A method and apparatus for configuration of sidelink channel resource units for sidelink communications in a wireless communication network is disclosed. In one embodiment, a method performed by a first wireless communication device, comprising: performing sidelink communication on a first sidelink channel resource unit of a first sidelink channel, determining a second sidelink channel resource unit of a second sidelink channel according to the first sidelink channel in a sidelink channel couple; and performing sidelink communication on the second sidelink channel resource unit; wherein the sidelink channel couple comprises the first sidelink channel and the second sidelink channel, and wherein a first sidelink channel resource unit comprises a first number of first resource units in the time domain and a second number of second resource units in the frequency domain, and the second sidelink channel resource unit comprises a third number of first resource units in the time domain and a fourth number of second resource units in the frequency domain.