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This paper proposes a distributed power control framework for wireless communication networks that is able to provide a flexible QoS with the introduction of a dynamic target QoS into a conventional (fixed) target tracking power control algorithm. The target QoS of individual terminals is automatically updated according to a given performance criterion. The distributed power control is formulated as a linear quadratic regulator (LQR) problem, where system operating points are met according to channel quality and the choice of key parameters. Effectiveness of the LQR-based power control is analyzed and the influence of such parameters on the algorithm's performance is investigated with the help of computer experiments.