Method for transmitting channel measurement information in wireless communication system and device therefor

A user equipment in a wireless communication system supporting a carrier aggregation, the user equipment comprising:

• a first communication module configured to transmit and receive a signal to and from a first communication system;
• at least one second communication module configured to transmit and receive a signal to and from another communication system;
• and
• a processor,
• wherein the first communication module is further configured to:
• receive a message indicating an operation start of the at least one second communication module coexisting in the user equipment from the at least one second communication module,
• determine an unusable frequency due to in-device coexistence (IDC) interference on the basis of information on an operating frequency of the first communication module and an operating frequency of the at least one second communication module, and
• transmit an IDC interference indication message including channel measurement information corresponding to the determined unusable frequency to the base station, and
• wherein, if the determined unusable frequency is a secondary frequency and a primary frequency is usable, the channel measurement information includes information only on the determined unusable frequency.