There is provided mechanisms for shaping transmission beams in a wireless communications network. A method is performed by a network node. The method comprises acquiring channel measurements from wireless devices served by radio access network nodes using current beam forming parameters and being controlled by the network node. The method comprises determining, based on the channel measurements, desired beam forming parameters for shaping the transmission beams for at least one of the radio access network nodes. The method comprises initiating network controlled handover of at least some of the wireless devices served by the radio access network nodes based on the desired beam forming parameters. The method comprises initiating a change of the current beam forming parameters to the desired beam forming parameters for shaping the transmission beams for the at least one of the radio access network nodes only after having initiated said network controlled handover.