Method for adjusting size of contention window in wireless communication system, and communication device using method

A base station (BS) comprising:

• a transceiver;
• and
• a processor operatively coupled with the transceiver, wherein the processor is configured to:
• transmit at least one code block group (CBG) for a physical downlink shared channel (PDSCH) to a user equipment (UE) on a frequency bandwidth;
• receive an acknowledgement/negative-acknowledgement (ACK/NACK) signal for each of the at least one CBG for the PDSCH from the UE;
• and
• adjust a size of a contention window based on the ACK/NACK signal,
• wherein based on a first CBG included in the at least one CBG being fully included in a specific frequency band among a plurality of frequency bands, the BS adjusts the size of the contention window for the specific frequency band based on the ACK/NACK signal for the first CBG,
• wherein based on a second CBG included in the at least one CBG overlapping with the plurality of frequency bands, the BS adjusts the size of the contention window for each of the plurality of frequency bands based on the ACK/NACK signal for the second CBG, and
• wherein each of the plurality of frequency bands is a unit for adjusting the size of the contention window.

A non-transitory computer readable memory storing instructions that, based on being executed by a processor, control a base station (BS) to perform operations for adjusting a size of a contention window in a wireless communication system, the operations comprising:

• transmitting at least one code block group (CBG) for a physical downlink shared channel (PDSCH) to a user equipment (UE) on a frequency bandwidth;
• receiving an acknowledgement/negative-acknowledgement (ACK/NACK) signal for each of the at least one CBG for the PDSCH from the UE;
• and
• adjusting the size of the contention window based on the ACK/NACK signal,
• wherein based on a first CBG included in the at least one CBG being fully included in a specific frequency band among a plurality of frequency bands, the BS adjusts the size of the contention window for the specific frequency band based on the ACK/NACK signal for the first CBG,
• wherein based on a second CBG included in the at least one CBG overlapping with the plurality of frequency bands, the BS adjusts the size of the contention window for each of the plurality of frequency bands based on the ACK/NACK signal for the second CBG, and
• wherein each of the plurality of frequency bands is a unit for adjusting the size of the contention window.