Device-to-Device(D2D) communication has been proposed as a promising implementation of green communication to benefit the existed cellular network.In order to limit cross-tier interference while explore the gain of short-range communication,we devise a series of distributed power control(DPC) schemes for energy conservation(EC)and enhancement of radio resource utilization in the hybrid system.Firstly,a constrained opportunistic power control model is built up to take advantage of the interference avoidance methodology in the presence of service requirement and power constraint.Then,biasing scheme and admission control are added to evade ineffective power consumption and maintain the feasibility of the system.Upon feasibility,a non-cooperative game is further formulated to exploit the profit in EC with minor influence on spectral efficiency(SE).The convergence of the DPC schemes is validated and their performance is confirmed via simulation results. Device-to-Device (D2D) communication has been proposed as a promising implementation of green communication to benefit the existed cellular network. Order to limit cross-tier interference while exploring the gain of short-range communication, we devise a series of distributed power control (DPC) schemes for energy conservation (EC) and enhancement of radio resource utilization in the hybrid system. Firstly, a constrained opportunistic power control model is built up to take advantage of the interference avoidance methodology constraint.Then, biasing scheme and admission control were added to evade ineffective power consumption and maintain the feasibility of the system.Upon feasibility, a non-cooperative game is further formulated to exploit the profit in EC with minor influence on spectral efficiency (SE) The convergence of the DPC schemes is validated and their performance is confirmed via simulation results.