Terminal, method for operating the terminal, and method for interworking in wireless communication system including 3GPP LTE network and 3GPP legacy network

A terminal for use in a wireless communication system including an advanced network and a legacy network, the terminal comprising:

• a transmitter configured to transmit signals to the advanced network and the legacy network;
• a receiver configured to receive signals from the advanced network and the legacy network;
• and
• a controller configured to control the transmitter and the receiver,
• wherein the controller is further configured so as
• to receive, if the terminal is in an active state for the advanced network, a Circuit Switched (CS) paging message through the advanced network;
• and
• to receive, if the terminal is in an idle state, the CS paging message and the data paging message through the legacy network,
• wherein the legacy network comprises a Wideband Code Division Multiple Access (WCDMA) network, and the advanced network comprises a Long Term Evolution (LTE) network.

A method for interworking in a wireless communication system including a terminal, an advanced network and a legacy network, the method comprising:

• registering, by the terminal, with the advanced network and the legacy network which operate in an overlay mode;
• receiving, by the legacy network, one of a Circuit Switched (CS) voice call request from the legacy network and Packet Switched (PS) data for the terminal from the advanced network, when the terminal is in an idle state;
• transmitting to the terminal, by the legacy network, a CS paging message if the CS voice call request is received and a data paging message if the PS data is received;
• receiving, by the terminal, one of the CS paging message and the data paging message through the legacy network, when the terminal is in the idle state;
• and
• receiving, by the terminal, the CS paging message through the advanced network, when the terminal is in an active state for the advanced network,
• wherein the legacy network comprises a Wideband Code Division Multiple Access (WCDMA) network and the advanced network comprises a Long Term Evolution (LTE) network.