The proposed method can be applied to the device(s) described in the various embodiments of the present disclosure. First, the processor 202 of the base station 200 may control the transceiver 206 to transmit, to a first device, information related to a physical uplink control channel (PUCCH) resource for reporting hybrid automatic repeat request (HARQ) feedback information and information related to a configured grant (CG) resource for sidelink (SL). In addition, the processor 202 of the base station 200 may control the transceiver 206 to receive, from the first device, ACK information on the PUCCH resource, based on no physical sidelink control channel (PSCCH) transmission by the first device on the CG resource in a single period. For example, a priority value of the ACK information may be same as a largest priority value among at least one possible priority value related to the CG resource.