There is disclosed a method of operating an allocating radio node in a wireless communication network, the method comprising allocating, to a second radio node, a frequency range for communication, the frequency range being part of an operating bandwidth of the second radio node, the frequency range comprising an integer number S of subcarriers, the number S of subcarriers corresponding to a value of a limitation relation applied to a fraction of the operating bandwidth, the fraction corresponding to N1/N2, wherein N1 and N2 are integers and N1 is smaller than N2. The disclosure also pertains to related devices and methods.