Method and device for performing handover in wireless communication system

A device of a network node in a wireless communication system, the device comprising:

• at least one transceiver;
• and
• at least one processor operably coupled with the at least one transceiver,
• wherein the at least one processor is configured to:
• control the at least one transceiver to receive a message for requesting configuration information from a terminal connected to the network node, and
• control the at least one transceiver to transmit the configuration information including at least one parameters for a handover between a first radio access technology (RAT) for the network node and a second RAT for another network node,
• wherein the first RAT provides a wireless local area network (WLAN),
• wherein the second RAT provides a cellular network,
• wherein the configuration information is transmitted with a quality of service class identifier (QCI) of a same quality of service (QoS) as a QoS on a bearer configured in the terminal, and
• wherein the at least one parameter comprises a time unit parameter for measuring a first quality for a first signal of the first RAT and a second quality for a second signal of the second RAT.

A terminal in a wireless communication system, the terminal comprising:

• at least one transceiver;
• and
• at least one processor operably coupled with the at least one transceiver,
• wherein the at least one processor is configured to:
• control the at least one transceiver to receive configuration information from a first network node for a first radio access technology (RAT),
• measure a first quality for a first signal of the first RAT and a second quality for a second signal of a second RAT, based on the received configuration information, and
• determine whether to perform a handover to a second network node for the second RAT or not, based on at least one of the first quality or the second quality, and
• wherein the configuration information includes at least one parameter for a handover between the first RAT and the second RAT,
• wherein the configuration information is received with a quality of service class identifier (QCI) of a same quality of service (QoS) as a QoS on a bearer configured in the terminal, and
• wherein the at least one parameter comprises a time unit parameter for measuring the first quality and the second quality.