Embodiments include a beam determining unit intended to be connected to a wireless heterogeneous network and a beam-searching method for a wireless heterogeneous network. In the context of a millimeter wave heterogeneous network, it is proposed to do away with the conventional exhaustive beam-searching procedure which is both time and power consuming. Instead, it is proposed a two-step procedure where a line of sight path is determined between a user equipment and a small cell of the millimeter wave heterogeneous network based on positioning information of the user equipment and the small cell. Then, it is determined an optimal antenna beam pair comprising antenna beams at the user equipment and the small cell based on the determined line of sight path and the antenna beam directions available at the user equipment and the small cell level.
