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Robust beam forming methods are studied to support relay-assisted Coordinated Multi-Point (CoMP) retransmissions in downlink multi-cell networks. Linear Beam-Formers (BFers) for relay stations of different cells are jointly designed to maintain, in a CoMP Amplify-and-Forward (AF) relaying manner, the target Signal to Interference-plus-Noise Ratios (SINR) at the cellular boundaries of this type of networks. Considering the feasibility in realizations, BFer designs are only allowed to use the Channel State Information (CSI) feedbacks of the wireless links inside a network.
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