# US 12,192,007 B2 · Efficient and robust acknowledgement procedures for new radio operation in unlicensed bands > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,007 B2 - Document ID: US12192007B2 - Status: Granted - Kind: B2 - Application number: 17/266,785 - Filed: 2019-08-08 - Published: 2021-11-04 - Granted: 2025-01-07 - Earliest claimed: 2018-08-08 - Assignees: InterDigital Patent Holdings, Inc. - Applicants: Interdigital Patent Holdings, Inc. - Inventors: Ahmad Reza Hedayat; Shahrokh Nayeb Nazar; Oghenekome Oteri; Hanqing Lou; Rui Yang - Web page: https://patentgrep.com/patent/US12192007B2 ## CPC - H04L 1/1819: {with retransmission of additional or different redundancy} - H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)} - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/1896: {ARQ related signaling} - 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 74/002: {Transmission of channel access control information} - H04W 74/0816: with collision avoidance - H04L 1/1614: {using bitmaps} - 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 Systems, methods, and devices for efficient and robust handling of acknowledgements in new radio unlicensed bands (NR-U) environments. A wireless transmit receive unit (WTRU) may receive control information and a data transmission from a gNB in a first interval (i.e., transport block or channel occupancy time), wherein the control information may include an indication of uplink resources. The data transmission may require some sort of acknowledgement (i.e., HARQ feedback). The WTRU may attempt to transmit the acknowledgement in the indicated uplink resources, but the gNB may not receive the acknowledgement. The WTRU may receive control information and a data transmission from the gNB in a second interval, including an indication to aggregate any previously unsuccessful acknowledgement transmissions. The WTRU may transmit an aggregated acknowledgement including previous unsuccessful acknowledgements and any additional acknowledgements from the current interval. In some cases, look-before-talk procedures may be used. ## Claims ### Claim 1 A method implemented by a wireless transmit receive unit (WTRU), the method comprising: receiving radio resource control (RRC) information regarding parameters for performing Type 2 Hybrid Automatic Repeat Request (HARQ) feedback; receiving, while operating in New Radio Unlicensed (NR-U), first control information for a first physical downlink shared channel (PDSCH) transmission in a first physical downlink control channel (PDCCH) transmission, wherein the first control information includes a first HARQ feedback timing indicator; determining not to send hybrid automatic repeat request (HARQ) feedback for the first PDSCH transmission based on a value of the first HARQ feedback timing indicator and the RRC information; receiving second control information for a second PDSCH transmission in a second PDCCH transmission; sending a first physical uplink control channel (PUCCH) transmission that includes HARQ feedback for the second PDSCH transmission based on the second control information and the RRC information; receiving third control information for a third PDSCH transmission in a third PDCCH transmission, wherein the third control information includes an index indicating a PDSCH group, wherein the third control information includes downlink assignment information; and sending, in a NR-U channel, a second PUCCH transmission that includes aggregated HARQ feedback based on the third control information and the RRC information, wherein the HARQ feedback for the first PDSCH transmission is aggregated with a HARQ feedback for the third PDSCH transmission to create the aggregated HARQ feedback based on the index indicating the PDSCH group, the downlink assignment information, and the RRC information. ### Claim 2 (depends on 1) The method of claim 1, wherein the second control information includes a second HARQ feedback timing indicator used to send the first second PUCCH transmission. ### Claim 3 (depends on 1) The method of claim 1, wherein the HARQ feedback for the third PDSCH transmission is sent based on timing indicated by a third HARQ feedback timing indicator. ### Claim 4 (depends on 1) The method of claim 1, wherein the HARQ feedback for the third PDSCH transmission is sent on a Physical Uplink Control Channel (PUCCH) resource determined from the third control information. ### Claim 5 (depends on 1) The method of claim 1, wherein the first HARQ feedback timing indicator is a first PDSCH-to-HARQ timing indicator. ### Claim 6 (depends on 1) The method of claim 1, further comprising performing a listen-before-talk (LBT) prior to sending the first PUCCH transmission or the second PUCCH transmission. ### Claim 7 (depends on 1) The method of claim 1, wherein the value of the first HARQ feedback timing indicator is outside of a current channel occupancy time (COT). ### Claim 8 A wireless transmit receive unit (WTRU), the WTRU comprising: a processor operatively coupled to a transceiver; the transceiver configured to receive radio resource control (RRC) information regarding parameters for performing Type 2 Hybrid Automatic Repeat Request (HARQ) feedback; the processor configured to receive, while operating in New Radio Unlicensed (NR-U), first control information for a first physical downlink shared channel (PDSCH) transmission in a first physical downlink control channel (PDCCH) transmission, wherein the first control information further includes a first HARQ feedback timing indicator; the processor configured to determine not to send hybrid automatic repeat request (HARQ) feedback for the first PDSCH transmission based on a value of the first HARQ feedback timing indicator and the RRC information; the transceiver configured to receive second control information for a second PDSCH transmission in a second PDCCH transmission; sending a first physical uplink control channel (PUCCH) transmission that includes HARQ feedback for the second PDSCH transmission based on the second control information and the RRC information; the transceiver configured to receive third control information for a third PDSCH transmission in a third PDCCH transmission, wherein the third control information includes an index indicating a PDSCH group, wherein the third control information includes downlink assignment information; and the transceiver configured to send a second PUCCH transmission that includes aggregated HARQ feedback based on the third control information, wherein the HARQ feedback for the first PDSCH transmission is aggregated with a HARQ feedback for the third PDSCH transmission to create the aggregated HARQ feedback based on the index indicating the PDSCH group, the downlink assignment information, and the RRC information. ### Claim 9 (depends on 8) The WTRU of claim 8, wherein the second control information includes a second HARQ feedback timing indicator used to send the first PUCCH transmission. ### Claim 10 (depends on 8) The WTRU of claim 8, where the HARQ feedback for the third PDSCH transmission is sent based on timing indicated by a third HARQ feedback timing indicator. ### Claim 11 (depends on 8) The WTRU of claim 8, wherein the HARQ feedback for the third PDSCH transmission is sent on a Physical Uplink Control Channel (PUCCH) resource determined from the third control information. ### Claim 12 (depends on 8) The WTRU of claim 8, wherein the first HARQ feedback timing indicator is a first PDSCH-to-HARQ timing indicator. ### Claim 13 (depends on 8) The WTRU of claim 8, the processor and transceiver configured to perform a listen-before-talk (LBT) prior to sending the first PUCCH transmission or the second PUCCH transmission. ### Claim 14 (depends on 8) The WTRU of claim 8, wherein the value of the first HARQ feedback timing indicator is outside of a current channel occupancy time (COT). ### Claim 15 A method implemented by a wireless transmit receive unit (WTRU), the method comprising: receiving radio resource control (RRC) information regarding parameters for performing Type 2 Hybrid Automatic Repeat Request (HARQ) feedback; receiving first control information for a first physical downlink shared channel (PDSCH) transmission in a first physical downlink control channel (PDCCH) transmission, wherein the first control information further includes a first HARQ feedback timing indicator, wherein the value of the first HARQ feedback timing indicator is outside of a current channel occupancy time (COT); determining not to send a first hybrid automatic repeat request (HARQ) feedback for the first PDSCH transmission based on a value of the first HARQ feedback timing indicator and the RRC information; receiving second control information for a second PDSCH transmission in a second PDCCH transmission, wherein the second control information includes an an index indicating a PDSCH group, wherein the second control information includes downlink assignment information; and sending a physical uplink control channel (PUCCH) transmission that includes aggregated HARQ feedback based on the second control information, wherein the first HARQ feedback for the first PDSCH transmission is aggregated with a HARQ feedback for the second PDSCH transmission to create the aggregated HARQ feedback based on the index indicating the PDSCH group and the RRC information. ### Claim 16 A wireless transmit receive unit (WTRU) comprising: a processor operatively coupled to a transceiver; the transceiver and processor configured to receive radio resource control (RRC) information regarding parameters for performing Type 2 Hybrid Automatic Repeat Request (HARQ) feedback; the transceiver and processor configured to receive first control information for a first physical downlink shared channel (PDSCH) transmission in a first physical downlink control channel (PDCCH) transmission, wherein the first control information further includes a first HARQ feedback timing indicator, wherein the value of the first HARQ feedback timing indicator is outside of a current channel occupancy time (COT); the transceiver and processor configured to determine not to send a first hybrid automatic repeat request (HARQ) feedback for the first PDSCH transmission based on a value of the first HARQ feedback timing indicator and the RRC information; the transceiver and processor configured to receive second control information for a second PDSCH transmission in a second PDCCH transmission, wherein the second control information includes an indication of an index indicating a PDSCH group, wherein the second control information includes downlink assignment information; and the transceiver and processor configured to send a physical uplink control channel (PUCCH) transmission that includes aggregated HARQ feedback based on the second control information, wherein the first HARQ feedback for the first PDSCH transmission is aggregated with a HARQ feedback for the second PDSCH transmission to create the aggregated HARQ feedback based on the index indicating the PDSCH group, the downlink assignment information, and the RRC information.