There is provided mechanisms for beamforming of beams. A method is performed by a radio transceiver device. The method comprises performing beamforming by switching between communicating in a first set of beam patterns and in a second set of beam patterns. The first set of beam patterns and the second set of beam patterns comprise equally many beams. Signals in the beams are communicated with a first set of other radio transceiver devices in the first set of beam patterns and with a second set of other radio transceiver devices in the second set of beam patterns. The first set of other radio transceiver devices and the second set of other radio transceiver devices at least partly overlap.