# US 12,015,491 B2 · Method and apparatus for reporting HARQ feedback information to base station in NR V2X > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,491 B2 - Document ID: US12015491B2 - Status: Granted - Kind: B2 - Application number: 17/754,696 - Filed: 2020-10-12 - Published: 2023-10-05 - Granted: 2024-06-18 - Earliest claimed: 2019-10-10 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Seungmin Lee; Hanbyul Seo; Daesung Hwang; Woosuk Ko - Web page: https://patentgrep.com/patent/US12015491B2 ## CPC - H04L 1/189: {Transmission or retransmission of more than one copy of a message} - H04L 1/1896: {ARQ related signaling} - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1825: Adaptation of specific ARQ protocol parameters according to transmission conditions - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 72/20: Control channels or signalling for resource management - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 92/18: between terminal devices - 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 performing, by a first apparatus, wireless communication, and an apparatus for supporting same. The method may comprise the steps of: receiving, from a base station, information related to a sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource; transmitting, to a second apparatus, a medium access control packet data unit (MAC PDU) in which hybrid automatic repeat request (HARQ) feedback is disabled, on the basis of the SL resource; generating ACK information related to the transmission of the MAC PDU on the basis that the HARQ feedback is disabled for the MAC PDU and retransmission for the MAC PDU is not required; and transmitting, to the base station, the ACK information on the basis of the PUCCH resource. ## Claims ### Claim 1 A method for performing wireless communication by a first device, the method comprising: receiving, from a base station, information related to a sidelink (SL) grant and information related to a physical uplink control channel (PUCCH) resource; obtaining a medium access control (MAC) packet data unit (PDU); generating hybrid automatic repeat request (HARQ) feedback information related to the MAC PDU; and transmitting, to the base station, the HARQ feedback information based on the PUCCH resource, wherein, based on that the first device does not transmit the MAC PDU, due to prioritization, the HARQ feedback information is generated as a negative acknowledgment (NACK). ### Claim 2 (depends on 1) The method of claim 1, wherein the transmission of the MAC PDU is skipped based on a priority of the MAC PDU in the prioritization. ### Claim 3 (depends on 1) The method of claim 1, wherein, based on that the first device does not receive a physical sidelink feedback channel (PSFCH) in a PSFCH resource related to a physical sidelink shared channel (PSSCH) through which the MAC PDU is transmitted, due to prioritization, the HARQ feedback information is generated as the NACK. ### Claim 4 (depends on 3) The method of claim 3, wherein the reception of the PSFCH is skipped based on a priority of PSFCH reception in the prioritization. ### Claim 5 (depends on 3) The method of claim 3, wherein the PSFCH resource related to the PSSCH is determined based on a subchannel for the PSSCH and a slot for the PSSCH, and wherein a resource for the PSSCH is allocated by the SL grant. ### Claim 6 (depends on 1) The method of claim 1, wherein, based on that HARQ feedback is disabled for the MAC PDU and retransmission of the MAC PDU is not required, the HARQ feedback information is generated as a positive acknowledgment (ACK). ### Claim 7 (depends on 1) The method of claim 1, wherein based on that HARQ feedback is disabled for the MAC PDU, and retransmission of the MAC PDU is required, and there is no SL grant available for retransmission of the MAC PDU, the HARQ feedback information is generated as the NACK. ### Claim 8 A first device adapted to perform wireless communication, the first device comprising: at least one transceiver; at least one processor; and at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first device to perform operations comprising: receiving, from a base station, information related to a sidelink (SL) grant and information related to a physical uplink control channel (PUCCH) resource; obtaining a medium access control (MAC) packet data unit (PDU); generating hybrid automatic repeat request (HARQ) feedback information related to the MAC PDU; and transmitting, to the base station, the HARQ feedback information based on the PUCCH resource, wherein, based on that the first device does not transmit the MAC PDU, due to prioritization, the HARQ feedback information is generated as a negative acknowledgment (NACK). ### Claim 9 (depends on 8) The first device of claim 8, wherein the transmission of the MAC PDU is skipped based on a priority of the MAC PDU in the prioritization. ### Claim 10 (depends on 8) The first device of claim 8, wherein, based on that the first device does not receive a physical sidelink feedback channel (PSFCH) in a PSFCH resource related to a physical sidelink shared channel (PSSCH) through which the MAC PDU is transmitted, due to prioritization, the HARQ feedback information is generated as the NACK. ### Claim 11 (depends on 10) The first device of claim 10, wherein the reception of the PSFCH is skipped based on a priority of PSFCH reception in the prioritization. ### Claim 12 A processing device adapted to control a first device performing wireless communication, the processing device comprising: at least one processor; and at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first device to perform operations comprising: receiving, from a base station, information related to a sidelink (SL) grant and information related to a physical uplink control channel (PUCCH) resource; obtaining a medium access control (MAC) packet data unit (PDU); generating hybrid automatic repeat request (HARQ) feedback information related to the MAC PDU; and transmitting, to the base station, the HARQ feedback information based on the PUCCH resource, wherein, based on that the first device does not transmit the MAC PDU, due to prioritization, the HARQ feedback information is generated as a negative acknowledgment (NACK). ### Claim 13 (depends on 12) The processing device of claim 12, wherein the transmission of the MAC PDU is skipped based on a priority of the MAC PDU in the prioritization. ### Claim 14 (depends on 12) The processing device of claim 12, wherein, based on that the first device does not receive a physical sidelink feedback channel (PSFCH) in a PSFCH resource related to a physical sidelink shared channel (PSSCH) through which the MAC PDU is transmitted, due to prioritization, the HARQ feedback information is generated as the NACK. ### Claim 15 (depends on 14) The processing device of claim 14, wherein the reception of the PSFCH is skipped based on a priority of PSFCH reception in the prioritization.