A method includes: receiving, from a base station, time division duplex uplink-downlink (TDD UL-DL) configuration including information related to a UL resource; receiving, from the base station, information related to the start of sidelink (SL) symbols, information related to the number of SL symbols, and a bitmap indicating one or more slots in an SL resource pool; and determining the SL resource pool. Second slots can be determined by excluding, from first slots, one or more slots in which at least one SL symbol is not set as the UL resource. Third slots can be determined by excluding, from the second slots, one or more slots in which a sidelink-synchronization signal block (S-SSB) is set. Fourth slots can be determined by excluding one or more reserved slots from the third slots. Fifth slots, among the fourth slots, can be determined as the SL resource pool based on the bitmap.