Patent ID: 8036691

Claim:
A method for data transmission via an air interface in a radio communication system, comprising: transmitting a first signal from a first radio station to at least first and second terminals, the first signal containing at least first and second data, the first data being multiplied by a first weight factor before transmission from first radio station, the second data being multiplied by a third weight factor before transmission from the first radio station; calculating the first weight factor taking into account a second weight factor used by a second radio station for transmission of a second signal containing at least the first and second data, the second radio station multiplying the first data by the second weight factor before transmission, the first weight factor being calculated such that simultaneous reception of both the first signal and the second signal at the first terminal cause the first data to be substantially cancelled; receiving first and second channel state information from the first terminal via broadcast transmissions, the first weight vector being calculated by the first radio station taking into account the first and second channel state information, the first channel state information relating to a first transmission channel from the first radio station to the first terminal and the second channel state information relating to a second transmission channel from the second radio station to the first terminal; calculating the third weight factor taking into account a fourth weight factor used by the second radio station for transmission of the second signal, the second radio station multiplying the second data by the fourth weight factor weight factor before transmission, the third weight factor being calculated such that simultaneous reception of both the first signal and the second signal at the second terminal causes the second data to be substantially cancelled while the first data can be decoded; receiving third and fourth channel state information from the second terminal via broadcast transmissions, and the third weight factor being calculated by the first radio station taking into account the third and fourth channel state information, the third channel state information relating to a third transmission channel from the second radio station to the second terminal and the fourth channel state information relating to a fourth transmission channel from the first radio station to the second terminal.