Method for channel access in wireless communication system and apparatus for performing same

A user equipment performing channel access on an unlicensed band, the user equipment comprising:

• a processor to sense a carrier of an unlicensed band for transmitting an uplink signal;
• and
• a transmitter to transmit the uplink signal when power detected by sensing the carrier is less than an energy detection threshold that is configured by the user equipment,
• wherein the energy detection threshold is configured to be equal to or less than a maximum energy detection threshold determined by the user equipment,
• wherein the maximum energy detection threshold is determined adaptively a bandwidth of the carrier using a decibel value of a ratio between a reference bandwidth and the bandwidth of the carrier,
• wherein the maximum energy detection threshold is configured to be equal to or greater than a first power value which is a sum of a lower bound of the maximum energy detection threshold for the reference bandwidth and the decibel value, and
• wherein the first power value is obtained by a first equation ‘−72+10*log 10(BWMHz/20 MHz) [dBm]’, where ‘20 MHz’ of the first equation corresponds to the reference bandwidth, ‘BWMHz’ corresponds to the bandwidth of the carrier represented in a unit of MHz, ‘10*log 10(BWMHz/20 MHz)’ corresponds to the decibel value, and ‘−72’ corresponds to the lower bound of the maximum energy detection threshold for the reference bandwidth represented in a unit of dBm.

A method of performing channel access on an unlicensed band by a base station in a wireless communication system, the method comprising:

• receiving an uplink signal when power detected by sensing a carrier is less than an energy detection threshold that is configured by a user equipment,
• wherein the energy detection threshold is configured to be equal to or less than a maximum energy detection threshold determined by the user equipment,
• wherein the maximum energy detection threshold is determined adaptively to a bandwidth of the carrier using a decibel value of a ratio between a reference bandwidth and the bandwidth of the carrier,
• wherein the maximum energy detection threshold is configured to be equal to or greater than a first power value which is a sum of a lower bound of the maximum energy detection threshold for the reference bandwidth and the decibel value, and
• wherein the first power value is obtained by a first equation ‘−72+10*log 10(BWMHz/20 MHz) [dBm]’, where ‘20 MHz’ of the first equation corresponds to the reference bandwidth, ‘BWMHz’ corresponds to the bandwidth of the carrier represented in a unit of MHz, ‘10*log 10(BWMHz/20 MHz)’ corresponds to the decibel value, and ‘−72’ corresponds to the lower bound of the maximum energy detection threshold for the reference bandwidth represented in a unit of dBm.

An apparatus for a user equipment, the apparatus comprising:

• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• sensing a carrier of an unlicensed band for transmitting an uplink signal;
• and
• transmitting the uplink signal when power detected by sensing the carrier is less than an energy detection threshold that is configured by the user equipment,
• wherein the energy detection threshold is configured to be equal to or less than a maximum energy detection threshold determined by the user equipment,
• wherein the maximum energy detection threshold is determined adaptively to a bandwidth of the carrier using a decibel value of a ratio between a reference bandwidth and the bandwidth of the carrier,
• wherein the maximum energy detection threshold is configured to be equal to or greater than a first power value which is a sum of a lower bound of the maximum energy detection threshold for the reference bandwidth and the decibel value, and
• wherein the first power value is obtained by a first equation ‘−72+10*log 10(BWMHz/20 MHz) [dBm]’, where ‘20 MHz’ of the first equation corresponds to the reference bandwidth, ‘BWMHz’ corresponds to the bandwidth of the carrier represented in a unit of MHz, ‘10*log 10(BWMHz/20 MHz)’ corresponds to the decibel value, and ‘−72’ corresponds to the lower bound of the maximum energy detection threshold for the reference bandwidth represented in a unit of dBm.