Figure 7

Convergence for the transmit power of FBSs by using ADMM-based distributed method. The evolution of the transmission power of all FUEs in the first femtocell block is presented, where$I_m^t=10N_0$, ε _m  = 0.5, and ζ _i  = 0.5. All transmit powers of FBSs converge to the limited values within 10 steps, so ADMM-based distributed method converges fast and can adapt to the variation of network situations.