Method and device for performing wireless communication in unlicensed band

1 . A method for performing wireless communication by a user equipment (UE) in an unlicensed band, the method comprising:

receiving information for allocating a radio resource in a system band made up of a plurality of subbands;

acquiring availability information based on performing a Listen Before Talk (LBT) on at least one of subbands in a bandwidth part (BWP) included in the radio resource; and

transmitting uplink control information including the availability information,

wherein one of multiple LBT schemes, including a no LBT scheme, a LBM scheme without a random backoff, a fixed backoff LBT scheme, or a variable random backoff LBT scheme, is determined based on a timing gap between a downlink transmission and a uplink transmission in channel occupancy time (COT) of the base station,

wherein the BWP is switched to another BWP among a plurality of BWPs allocated to the UE when the availability information indicates that a state of the at least one of subbands deteriorates beyond a threshold value, and

wherein the availability information is determined based on a number of successes and a number of failures in the LBT for each subband.

2 . The method of claim 1 , further comprising: receiving downlink control information comprising information on a plurality of radio resources allocated for transmission and reception of predetermined data based on the availability information.

3 . The method of claim 1 , further comprising: receiving downlink control information comprising information indicating a selected subband among subbands included in the radio resource based on the availability information.

4 . A method for performing wireless communication by a base station in an unlicensed band, the method comprising:

transmitting information for allocating a radio resource in a system band made up of a plurality of subbands; and

receiving uplink control information including availability information based on performing a Listen Before Talk (LBT) on at least one of subbands in a bandwidth part (BWP) included in the radio resource,

wherein one of multiple LBT schemes, including a no LBT scheme, a LBM scheme without a random backoff, a fixed backoff LBT scheme, or a variable random backoff LBT scheme, is determined based on a timing gap between a downlink transmission and a uplink transmission in channel occupancy time (COT) of the base station,

wherein the BWP is switched to another BWP among a plurality of BWPs allocated to the UE when the availability information indicates that a state of the at least one of subbands deteriorates beyond a threshold value, and

wherein the availability information is determined based on a number of successes and a number of failures in the LBT for each subband.

5 . The method of claim 4 , further comprising: transmitting downlink control information including information on a plurality of radio resources allocated for transmission and reception of predetermined data based on the availability information.

6 . The method of claim 4 , further comprising: transmitting downlink control information including information indicating a selected subband among subbands included in the radio resource based on the availability information.

7 . A user equipment (UE) for performing wireless communication in an unlicensed band, the UE comprising:

a receiver configured to receive information for allocating a radio resource in a system band made up of a plurality of subbands;

a controller configured to acquire availability information based on performing a Listen Before Talk (LBT) on at least one of subbands in a bandwidth part (BWP) included in the radio resource; and

a transmitter configured to transmit uplink control information including the availability information,

wherein one of multiple LBT schemes, including a no LBT scheme, a LBM scheme without a random backoff, a fixed backoff LBT scheme, or a variable random backoff LBT scheme, is determined based on a timing gap between a downlink transmission and a uplink transmission in channel occupancy time (COT) of the base station,

wherein the BWP is switched to another BWP among a plurality of BWPs allocated to the UE when the availability information indicates that a state of the at least one of subbands deteriorates beyond a threshold value, and

wherein the availability information is determined based on a number of successes and a number of failures in the LBT for each subband.

8 . The UE of claim 7 , wherein the receiver receives downlink control information including information on a plurality of radio resources allocated for transmission and reception of predetermined data based on the availability information.

9 . The UE of claim 7 , wherein the receiver receives downlink control information including information indicating a selected subband among at least one of subbands included in the radio resource based on the availability information.