1. A method for operating a user equipment in a wireless communication system, the method comprising:receiving, from a base station, an uplink grant that schedules an uplink transmission to the base station in at least one subframe through an unlicensed cell;
determining a channel access type for performing the uplink transmission among a first type channel access and a second type channel access according to a predetermined interval determined based on a downlink transmission through the unlicensed cell from the base station, wherein the first type channel access is based on a channel sensing with a random backoff before data transmission, wherein the second type channel access is based on a channel sensing with a single interval before data transmission; and
performing the uplink transmission in the at least one subframe using the determined channel access type,
wherein the uplink transmission is performed using the second type channel access when all of the uplink transmission in the at least one subframe is included in the predetermined interval.