IP Library › Granted Patent US 12,225,595
Granted Patent B2
US 12,225,595 · App. 18/381,966 · Granted Feb 11, 2025

Channel access method for performing transmission in unlicensed band, and device using same

Inventors: Minseok Noh (Gyeonggi-do, KR); Kyungjun Choi (Gyeonggi-do, KR); Jinsam Kwak (Gyeonggi-do, KR)
Assignee: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC.
H04W74/085H04W72/1263H04W72/23H04W74/0816H04W74/0866
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Quick Facts
Patent No.
US 12,225,595
App. No.
18/381,966
Granted
Feb 11, 2025
Kind
B2
Abstract

A base station of a wireless communication system is disclosed. The base station of wireless communication includes a communication module and a processor. The processor is configured to receive a grant for scheduling a plurality of uplink transmissions from the base station, and when the UE attempts to a first fixed duration-based channel access for a first transmission which is one of the plurality of uplink transmission and fails in the first fixed duration-based channel access, attempt to a second fixed duration-based channel access for a second transmission which is a transmission following the first transmission.

Claims (23)

1. A user equipment (UE) for use in a wireless communication system, the UE comprising:

a communication module; and

a processor controlling the communication module,

wherein the processor is configured to:

attempt to transmit a transmission using a first channel access procedure, the first channel access procedure including a channel sensing for a time interval of 16 μs before the transmission; and

if the first channel access procedure for the transmission is failed, and the transmission is in a set of contiguous transmissions prior to a last transmission of the set, attempt to transmit a next transmission in the set using a second channel access procedure, the second channel access procedure including a channel sensing for a time interval of 25 μs before the next transmission.

2. The UE of claim 1 , wherein the transmission includes a physical shared channel transmission.

3. The UE of claim 1 , wherein the set of contiguous transmissions is within a channel occupancy time (COT).

4. The UE of claim 1 , wherein the UE attempts to transmit the set of contiguous transmissions in association with one or more grants.

5. The UE of claim 1 , wherein, if the first channel access procedure is succeeded, the transmission is transmitted immediately after the time interval of 16 μs.

6. The UE of claim 1 , wherein, if the second channel access procedure is succeeded, the next transmission is transmitted immediately after the time interval of 25 μs.

7. The UE of claim 1 , wherein the first and second channel access procedures do not include a random-backoff operation.

8. The UE of claim 1 , wherein the wireless communication system includes a 3 rd generation partnership project new radio (3GPP NR)-based wireless communication system supporting unlicensed band operations.

9. A method for use by a user equipment (UE) in a wireless communication system, the method comprising:

attempting to transmit a transmission using a first channel access procedure, the first channel access procedure including a channel sensing for a time interval of 16 μs before the transmission; and

if the first channel access procedure for the transmission is failed, and the transmission is in a set of contiguous transmissions prior to a last transmission of the set, attempting to transmit a next transmission in the set using a second channel access procedure, the second channel access procedure including a channel sensing for a time interval of 25 μs before the next transmission.

10. The method of claim 9 , wherein the transmission includes a physical shared channel transmission.

11. The method of claim 9 , wherein the set of contiguous transmissions is within a channel occupancy time (COT).

12. The method of claim 9 , wherein the UE attempts to transmit the set of contiguous transmissions in association with one or more grants.

13. The method of claim 9 , wherein, if the first channel access procedure is succeeded, the transmission is transmitted immediately after the time interval of 16 μs.

14. The method of claim 9 , wherein, if the second channel access procedure is succeeded, the next transmission is transmitted immediately after the time interval of 25 μs.

15. The method of claim 9 , wherein the first and second channel access procedures do not include a random-backoff operation.

16. The method of claim 9 , wherein the wireless communication system includes a 3 rd generation partnership project new radio (3GPP NR)-based wireless communication system supporting unlicensed band operations.

Priority Claims (1)
KR 10-2019-0095457 · Aug 6, 2019 · national
Continuity (4)
Continuation 17740194 · May 9, 2022
Continuation 17590824 · Feb 2, 2022
Continuation PCTKR2020010409 · Aug 6, 2020
Related Publication 20240049305A1 · Feb 8, 2024
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