Method and device for transmitting data in unlicensed band

Provided are a method and apparatus for transmitting data in an unlicensed band. The device determines a downlink reception end time and an uplink transmission start time at which the uplink transmission starts in the unlicensed band. If the interval between the downlink reception end time and the uplink transmission start time is equal to or less than a threshold value, the device abandons the uplink transmission.