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As network deployments become denser, interference arises as a dominantperformance degradation factor. To confront with this trend, Long TermEvolution (LTE) incorporated features aiming at enabling cooperation amongdifferent base stations, a technique termed as Coordinated Multi Point (CoMP).Recent field trial results and theoretical studies of the performance of CoMPschemes revealed, however, that their gains are not as high as initiallyexpected, despite their large coordination overhead. In this paper, we reviewrecent advanced Coordinated Beamforming (CB) schemes, a special family of CoMPthat reduces the coordination overhead through a joint choice of transmit andreceive linear filters. We focus on assessing their resilience to uncoordinatedinterference and Channel State Information (CSI) imperfections, which bothseverely limit the performance gains of all CoMP schemes. We present a simpleyet encompassing system model that aims at incorporating different parametersof interest in the relative interference power and CSI errors, and then utilizeit for the performance evaluation of the state-of-the-art in CB schemes. It isshown that blindly applying CB in all system scenarios can indeed becounter-productive.

On the Robustness of Coordinated Beamforming to Uncoordinated Interference and CSI Uncertainty