Method for operating a network-infrastructure network unit (BS) of a cell-based wireless communication network (CELL), the method comprising: - determining a first group (Gr1) of a plurality of roadside network units (UE1) within a cell (C) of the network-infrastructure network unit (BS), the roadside network units (UE1) of the first group (Gr1) being intended to use a first sidelink channel (SC1) in an unlicensed frequency band (NLFB); - determining a second group (Gr2) of a plurality of roadside network units (UE2) within the cell (C) of the network-infrastructure network unit (BS), the roadside network units (UE2) of the second group (Gr2) being intended to use a first sidelink channel (SC1) in a licensed frequency band (LFB), and the first and second groups (Gr1, Gr2) being disjoint; - receiving a first scheduling request message (BSR) from a first roadside network unit (UE1) of the first group (Gr1) on an uplink channel (UC); - determining a first scheduling grant message (G3), the first scheduling grant message (G3) comprising an allocation of at least one sidelink resource (PRB, MCS, ...) of a first sidelink channel (SC1) in an unlicensed frequency band (NLFB) to the first roadside network unit (UE1) of the first group (Gr1); - sending the first scheduling grant message (G3) to the first roadside network unit (UE1) on a downlink channel (DC); - receiving a second scheduling request message (BSR) from a second roadside network unit (UE2) of the second group (Gr2) on the uplink channel (UC); - determining a second scheduling grant message (G4), the second scheduling grant message (G4) comprising an allocation of at least one sidelink resource (PRB, MCS, ...) of a second sidelink channel (SC2) in a licensed frequency range (LFB) to the second roadside network unit (UE2) of the second group (Gr2); and - sending the second scheduling grant message (G4) to the second roadside network unit (UE2) on a downlink channel (DC). - determining a first group (Gr1) of a plurality of roadside network units (UE1) within a cell (C) of the network-infrastructure network unit (BS), the roadside network units (UE1) of the first group (Gr1) being intended to use a first sidelink channel (SC1) in an unlicensed frequency band (NLFB); - determining a second group (Gr2) of a plurality of roadside network units (UE2) within the cell (C) of the network-infrastructure network unit (BS), the roadside network units (UE2) of the second group (Gr2) being intended to use a first sidelink channel (SC1) in a licensed frequency band (LFB), and the first and second groups (Gr1, Gr2) being disjoint; - receiving a first scheduling request message (BSR) from a first roadside network unit (UE1) of the first group (Gr1) on an uplink channel (UC); - determining a first scheduling grant message (G3), the first scheduling grant message (G3) comprising an allocation of at least one sidelink resource (PRB, MCS, ...) of a first sidelink channel (SC1) in an unlicensed frequency band (NLFB) to the first roadside network unit (UE1) of the first group (Gr1); - sending the first scheduling grant message (G3) to the first roadside network unit (UE1) on a downlink channel (DC); - receiving a second scheduling request message (BSR) from a second roadside network unit (UE2) of the second group (Gr2) on the uplink channel (UC); - determining a second scheduling grant message (G4), the second scheduling grant message (G4) comprising an allocation of at least one sidelink resource (PRB, MCS, ...) of a second sidelink channel (SC2) in a licensed frequency range (LFB) to the second roadside network unit (UE2) of the second group (Gr2); and - sending the second scheduling grant message (G4) to the second roadside network unit (UE2) on a downlink channel (DC). <EOS>