# US 11,445,538 B2 · Channel access procedure for UL transmission > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,538 B2 - Document ID: US11445538B2 - Status: Granted - Kind: B2 - Application number: 16/749,763 - Filed: 2020-01-22 - Published: 2020-07-30 - Granted: 2022-09-13 - Earliest claimed: 2019-01-24 - Assignees: Mediatek Inc. - Applicants: Mediatek Inc. - Inventors: Cheng-Rung Tsai; Chiou-Wei Tsai - Web page: https://patentgrep.com/patent/US11445538B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/1819: {with retransmission of additional or different redundancy} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/1268: of uplink data flows - H04L 1/1671: {the supervisory signal being transmitted together with control information} - H04L 5/0096: {Indication of changes in allocation} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Aspects of the disclosure further provide an apparatus and a method for wireless communication. The apparatus includes processing circuitry that receives, from a base station (BS), a downlink (DL) grant scheduling an uplink (UL) transmission to the BS. The DL grant indicates a first type of channel access procedure for the UL transmission. The processing circuitry performs a channel access procedure for the UL transmission according to the first type of channel access procedure indicated by the DL grant. ## Claims ### Claim 1 A method of wireless communication at a user equipment (UE), the method comprising: receiving, from a base station (BS), channel occupancy information indicating a duration in a time domain and a location in a frequency domain for a channel occupancy that is initiated by the BS; when an uplink (UL) transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS, performing a first type of channel access procedure for the UL transmission; and when the UL transmission is not scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS, performing a second type of channel access procedure for the UL transmission. ### Claim 2 (depends on 1) The method of claim 1, wherein the second type of channel access procedure is indicated in a downlink (DL) grant scheduling the UL transmission. ### Claim 3 (depends on 1) The method of claim 1, further comprising: determining whether the UL transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS. ### Claim 4 (depends on 1) The method of claim 1, wherein the first type of channel access procedure and the second type of channel access procedure are the same. ### Claim 5 (depends on 2) The method of claim 2, wherein the DL grant schedules a DL reception and indicates a timing offset between the DL reception and the UL transmission. ### Claim 6 (depends on 5) The method of claim 5, wherein the UL transmission includes hybrid automatic repeat request-acknowledge (HARQ-ACK) information for the DL reception. ### Claim 7 (depends on 1) The method of claim 1, wherein the channel occupancy information is carried by downlink control information (DCI). ### Claim 8 An apparatus, comprising processing circuitry configured to: receive, from a base station (BS), channel occupancy information indicating a duration in a time domain and a location in a frequency domain for a channel occupancy that is initiated by the BS; when an uplink (UL) transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS, perform a first type of channel access procedure for the UL transmission; and when the UL transmission is not scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS, perform a second type of channel access procedure for the UL transmission. ### Claim 9 (depends on 8) The apparatus of the claim 8, wherein the second type of channel access procedure is indicated in a downlink (DL) grant scheduling the UL transmission. ### Claim 10 (depends on 8) The apparatus of the claim 8, wherein the processing circuitry is further configured to: determine whether the UL transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS. ### Claim 11 (depends on 8) The apparatus of the claim 8, wherein the first type of channel access procedure and the second type of channel access procedure are the same. ### Claim 12 (depends on 9) The apparatus of the claim 9, wherein the DL grant schedules a DL reception and indicates a timing offset between the DL reception and the UL transmission. ### Claim 13 (depends on 12) The apparatus of the claim 12, wherein the UL transmission includes hybrid automatic repeat request-acknowledge (HARQ-ACK) information for the DL reception. ### Claim 14 (depends on 8) The apparatus of the claim 8, wherein the channel occupancy information is carried by downlink control information (DCI). ### Claim 15 A non-transitory computer-readable storage medium storing a program executable by at least one processor to perform: receiving, from a base station (BS), channel occupancy information indicating a duration in a time domain and a location in a frequency domain for a channel occupancy that is initiated by the BS; when an uplink (UL) transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS, performing a first type of channel access procedure for the UL transmission; and when the UL transmission is not scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS, performing a second type of channel access procedure for the UL transmission. ### Claim 16 (depends on 15) The non-transitory computer-readable storage medium of claim 15, wherein the second type of channel access procedure is indicated in a downlink (DL) grant scheduling the UL transmission. ### Claim 17 (depends on 15) The non-transitory computer-readable storage medium of claim 15, wherein the program executable by at least one processor is further to perform: determining whether the UL transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS. ### Claim 18 (depends on 15) The non-transitory computer-readable storage medium of claim 15, wherein the first type of channel access procedure and the second type of channel access procedure are the same. ### Claim 19 (depends on 16) The non-transitory computer-readable storage medium of claim 16, wherein the DL grant schedules a DL reception and indicates a timing offset between the DL reception and the UL transmission. ### Claim 20 (depends on 19) The non-transitory computer-readable storage medium of claim 19, wherein the UL transmission includes hybrid automatic repeat request-acknowledge (HARQ-ACK) information for the DL reception.