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