Method and device for receiving service through different wireless communication systems

A method by a base station of a first wireless communication system for providing a service to a terminal, the method comprising:

• transmitting, to the terminal, a configuration message for configuring a secondary cell in an unlicensed band;
• when a request for use of a second wireless communication system using the unlicensed band is identified and the terminal is detached from a network, transmitting a user equipment (UE) capability information request message after the terminal is attached to the base station;
• and
• receiving UE capability information including information that indicates the terminal does not support a licensed assisted access (LAA).

A terminal for receiving a service through different wireless communication systems, the terminal comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• receive, from a base station of a first wireless communication system, a configuration message for configuring a secondary cell in an unlicensed band,
• identify a request for use of a second wireless communication system using the unlicensed band,
• transmit, to a mobility management entity (MME), a detach request message for detaching the terminal from a network, and
• report user equipment (UE) capability information including information that indicates the terminal does not support a licensed assisted access (LAA) after attaching to the base station.

A base station of a first wireless communication system for providing a service to a terminal, the base station comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• transmit, to the terminal, a configuration message for configuring a secondary cell in an unlicensed band,
• when a request for use of a second wireless communication system using the unlicensed band is identified and the terminal is detached from a network,
• transmit a user equipment (UE) capability information request message after the terminal is attached to the base station, and
• receive UE capability information including information that indicates the terminal does not support a licensed assisted access (LAA).