Distributed Power Control for Energy Saving in Device-to-Device Communication Underlaying Cellular Network from Game Perspective

Device-to-Device (D2D) communication is proposed as a promising remedy to improve the quality-of-service (QoS) for communicating user equipments (UEs) in proximity by reusing the spectrum of cellular system. Meanwhile, energy conservation receives great attention for D2D UEs owing to the battery-driven feature and undesirable cross-tier interference. So, we leverage about performance tradeoff and attempt to minimize the power consumption for D2D communication via distributed power control (DPC). We apply non-cooperative game with pricing among D2D players in their pursuit of QoS requirements. Under any pricing, the existence and uniqueness of Nash Equilibrium (NE) are verified, and the convergence of the power updating is also proved. Besides, we adjust the price value to maintain the QoS requirement for primary cellular UE. Specifically, a novel user removal scheme is introduced to softly remove the players in unfavorable condition by setting a low QoS target when feasibility can´t be guaranteed. Finally, we elucidate the efficacy of our scheme in terms of aggregate power consumption and system capacity (SC), i.e., The number of admitted D-links, which shows the necessity and superiority of our performance tradeoff.