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It is the object of the present invention to provide an improved beam forming in a mobile cellular network. The object of the present invention is achieved by a method of controlling beam forming in a mobile cellular network, wherein antenna units of base stations of a cluster of neigh bored base station Sapply a respective beam pattern sequence on each sector of a cell served by the respective base station, wherein the beam pattern sequence is selected from a respec tive predefined set of beam pattern sequences and each beam pattern sequence defines a sequence of beam Subsets used for communication with mobile units, one of the base stations of the cluster, which acts as trigger base station, informs all neighbored base stations of the cluster of neighbored base stations not to change their beam pattern sequence, the trigger base station controls the antenna unit of the trigger base station to change the beam …