Patent ID: 7050833

Claim:
A method for controlling beam formation of a downlink signal radiated from base stations of respective first and second radio cells to a mobile station in a mobile radio communication system, the base station respectively having a plurality of antennas and being set up for weighted radiation of a downlink signal to the mobile station using a weighting vector, the method comprising the steps of: specifying a set of weighting vectors at the mobile station and the base stations of the first and second radio cells, each weighting vector being assigned at least one code word; selecting an optimum weighting factor at the mobile station and transmitting a code word assigned to the optimum weighting vector to the base stations; and performing weighted radiation of the downlink signal using the weighting vector assigned to the code word at each of the base stations; wherein the weighting vectors are differently assigned to the code words at the base stations of the first and second radio cells so that the base stations weight the downlink signal using different weighting vectors on receipt of an identical code word, with at least some of the weighting vectors being defined to initiate simultaneous transmission of downlink signals via the plurality of antennas of a base station.