A controlling station (110, 400) comprising an antenna arrangement (420) with a number of antennas, which each covers one of a number of adjacent cells, with a main beam with a beamwidth that extends into two immediately adjacent cells. The controlling station (110, 400) is adapted to: -transmit on a control channel on a first number of antennas, -measure the output power on the traffic channels on the first number of antennas, -if the traffic channel output power on any of said first number of antenna is above a threshold, transmission on the control channel is activated on a second number of antennas, -measure the traffic channel output power on each antenna in the antenna arrangement, -if the measured traffic channel output power on an antenna is below a second threshold and the traffic channel on the antennas of both adjacent cells is active, the control channel transmissions on that antenna are deactivated.
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