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This paper focuses on energy-efficient coordinated multi-point (CoMP)downlink in multi-antenna multi-cell wireless communications systems. Weprovide an overview of transmit beamforming designs for various energyefficiency (EE) metrics including maximizing the overall network EE, sumweighted EE and fairness EE. Generally, an EE optimization problem is anonconvex program for which finding the globally optimal solutions requireshigh computational effort. Consequently, several low-complexity suboptimalapproaches have been proposed. Here we sum up the main concepts of the recentlyproposed algorithms based on the state-of-the-art successive convexapproximation (SCA) framework. Moreover, we discuss the application to thenewly posted EE problems including new EE metrics and power consumption models.Furthermore, distributed implementation developed based on alternatingdirection method of multipliers (ADMM) for the provided solutions is alsodiscussed. For the sake of completeness, we provide numerical comparison of theSCA based approaches and the conventional solutions developed based onparametric transformations (PTs). We also demonstrate the differences and rolesof different EE objectives and power consumption models.

Energy-Efficient Transmission Strategies for CoMP Downlink - Overview, Extension, and Numerical Comparison