A method for a first apparatus to perform wireless communication, the method comprising: receiving (S1410) time division duplex-uplink-downlink, TDD-UL-DL, configuration information including information related to a first slot pattern and information related to a second slot pattern from a base station, wherein the information related to the first slot pattern includes information related to a period of the first slot pattern and information related to a first UL resource, and wherein the information related to the second slot pattern includes information related to a period of the second slot pattern and information related to a second UL resource; obtaining (S1420) a number of first sidelink, SL, slots related to the first slot pattern and a number of second SL slots related to the second slot pattern, based on a first subcarrier spacing, SCS, related to SL communication and the TDD-UL-DL configuration information; and transmitting (S1430) a physical sidelink broadcast channel, PSBCH, including information, related to the number of the first SL slots and the number of the second SL slots, to a second apparatus, wherein the number of the first SL slots and the number of the second SL slots are expressed in a unit for counting a plurality of SL slots as one, based on i) the information related to the period of the first slot pattern, ii) the information related to the period of the second slot pattern, and iii) the first SCS, wherein the information, related to the number of the first SL slots and the number of the second SL slots, is 7-bit information, and wherein the SL communication is performed based on the number of the first SL slots and the number of the second SL slots. receiving (S1410) time division duplex-uplink-downlink, TDD-UL-DL, configuration information including information related to a first slot pattern and information related to a second slot pattern from a base station, wherein the information related to the first slot pattern includes information related to a period of the first slot pattern and information related to a first UL resource, and wherein the information related to the second slot pattern includes information related to a period of the second slot pattern and information related to a second UL resource; obtaining (S1420) a number of first sidelink, SL, slots related to the first slot pattern and a number of second SL slots related to the second slot pattern, based on a first subcarrier spacing, SCS, related to SL communication and the TDD-UL-DL configuration information; and transmitting (S1430) a physical sidelink broadcast channel, PSBCH, including information, related to the number of the first SL slots and the number of the second SL slots, to a second apparatus, wherein the number of the first SL slots and the number of the second SL slots are expressed in a unit for counting a plurality of SL slots as one, based on i) the information related to the period of the first slot pattern, ii) the information related to the period of the second slot pattern, and iii) the first SCS, wherein the information, related to the number of the first SL slots and the number of the second SL slots, is 7-bit information, and wherein the SL communication is performed based on the number of the first SL slots and the number of the second SL slots. <EOS>