An interference constraint and SINR balancing based coordinated multicell beamforming

We propose a coordinated multicell beamformer design based on balancing signal-to-interference-plus-noise ratios (SINRs) to multiple levels. Instead of attaining an overall balance of SINRs for all users in all cells, the proposed algorithm allows users in various cells to achieve different maximum possible balanced SINRs subject to the individual base station transmission power. The uplink-downlink duality is used for converting the downlink problem into the uplink beamformer design problem and the overall problem is solved at multiple stages with various interference constraints.