transmission through the second network takes priority over transmission through the first network.

A first network core comprising:

• a transceiver configured to transmit and receive signals;
• and
• a controller configured to control receiving a traffic indicator indicating that there is second network priority traffic from a second network core, transmitting information indicating second network priority traffic to a terminal, and receiving a service request or information indicating that the terminal has transmitted a service request to the second network according to a cell search result of the terminal,
• wherein the second network priority traffic is second network dedicated traffic or traffic whose transmission through the second network takes priority over transmission through the first network.

A second network core comprising:

• a transceiver configured to transmit and receive signals;
• and
• a controller configured to control determining whether traffic destined for a terminal is second network priority traffic, transmitting a traffic indicator indicating that the traffic destined for the terminal is the second network priority traffic to a first network core, in case that the traffic destined for the terminal is the second network priority traffic, and receiving a service request from the terminal through the second network,
• wherein the second network priority traffic is second network dedicated traffic or traffic whose transmission through the second network takes priority over transmission through the first network.