Method and device for allocating SL HARQ feedback report resource in NR V2X

A first device configured to perform wireless communication, the first device comprising:

• one or more memories storing instructions;
• one or more transceivers;
• and
• one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to:
• receive, from a base station through a physical downlink control channel (PDCCH), a downlink control information (DCI) for scheduling sidelink (SL) resources,
• wherein the DCI includes information related to a time between a physical sidelink feedback channel (PSFCH) resource and a physical uplink control channel (PUCCH) resource and information related to the PUCCH resource;
• transmit, to a second device, a plurality of physical sidelink control channels (PSCCHs) and a plurality of physical sidelink shared channels (PSSCHs), based on the DCI;
• determining a plurality of PSFCH resources, based on indices of slots related to the plurality of PSSCHs, indices of subchannels related to the plurality of PSSCHs, and a source ID of the first device;
• receive, from the second device, a plurality of SL hybrid automatic repeat request (HARQ) feedbacks related to the plurality of PSSCHs on the plurality of PSFCH resources;
• and
• transmit, to the base station, one SL HARQ feedback on one PUCCH resource, based on the information related to the time and the information related to the PUCCH resource,
• wherein the one PUCCH resource is allocated after a last PSFCH resource among the plurality of PSFCH resources.

An apparatus configured to control a first user equipment (UE), the apparatus comprising:

• one or more processors;
• and
• one or more memories operably connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:
• receive, from a base station through a physical downlink control channel (PDCCH), a downlink control information (DCI) for scheduling sidelink (SL) resources,
• wherein the DCI includes information related to a time between a physical sidelink feedback channel (PSFCH) resource and a physical uplink control channel (PUCCH) resource and information related to the PUCCH resource;
• transmit, to a second UE, a plurality of physical sidelink control channels (PSCCHs) and a plurality of physical sidelink shared channels (PSSCHs), based on the DCI;
• determining a plurality of PSFCH resources, based on indices of slots related to the plurality of PSSCHs, indices of subchannels related to the plurality of PSSCHs, and a source ID of the first UE;
• receive, from the second UE, a plurality of SL hybrid automatic repeat request (HARQ) feedbacks related to the plurality of PSSCHs on the plurality of PSFCH resources;
• and
• transmit, to the base station, one SL HARQ feedback on one PUCCH resource, based on the information related to the time and the information related to the PUCCH resource,
• wherein the one PUCCH resource is allocated after a last PSFCH resource among the plurality of PSFCH resources.