A method of transmitting an uplink signal by a user equipment, UE, to a base station in a wireless communication system supporting an unlicensed band, the method comprising: receiving from the base station, information indicating an equation of calculating an energy detection threshold for an uplink transmission in the unlicensed band, wherein the information indicates one of: - a first equation for a case where the unlicensed band is not shared with a different communication technology, - a second equation for a case where the unlicensed band is shared with the different communication technology; determining an actual energy detection threshold value for the uplink transmission using the first equation or second equation based on the information; and transmitting the uplink siqnal based on a listen before talk, LBT, procedure for the uplink transmission in the unlicensed band, based on the determined actual energy detection threshold value, wherein the first equation corresponds to the following equation, X Thresh _ max = min T max + 10 dB , X r where X Thresh_max denotes the first maximum energy detection threshold value, T max denotes the reference energy detection threshold value related to the bandwidth, X r denotes the maximum energy detection threshold defined by regulatory requirements, and wherein the second equation corresponds to the following equation, X Thresh _ max = max − 72 dBm 20 MHz , min T max . T max − T A + P H − P TX where X Thresh_max denotes the second maximum energy detection threshold value, T max denotes the reference energy detection threshold value related to the bandwidth, TA denotes a weight for an energy detection threshold value according to a physical channel, PH denotes a reference power value for the base station on the unlicensed band, and PTX corresponds to the configured maximum UE output power for the unlicensed band. receiving from the base station, information indicating an equation of calculating an energy detection threshold for an uplink transmission in the unlicensed band, wherein the information indicates one of: - a first equation for a case where the unlicensed band is not shared with a different communication technology, - a second equation for a case where the unlicensed band is shared with the different communication technology; - a first equation for a case where the unlicensed band is not shared with a different communication technology, - a second equation for a case where the unlicensed band is shared with the different communication technology; determining an actual energy detection threshold value for the uplink transmission using the first equation or second equation based on the information; and transmitting the uplink siqnal based on a listen before talk, LBT, procedure for the uplink transmission in the unlicensed band, based on the determined actual energy detection threshold value, wherein the first equation corresponds to the following equation, X Thresh _ max = min T max + 10 dB , X r where X Thresh_max denotes the first maximum energy detection threshold value, T max denotes the reference energy detection threshold value related to the bandwidth, X r denotes the maximum energy detection threshold defined by regulatory requirements, and wherein the second equation corresponds to the following equation, X Thresh _ max = max − 72 dBm 20 MHz , min T max . T max − T A + P H − P TX where X Thresh_max denotes the second maximum energy detection threshold value, T max denotes the reference energy detection threshold value related to the bandwidth, TA denotes a weight for an energy detection threshold value according to a physical channel, PH denotes a reference power value for the base station on the unlicensed band, and PTX corresponds to the configured maximum UE output power for the unlicensed band. <EOS>