IP Library › Granted Patent US 12,562,853
Granted Patent B2
US 12,562,853 · App. 18/402,753 · Granted Feb 24, 2026

Method, device, and system for channel access in unlicensed band

Inventors: Minseok Noh (Gyeonggi-do, KR); Kyungjun Choi (Gyeonggi-do, KR); Jinsam Kwak (Gyeonggi-do, KR)
Assignee: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC.
H04L1/1861H04L1/1812H04W72/0446H04W74/08
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 12,562,853
App. No.
18/402,753
Granted
Feb 24, 2026
Kind
B2
Abstract

Disclosed are a wireless communication device of a wireless communication system and a wireless communication method using same. More specifically, disclosed are a wireless communication device and a wireless communication method using same, wherein the wireless communication device determines a contention window size on the basis of HARQ-ACK values determined according to HARQ-ACK information bits for each transmission block of HARQ-ACK feedback, performs a backoff on the basis of the selected backoff counter value within the contention window size, and determines one HARQ-ACK value on the basis of N bits of HARQ-ACK information of a CBG-based HARQ-ACK bit sequence.

Claims (40)

1 . A terminal for performing downlink reception, the terminal comprising:

a communication module; and

a processor configured to control the communication module, wherein the processor is configured to:

receive a physical downlink shared channel (PDSCH) in a reference duration from a base station, and

transmit a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback in response to the PDSCH,

wherein a contention window (CW) is adjusted based on one or more HARQ-AC K feedbacks transmitted in response to the PDSCH after the PDSCH is received,

wherein the PDSCH is based on a Transport Block (TB) or a Code Block Group (CBG),

wherein the one or more HARQ-ACK feedbacks include at least one of a CBG-based HARQ-ACK feedback for the PDSCH based on the CBG or a TB-based HARQ-ACK feedback for the PDSCH based on the TB,

wherein the reference duration indicates a duration until the end of a first slot in which a PDSCH capable of transmitting a HARQ-ACK feedback is transmitted,

wherein a size of the contention window is increased or reset to a minimum value according to whether one of a first condition for the TB-based HARQ-ACK feedback and a second condition for the CBG-based HARQ-ACK feedback is satisfied,

wherein the first condition is whether a number of bits indicating ACK in the TB-based HARQ-ACK feedback is one or more, and

wherein the second condition is whether a ratio of bits indicating ACK in the CB G-based HARQ-ACK feedback is equal to or greater than a specific ratio.

2 . The terminal of the claim 1 ,

wherein each bit of the TB-based HARQ-ACK feedback corresponds to each TB, and

wherein N bits of the CBG-based HARQ-ACK feedback correspond to CBGs included in a TB.

3 . The terminal of claim 2 ,

wherein the ‘N’ is a maximum number of CBGs constituting a TB.

4 . The terminal of claim 1 ,

wherein the size of the contention window is reset to the minimum value for ever y priority class when at least one of the first condition or the second condition is satisfied.

5 . The terminal of claim 1 ,

wherein the size of the contention window is increased to a next allowed value when both of the first condition and the second condition are not satisfied.

6 . A wireless communication method of a terminal for performing downlink reception, the method comprising:

receiving a physical downlink shared channel (PDSCH) in a reference duration from a base station; and

transmitting a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback in response to the PDSCH,

wherein a contention window (CW) is adjusted based on one or more HARQ-ACK feedbacks transmitted in response to the PDSCH after the PDSCH is received,

wherein the PDSCH is based on a Transport Block (TB) or a Code Block Group (CBG),

wherein the one or more HARQ-ACK feedbacks include at least one of a CBG-based HARQ-ACK feedback for the PDSCH based on the CBG or a TB-based HARQ-ACK feedback for the PDSCH based on the TB,

wherein the reference duration indicates a duration until the end of a first slot in which a PDSCH capable of transmitting a HARQ-ACK feedback is transmitted,

wherein a size of the contention window is increased or reset to a minimum value according to whether one of a first condition for the TB-based HARQ-ACK feedback and a second condition for the CBG-based HARQ-ACK feedback is satisfied,

wherein the first condition is whether a number of bits indicating ACK in the TB-based HARQ-ACK feedback is one or more, and

wherein the second condition is whether a ratio of bits indicating ACK in the CBG-based HARQ-ACK feedback is equal to or greater than a specific ratio.

7 . The method of the claim 6 ,

wherein each bit of the TB-based HARQ-ACK feedback corresponds to each TB, and

wherein N bits of the CBG-based HARQ-ACK feedback correspond to CBGs included in a TB.

8 . The method of claim 7 ,

wherein the ‘N’ is a maximum number of CBGs constituting a TB.

9 . The method of claim 6 ,

wherein the size of the contention window is reset to the minimum value for every priority class when at least one of the first condition or the second condition is satisfied.

10 . The method of claim 6 ,

wherein the size of the contention window is increased to a next allowed value when both of the first condition and the second condition are not satisfied.

Priority Claims (2)
KR 10-2018-0094082 · Aug 10, 2018 · national
KR 10-2018-0114157 · Sep 21, 2018 · national
Continuity (2)
Continuation 17264818
Related Publication 20240154732A1 · May 9, 2024
References Cited (78)
US 10548169B2 · Yang · 2020 [cited by examiner]
US 11159278B2 · Xue et al. · 2021 [cited by applicant]
US 11212825B2 · Gong · 2021 [cited by examiner]
US 20170048718A1 · Kim et al. · 2017 [cited by applicant]
US 20180084432A1 · Kwak et al. · 2018 [cited by applicant]
US 20180242357A1 · Khirallah · 2018 [cited by examiner]
US 20180302927A1 · Noh et al. · 2018 [cited by applicant]
US 20180332478A1 · Noh et al. · 2018 [cited by applicant]
US 20190007972A1 · Gou et al. · 2019 [cited by applicant]
US 20190053265A1 · Kim et al. · 2019 [cited by applicant]
US 20190074937A1 · Bhattad et al. · 2019 [cited by applicant]
US 20190074952A1 · Bhattad et al. · 2019 [cited by applicant]
US 20190098605A1 · Seo · 2019 [cited by examiner]
US 20190098612A1 · Babaei et al. · 2019 [cited by applicant]
US 20190159243A1 · Tao et al. · 2019 [cited by applicant]
US 20190182730A1 · Yeh et al. · 2019 [cited by applicant]
US 20190182870A1 · Shih et al. · 2019 [cited by applicant]
US 20200100284A1 · Li · 2020 [cited by examiner]
US 20200106554A1 · Chendamarai Kannan et al. · 2020 [cited by applicant]
US 20200236709A1 · Park · 2020 [cited by examiner]
US 20200259621A1 · Oh · 2020 [cited by examiner]
US 20200344819A1 · Myung et al. · 2020 [cited by applicant]
US 20200359336A1 · Dinan · 2020 [cited by examiner]
US 20200374236A1 · Li et al. · 2020 [cited by applicant]
US 20200374933A1 · Lou et al. · 2020 [cited by applicant]
US 20200374940A1 · Jia et al. · 2020 [cited by applicant]
US 20200389873A1 · Liu et al. · 2020 [cited by applicant]
US 20210136695A1 · Liu et al. · 2021 [cited by applicant]
US 20210282182A1 · Nogami · 2021 [cited by examiner]
US 20210297193A1 · Noh et al. · 2021 [cited by applicant]
US 20210298075A1 · Talarico · 2021 [cited by examiner]
US 20210344448A1 · Nogami · 2021 [cited by examiner]
US 20220053521A1 · Yoshioka · 2022 [cited by examiner]
US 20220116152A1 · Iyer et al. · 2022 [cited by applicant]
US 20230026357A1 · Lei · 2023 [cited by examiner]
KR 1020170020699 · 2017 [cited by applicant]
KR 1020180063159 · 2018 [cited by applicant]
KR 1020190097296 · 2019 [cited by applicant]
KR 1020200029589 · 2020 [cited by applicant]
WO 2018128474 · 2018 [cited by applicant]
WO 2019031830 · 2019 [cited by applicant]
WO 2020033505 · 2020 [cited by applicant]
R1-230xxxx : Correction ON the HARQ-ACK Mapping For CBG (Year: 2023). [cited by examiner]
R1-2301918 : FLS 2 HARQ-ACK related issues (Year: 2023). [cited by examiner]
Office Action dated Jul. 18, 2024 for Chinese Patent Application No. 201980053256.X and its English translation provided by Applicant's foreign counsel. [cited by applicant]
Notice of Allowance dated Aug. 30, 2024 for U.S. Appl. No. 17/264,818. [cited by applicant]
Notice of Allowance dated Mar. 1, 2024 for U.S. Appl. No. 17/264,818 (now published as U.S. 2021/0297193). [cited by applicant]
International Search Report for PCT/KR2019/010243 mailed on Nov. 26, 2019 and its English translation from WIPO (now published as WO 2020/032783). [cited by applicant]
Written Opinion of the International Searching Authority for PCT/KR2019/010243 mailed on Nov. 26, 2019 and its English translation by Google Translate (now published as WO 2020/032783). [cited by applicant]
Wu, Jianming: “Multilevel Code-block Group based HARQ-ACK Control Channel Design”. 2018 Workshop on Computing, Networking and Communication (CMC), pp. 264-268, Mar. 8, 2018, [retrieved on Oct. 17, 2019], Retrieved from … [cited by applicant]
Samsung: “HARQ enhancements for NR-U”. R1-1806763, 3GPP TSG RAN WG1 Meeting #93, Busan, Korea. May 11, 2018, [retrieved on Oct. 18, 2019]. Retrieved from [https://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_93/Docs/]. See se… [cited by applicant]
Wilus: “Discussion on UL HARQ-ACK feedback for CBG-based retransmission”. R1-1714395, 3GPP TSG RAN WG1 Meeting #90. Prague, Czech Republic, Aug. 12, 2017. [retrieved on Oct. 17, 2019], Retrieved from [https://3gpp.org/f… [cited by applicant]
Notice of Allowance dated Nov. 30, 2023 for Korean Patent Application No. 10-2021-7002480 and its English translation provided by the Applicant's foreign counsel. [cited by applicant]
Office Action dated Nov. 10, 2023 for Chinese Patent Application No. 201980053256.X and its English translation provided by the Applicant's foreign counsel. [cited by applicant]
Notice of Allowance dated Aug. 24, 2023 for Korean Patent Application No. 10-2021-7002480 and its English translation provided by the Applicant's foreign counsel. [cited by applicant]
Apple Inc.: “Discussion on CBG based retransmissions”, 3GPP TSG RAN WG1 Meeting #92bis, R1-1804771, Sanya, China, Apr. 16-20, 2018, pp. 1-5. [cited by applicant]
Nokia, Nokia Shanghai Bell: “HARQ enhancements for NR unlicensed”, 3GPP TSG RAN WG1 Meeting #93, R1-1806110, Busan, Korea, May 21-25, 2018, pp. 1-3. [cited by applicant]
Ericsson: “HARQ enhancements for NR-U”, 3GPP TSG-RAN WG1 Meeting #93, R1-1806255, Busan, Korea, May 21-25, 2018, pp. 1-5. [cited by applicant]
CATT: “HARQ Operations in NR-U”, 3GPP TSG RAN WGI Meeting #93, R1-1806319, Busan, Korea, May 21-25, 2018, pp. 1-3. [cited by applicant]
ZTE: “Discussion on scheduling and HARQ for NR-U”, 3GPP TSG RAN WG1 Meeting #93, R1-1806464, Busan, Korea, May 21-25, 2018, pp. 1-3. [cited by applicant]
Intel Corporation: “Potential enhancements to NR scheduling and HARQ to support unlicensed operation”, 3GPP TSG RAN WG1 Meeting #93, R1-1806546, Busan, Korea, May 21-25, 2018, pp. 1-3. [cited by applicant]
LG Electronics: “HARQ Operations for NR unlicensed operation”, 3GPP TSG RAN WG1 Meeting #93, R1-1806647, Busan, Korea, May 21-25, 2018, pp. 1-3. [cited by applicant]
LG Electronics: “Discussion on configured grant for NR unlicensed operation”, 3GPP TSG RAN WG1 Meeting #93, R1-1806648, Busan, Korea, May 21-25, 2018, pp. 1-4. [cited by applicant]
NEC: “Discussion on HARQ enhancements for NR-U”, 3GPP TSG RAN WG1 Meeting #93, R1-1806671, Busan, Korea, May 21-25, 2018, pp. 1-3. [cited by applicant]
InterDigital Inc.: “Discussion on HARQ Procedure in NR-Unlicensed”, 3GPP TSG RAN WG1 Meeting #93, R1-1807038, Busan, Korea, May 21-25, 2018, pp. 1-3. [cited by applicant]
Ericsson: “Remaining issues for CBG based Harq”, 3GPP TSG-RAN WG1 Meeting #93, R1-1807257, Busan, Korea, May 21-25, 2018, pp. 1-3. [cited by applicant]
Qualcomm Incorporated: “Enhancements to Scheduling and HARQ operation for NR-U”, 3GPP TSG RAN WG1 Meeting #93, R1-1807391, Busan, Korea, May 21-25, 2018, pp. 1-7. [cited by applicant]
Qualcomm Incorporated: “Summary of offline discussion on NR-U”, 3GPP TSG RAN WG1 Meeting #93, R1-1807728, Busan, Korea, May 21-25, 2018, pp. 1-12. [cited by applicant]
Samsung: “TP to include total DAI in TS38.213 for determining missed TBs/CBGs”, 3GPP TSG RAN WG1 #93, R1-1807879, Busan, Korea, May 21-25, 2018, pp. 1-3. [cited by applicant]
MCC Support: “Final Report of 3GPP TSG RAN WG1 #93 v1.0.0 (Busan, South Korea, May 21-25, 2018)”, 3GPP TSG RAN WG1 Meeting #94, R1-1808001, Gothenburg, Sweden, Aug. 20-24, 2018, pp. 1-198. [cited by applicant]
TCL Communication: “Discussion on partial slot transmission in NR-U”, 3GPP TSG RAN WG1 Meeting 94, R1-1808254, Gothenburg, Sweden, Aug. 20-24, 2018, pp. 1-7. [cited by applicant]
Office Action dated Apr. 19, 2022 for Indian Patent Application No. 202127006413. [cited by applicant]
International Preliminary Report on Patentability (Chapter I) for PCT/KR2019/010243 issued on Feb. 16, 2021 and its English translation from WIPO (now published as WO2020/032783). [cited by applicant]
Office Action dated Apr. 11, 2023 for Korean Patent Application No. 10-2021-7002480 and its English translation provided by the Applicant's foreign counsel. [cited by applicant]
LG Electronics: “Channel access procedure for NR unlicensed operation”, 3GPP TSG RAN WG1 Meeting #93, R1-1806645, Busan, Korea, May 21-25, 2018, pp. 1-6. [cited by applicant]
Notice of Allowance dated Sep. 11, 2023 for U.S. Appl. No. 17/264,818 (now published as U.S. 2021/0297193). [cited by applicant]
Office Action dated Apr. 27, 2024 for Chinese Patent Application No. 201980053256.X and its English translation provided by Applicant's foreign counsel. [cited by applicant]
Office Action (1st) dated Dec. 2, 2025 for Korean Patent Application No. 10-2023-7040698 and its English translation provided by Applicant's foreign counsel. [cited by applicant]