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

Claim 0:
1. A base station of a wireless communication system, the base station comprising:
a communication module; and
a processor configured to control the communication module,
wherein the processor is configured to:
select one of two channel access types according to whether both of two conditions are satisfied, when the base station performs transmission of a DRS and non-unicast data which are multiplexed, 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 includes 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 base station performs the transmission of the DRS and non-unicast data which are multiplexed using the first type and the transmission is associated with a hybrid automatic repeat request (HARQ)-ACK feedback corresponding to the transmission, adjust the size of the CW based on the HARQ-ACK feedback and perform the channel access using the first type with the adjusted size of the CW, and
when the base station performs the transmission of the DRS and non-unicast data which are multiplexed using the first type and the transmission is not associated with HARQ-ACK feedback corresponding to the transmission, perform the channel access using the first type with a smallest value among CW size values allowed for the channel access priority class determining the size of the CW.