# US 12,763,876 B2 · Method and apparatus for determining feedback resource 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 12,763,876 B2 - Document ID: US12763876B2 - Status: Granted - Kind: B2 - Application number: 18/521,660 - Filed: 2023-11-28 - Published: 2024-03-28 - Granted: 2026-10-13 - Earliest claimed: 2019-07-10 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Daesung Hwang; Seungmin Lee; Hanbyul Seo - Web page: https://patentgrep.com/patent/US12763876B2 ## CPC - H04L 1/0055: {MAP-decoding} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04W 72/02: Selection of wireless resources by user or terminal - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - 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 A method for performing, by a first device, wireless communication and an apparatus for supporting same are provided. The method includes: receiving a physical sidelink shared channel (PSSCH) from a second device; determining a physical sidelink feedback channel (PSFCH) resource associated with the PSSCH; and transmitting, to the second device, a hybrid automatic repeat request (HARQ) feedback on the PSFCH resource. Here, at least one subchannel for the PSSCH is associated with at least one first PSFCH resource including at least one second PSFCH resource, each second PSFCH resource included in the at least one first PSFCH resource is associated with each slot on the at least one subchannel, and the PSFCH resource may be determined on the basis of information related to the at least one subchannel for the PSSCH, information related to at least one slot for the PSSCH, and a source ID of the second device. ## Claims ### Claim 1 A method, comprising: obtaining, by a first device, configuration information regarding a set of physical sidelink feedback channel (PSFCH) resource blocks (RBs) for PSFCH transmission; receiving, by the first device from a second device, a physical sidelink shared channel (PSSCH); allocating, by the first device, at least one PSFCH RB from the set of PSFCH RBs, to a slot and a subchannel related to the PSSCH; determining, by the first device, PSFCH resources based on the at least one PSFCH RB and at least one cyclic shift; determining, by the first device, based on a source identifier (ID) of the second device, a PSFCH resource among the PSFCH resources; and performing, by the first device to the second device, the PSFCH transmission based on the PSFCH resource in response to the reception of the PSSCH. ### Claim 2 (depends on 1) The method of claim 1, wherein the at least one PSFCH RB is determined from the set of PSFCH RBs based on (i) a first grouping in which each PSFCH RB group of the first grouping is allocated to at least one PSSCH subchannel, and (ii) a second grouping, within each PSFCH RB group of the first grouping, in which each PSFCH RB group of the second grouping is allocated to a respective slot on the at least one PSSCH subchannel. ### Claim 3 (depends on 2) The method of claim 2, wherein PSFCH RB groups of the first grouping are related to one PSSCH subchannel. ### Claim 4 (depends on 2) The method of claim 2, wherein each PSFCH RB group of the first grouping is related to a corresponding PSSCH subchannel. ### Claim 5 (depends on 1) The method of claim 1, wherein the PSFCH resources are first indexed according to an ascending order of a PSFCH RB index, and then according to an ascending order of a cyclic shift index. ### Claim 6 (depends on 1) The method of claim 1, wherein a size of the at least one PSFCH RB is a value which is obtained by dividing a number of PSFCH RBs included in the set of PSFCH RBs by a value which is obtained by multiplying a number of subchannels in a resource pool by a value related to a period of the PSFCH resource. ### Claim 7 (depends on 6) The method of claim 6, wherein the value related to the period of the PSFCH resource is a number of PSSCH slots related to a slot including the PSFCH resource. ### Claim 8 (depends on 1) The method of claim 1, wherein, based on performing groupcast communication between the first device and the second device, the PSFCH resource is determined further based on an ID of the first device among the PSFCH resources. ### Claim 9 (depends on 8) The method of claim 8, wherein the ID of the first device is an ID for identifying the first device within a group related to the groupcast communication. ### Claim 10 (depends on 1) The method of claim 1, wherein a cyclic shift applied to hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information in the PSFCH transmission is determined based on at least one of the source ID of the second device or an ID of the first device. ### Claim 11 A 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: obtaining configuration information regarding a set of physical sidelink feedback channel (PSFCH) resource blocks (RBs) for PSFCH transmission; receiving, from a second device, a physical sidelink shared channel (PSSCH); allocating at least one PSFCH RB from the set of PSFCH RBs, to a slot and a subchannel related to the PSSCH; determining PSFCH resources based on the at least one PSFCH RB and at least one cyclic shift; determining, based on a source identifier (ID) of the second device, a PSFCH resource among the PSFCH resources; and performing, to the second device, the PSFCH transmission based on the PSFCH resource in response to the reception of the PSSCH. ### Claim 12 (depends on 11) The first device of claim 11, wherein the at least one PSFCH RB is determined from the set of PSFCH RBs based on (i) a first grouping in which each PSFCH RB group of the first grouping is allocated to at least one PSSCH subchannel, and (ii) a second grouping, within each PSFCH RB group of the first grouping, in which each PSFCH RB group of the second grouping is allocated to a respective slot on the at least one PSSCH subchannel. ### Claim 13 (depends on 12) The first device of claim 12, wherein PSFCH RB groups of the first grouping are related to one PSSCH subchannel. ### Claim 14 (depends on 12) The first device of claim 12, wherein each PSFCH RB group of the first grouping is related to a corresponding PSSCH subchannel. ### Claim 15 (depends on 11) The first device of claim 11, wherein the PSFCH resources are first indexed according to an ascending order of a PSFCH RB index, and then according to an ascending order of a cyclic shift index. ### Claim 16 A 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 a first device to perform operations comprising: obtaining configuration information regarding a set of physical sidelink feedback channel (PSFCH) resource blocks (RBs) for PSFCH transmission; receiving, from a second device, a physical sidelink shared channel (PSSCH); allocating at least one PSFCH RB from the set of PSFCH RBs, to a slot and a subchannel related to the PSSCH; determining PSFCH resources based on the at least one PSFCH RB and at least one cyclic shift; determining, based on a source identifier (ID) of the second device, a PSFCH resource among the PSFCH resources; and performing, to the second device, the PSFCH transmission based on the PSFCH resource in response to the reception of the PSSCH. ### Claim 17 (depends on 16) The processing device of claim 16, wherein the at least one PSFCH RB is determined from the set of PSFCH RBs based on (i) a first grouping in which each PSFCH RB group of the first grouping is allocated to at least one PSSCH subchannel, and (ii) a second grouping, within each PSFCH RB group of the first grouping, in which each PSFCH RB group of the second grouping is allocated to a respective slot on the at least one PSSCH subchannel. ### Claim 18 (depends on 17) The processing device of claim 17, wherein PSFCH RB groups of the first grouping are related to one PSSCH subchannel. ### Claim 19 (depends on 17) The processing device of claim 17, wherein each PSFCH RB group of the first grouping is related to a corresponding PSSCH subchannel. ### Claim 20 (depends on 16) The processing device of claim 16, wherein the PSFCH resources are first indexed according to an ascending order of a PSFCH RB index, and then according to an ascending order of a cyclic shift index.