# US 12,193,007 B2 · Method for terminal to access channel in unlicensed band and device using same method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,193,007 B2 - Document ID: US12193007B2 - Status: Granted - Kind: B2 - Application number: 17/278,254 - Filed: 2019-09-23 - Published: 2021-11-18 - Granted: 2025-01-07 - Earliest claimed: 2018-09-21 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Sechang Myung; Seonwook Kim; Changhwan Park; Joonkui Ahn; Suckchel Yang - Web page: https://patentgrep.com/patent/US12193007B2 ## CPC - H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Provided are a method for accessing a channel in an unlicensed band and a device using same method. The method is configured such that a wireless device transmits data units, receives feedback information about the data units, and adjusts a contention window size used in a determination of whether there is an access to the channel in the unlicensed band on the basis of the feedback information. The wireless device can adjust the contention window size by using feedback information about, from among the data units, data units which at least partially overlap in reference duration. ## Claims ### Claim 1 A method of adjusting a contention window size of a user equipment (UE) in a wireless communication system, the method comprising: transmitting code block groups (CBGs) through a physical uplink shared channel (PUSCH); receiving downlink control information (DCI) including a new data indicator (NDI) and a code block group transmission information (CBGTI) field; and adjusting the contention window size, wherein, based on that the NDI has not been toggled, ACK/NACK information for the CBGs is provided by the CBGTI field indicating at least one CBG to be retransmitted among the CBGs and the contention window size is adjusted based on the ACK/NACK information, wherein, based on that the NDI has been toggled, the contention window size is set to a minimum contention window size for a priority class, wherein the ACK/NACK information corresponds to the PUSCH in a reference time resource for a channel occupancy, and wherein the reference time resource is a duration of a first transmission burst by the UE within the channel occupancy that contains the PUSCH. ### Claim 2 (depends on 1) The method of claim 1, wherein, in the CBGTI field, NACK is assumed for the at least one CBG. ### Claim 3 (depends on 1) The method of claim 1, wherein the DCI is used for scheduling a physical uplink shared channel (PUSCH). ### Claim 4 (depends on 3) The method of claim 3, wherein the at least one CBG is retransmitted through the PUSCH. ### Claim 5 A user equipment (UE), the UE comprising: at least one transceiver configured to transmit and receive a radio signal; and at least one processor connected to the at least one transceiver, wherein the at least one processor is configured to: transmit code block groups (CBGs) through a physical uplink shared channel (PUSCH), receive downlink control information (DCI) including a new data indicator (NDI) and a code block group transmission information (CBGTI) field, and adjust a contention window size, wherein, based on that the NDI has not been toggled, ACK/NACK information for the CBGs is provided by the CBGTI field indicating at least one CBG to be retransmitted among the CBGs and the contention window size is adjusted based on the ACK/NACK information, wherein, based on that the NDI has been toggled, the contention window size is set to a minimum contention window size for a priority class, wherein the ACK/NACK information corresponds to the PUSCH in a reference time resource for a channel occupancy, and wherein the reference time resource is a duration of a first transmission burst by the UE within the channel occupancy that contains the PUSCH. ### Claim 6 (depends on 5) The UE of claim 5, wherein, in the CBGTI field, NACK is assumed for the at least one CBG. ### Claim 7 (depends on 5) The UE of claim 5, wherein the DCI is used for scheduling a physical uplink shared channel (PUSCH). ### Claim 8 (depends on 7) The UE of claim 7, wherein the at least one CBG is retransmitted through the PUSCH. ### Claim 9 An apparatus, the apparatus comprising: at least one memory storing instructions; and at least one processor connected to the at least one memory, wherein the at least one processor executes the instructions to perform operations comprising: transmitting code block groups (CBGs) through a physical uplink shared channel (PUSCH), receiving downlink control information (DCI) including a new data indicator (NDI) and a code block group transmission information (CBGTI) field, and adjusting a contention window size, wherein, based on that the NDI has not been toggled, ACK/NACK information for the CBGs is provided by the CBGTI field indicating at least one CBG to be retransmitted among the CBGs and the contention window size is adjusted based on the ACK/NACK information, wherein, based on that the NDI has been toggled, the contention window size is set to a minimum contention window size for a priority class, wherein the ACK/NACK information corresponds to the PUSCH in a reference time resource for a channel occupancy, and wherein the reference time resource is a duration of a first transmission burst by the apparatus within the channel occupancy that contains the PUSCH. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein, in the CBGTI field, NACK is assumed for the at least one CBG. ### Claim 11 (depends on 9) The apparatus of claim 9, wherein the DCI is used for scheduling a physical uplink shared channel (PUSCH). ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the at least one CBG is retransmitted through the PUSCH.