Patent ID: 11895698
Assignee: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A user equipment of a wireless communication system, the user equipment comprising:
a communication module; and
a processor configured to control the communication module,
wherein the processor is configured to:
receive a DRS and non-unicast data which are multiplexed from a base station of the wireless communication system, wherein a channel access type used for a transmission of the DRS and non-unicast data which are multiplexed is selected among two channel access types according to whether both of two conditions are satisfied,
wherein the two conditions include a first condition that a duration of the transmission of the DRS and non-unicast data which are multiplexed is 1 ms or shorter, and a second condition that a duty cycle of DRS transmission is 1/20 or less,
wherein the two channel access types include a first type and a second type, the first type is a channel access in which a random backoff is performed using a variable-size contention window (CW), and a size of the CW is determined according to a channel access priority class, and the second type is a channel access in which only LBT based on a single time interval is performed,
when the first type is used for the transmission of the DRS and non-unicast data which are multiplexed and the transmission is associated with a hybrid automatic repeat request (HARQ)-ACK feedback corresponding to the transmission, the size of the CW is determined based on the HARQ-ACK feedback, and
when the first type is used for the transmission of the DRS and non-unicast data which are multiplexed and the transmission is not associated with HARQ-ACK feedback corresponding to the transmission, the size of the CW is a smallest value among CW size values allowed for the channel access priority class determining the size of the CW.