On the optimization of mobile power-controlled cellular networks regarding practical limitations

In this paper, the intra-cell link adaptation problem is formulated as a constrained nonconvex nondifferentiable optimization problem to maximize the average link throughput while guaranteeing the best possible coverage reliability. We proceed to solve the resulted nonsmooth optimization problem using proximal point bundle method known in nondifferentiable optimization context. For this purpose, we first exploit the problem structure and reduce the original large scale optimization problem to a sequence of one-dimensional problems coordinated by a master program using direct primal decomposition technique. Proximal bundle method with aggregation policy is then adopted in master program to solve the so called dual problem, with subdifferential information already collected from each subproblem. Performance of our method: adaptive modulation/coding with power management (AMCWPM) using proposed algorithm is compared with that of an adaptive modulation/coding (AMC) with no power management. Simulation results show that the proposed method improves both the average link throughput and coverage reliability by more than 20% while in each case the other parameter (i.e. respectively, coverage reliability and average link throughput ) is hold as much as that of AMC.