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In this paper, the problem of rate control in multiuser Multiple-Input Multiple-Output (MIMO) interference systems is formulated as a Multi-Criteria Optimization (MCO) problem. The Pareto rate region of the MCO problem is first characterized by giving a sufficient condition for the convexity of the Pareto rate region. Second, various rate region convexification approaches including a multistage interference cancellation and a Full Projection (FP)-based interference avoidance scheme are analyzed. An achievable rate region based on FP is also given for MIMO interference systems. Third, Nash Bargaining (NB) is applied to transform the MCO problem into a single-objective problem.
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