# US 12,193,053 B2 · Listen before talk signaling and channel occupancy time sharing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,193,053 B2 - Document ID: US12193053B2 - Status: Granted - Kind: B2 - Application number: 17/438,274 - Filed: 2021-08-04 - Published: 2023-08-31 - Granted: 2025-01-07 - Earliest claimed: 2021-08-04 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Huaning Niu; Seyed Ali Akbar Fakoorian; Hong He; Yushu Zhang; Wei Zeng; Dawei Zhang; Weidong Yang; Oghenekome Oteri; Chunxuan Ye; Haitong Sun; Sigen Ye - Web page: https://patentgrep.com/patent/US12193053B2 ## CPC - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 72/232: the control data signalling from the physical layer, e.g. DCI signalling - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract This disclosure relates to techniques for performing wireless communications including channel access procedures for a user equipment (UE) and a base station. Techniques for signaling channel access types, use of channel access, and other channel access parameters are disclosed. ## Claims ### Claim 1 A processor comprising circuitry configured to: establish communication with a base station; exchange, with the base station, configuration information; receive, from the base station, an uplink grant scheduling a first uplink transmission on at least a first part of a first channel; compare a bandwidth of a bandwidth part indicated in the configuration information divided by an integer greater than 1, and a minimum unit bandwidth based on a minimum channel bandwidth, per subcarrier spacing (SCS); determine, based on the configuration information, a listen before talk (LBT) unit bandwidth, wherein the LBT unit bandwidth is the larger of: the bandwidth of the bandwidth part indicated in the configuration information divided by the integer greater than 1, and the minimum unit bandwidth based on the minimum channel bandwidth, per subcarrier spacing (SCS); determine whether a first part of the first channel has a bandwidth within a single unit of the LBT unit bandwidth; perform a LBT procedure, wherein the LBT procedure is performed either: using the LBT unit bandwidth on the first channel in response to a determination that the first part of the first channel has a bandwidth within the single unit of the LBT unit bandwidth; or using a first bandwidth of the first channel in response to a determination that the first part of the first channel has a bandwidth that is not within the single unit of the LBT unit bandwidth; determine that the LBT procedure is successful on at least a first portion of the first channel, wherein the first portion of the first channel has a bandwidth equal to the LBT unit bandwidth; and in response to the determination that the LBT procedure is successful on at least the first portion of the first channel, transmit, to the base station, the first uplink transmission at least in part on the first portion of the first channel. ### Claim 2 (depends on 1) The processor of claim 1, wherein the circuitry is further configured to: determine that the LBT procedure is not successful at least on a second portion of the first channel, wherein the first uplink transmission is not transmitted on the second portion of the first channel, wherein the second portion of the first channel has a bandwidth equal to the LBT unit bandwidth. ### Claim 3 (depends on 1) The processor of claim 1, wherein the circuitry is further configured to: transmit, to the base station an indication of the LBT unit bandwidth, wherein the indication of the LBT unit bandwidth comprises uplink control information and is multiplexed with the first uplink transmission. ### Claim 4 (depends on 1) The processor of claim 1, wherein the first part of the first channel comprises a bandwidth within at least two units of the LBT unit bandwidth, wherein the determination that the LBT procedure is successful on at least the first portion of the first channel comprises a determination that the LBT procedure is successful on each of the at least two units of the LBT unit bandwidth of the first part of the first channel. ### Claim 5 (depends on 1) The processor of claim 1, wherein: the first part of the first channel comprises a bandwidth within at least two units of the LBT unit bandwidth; the first portion of the first channel comprises a first unit of the at least two units of the LBT unit bandwidth; the LBT procedure is not successful on a second unit of the at least two units of the LBT unit bandwidth; and to transmit the first uplink transmission to the base station, the circuitry is configured not to transmit on the second unit of the at least two units of the LBT unit bandwidth in response to the LBT procedure being not successful on the second unit of the at least two units of the LBT unit bandwidth. ### Claim 6 (depends on 1) The processor of claim 1, wherein the LBT unit bandwidth is determined based on cell specific signaling included in the configuration information. ### Claim 7 A method, comprising: communicate with a base station; exchange, with the base station, configuration information; receive, from the base station, an uplink grant scheduling a first uplink transmission on at least a first part of a first channel; compare a bandwidth of a bandwidth part indicated in the configuration information divided by an integer greater than 1, and a minimum unit bandwidth based on a minimum channel bandwidth, per subcarrier spacing (SCS); determine, based on the configuration information, a listen before talk (LBT) unit bandwidth, wherein the LBT unit bandwidth is the larger of: the bandwidth of the bandwidth part indicated in the configuration information divided by the integer greater than 1, and the minimum unit bandwidth based on the minimum channel bandwidth, per subcarrier spacing (SCS); determine whether a first part of the first channel has a bandwidth within a single unit of the LBT unit bandwidth; perform a LBT procedure, wherein the LBT procedure is performed either: using the LBT unit bandwidth on the first channel in response to a determination that the first part of the first channel has a bandwidth within the single unit of the LBT unit bandwidth; or using a first bandwidth of the first channel in response to a determination that the first part of the first channel has a bandwidth that is not within the single unit of the LBT unit bandwidth; determine that the LBT procedure is successful on at least a first portion of the first channel, wherein the first portion of the first channel has a bandwidth equal to the LBT unit bandwidth; and in response to the determination that the LBT procedure is successful on at least the first portion of the first channel, transmit, to the base station, the first uplink transmission at least in part on the first portion of the first channel. ### Claim 8 (depends on 7) The method of claim 7, further comprising: determine that the LBT procedure is not successful at least on a second portion of the first channel, wherein the first uplink transmission is not transmitted on the second portion of the first channel, wherein the second portion of the first channel has a bandwidth equal to the LBT unit bandwidth. ### Claim 9 (depends on 7) The method of claim 7, further comprising: transmit, to the base station an indication of the LBT unit bandwidth, wherein the indication of the LBT unit bandwidth comprises uplink control information and is multiplexed with the first uplink transmission. ### Claim 10 (depends on 7) The method of claim 7, wherein the first part of the first channel comprises a bandwidth within at least two units of the LBT unit bandwidth, wherein the determination that the LBT procedure is successful on at least the first portion of the first channel comprises a determination that the LBT procedure is successful on each of the at least two units of the LBT unit bandwidth of the first part of the first channel. ### Claim 11 (depends on 7) The method of claim 7, wherein: the first part of the first channel comprises a bandwidth within at least two units of the LBT unit bandwidth; the first portion of the first channel comprises a first unit of the at least two units of the LBT unit bandwidth; the LBT procedure is not successful on a second unit of the at least two units of the LBT unit bandwidth; and to transmit the first uplink transmission to the base station further comprises determining not to transmit on the second unit of the at least two units of the LBT unit bandwidth in response to the LBT procedure being not successful on the second unit of the at least two units of the LBT unit bandwidth. ### Claim 12 (depends on 7) The method of claim 7, wherein the LBT unit bandwidth is determined based on cell specific signaling included in the configuration information. ### Claim 13 A method, comprising: communicate with a user equipment (UE); exchange, with the UE, configuration information, wherein the configuration information is useable to: compare a bandwidth of a bandwidth part indicated in the configuration information divided by an integer greater than 1, and a minimum unit bandwidth based on a minimum channel bandwidth, per subcarrier spacing (SCS); determine, based on the configuration information, a listen before talk (LBT) unit bandwidth, wherein the LBT unit bandwidth is the larger of: the bandwidth of the bandwidth part indicated in the configuration information divided by the integer greater than 1, and the minimum unit bandwidth based on the minimum channel bandwidth, per subcarrier spacing (SCS); and determine whether a first part of a first channel has a bandwidth within a single unit of the LBT unit bandwidth; transmit, to the UE, an uplink grant scheduling a first uplink transmission on at least the first part of the first channel; and receive, from the UE, the first uplink transmission at least in part on a first portion of the first channel, wherein the first portion of the first channel has a bandwidth equal to the LBT unit bandwidth, wherein a LBT procedure is successful on at least the first portion of the first channel, wherein the LBT procedure is performed either: using the LBT unit bandwidth on the first channel in response to a determination that the first part of the first channel has a bandwidth within the single unit of the LBT unit bandwidth; or using a first bandwidth of the first channel in response to a determination that the first part of the first channel has a bandwidth that is not within the single unit of the LBT unit bandwidth. ### Claim 14 (depends on 13) The method of claim 13, further comprising: receive, from the UE, an indication of the LBT unit bandwidth, wherein the indication of the LBT unit bandwidth comprises uplink control information and is multiplexed with the first uplink transmission. ### Claim 15 (depends on 13) The method of claim 13, wherein the LBT unit bandwidth is determinable based on cell specific signaling included in the configuration information. ### Claim 16 (depends on 13) The method of claim 13, wherein the first part of the first channel comprises a bandwidth within at least two units of the LBT unit bandwidth. ### Claim 17 (depends on 16) The method of claim 16, wherein the first portion of the first channel comprises a first unit of the at least two units of the LBT unit bandwidth. ### Claim 18 (depends on 17) The method of claim 17, wherein: the LBT procedure is not successful on a second unit of the at least two units of the LBT unit bandwidth; and the first uplink transmission is not received on the second unit of the at least two units of the LBT unit bandwidth.