Joint Subchannel Allocation and Power Control in OFDMA Femtocell Networks

In this paper, we investigate the problems of joint sub-channel allocation and power control in Orthogonal Frequency Division Multiple Access (OFDMA) based on two-tier networks. First, we propose the power control problem to minimize the transmission power of macrocell in half-duplex (HD) mode. Then we investigate the joint sub-channel allocation and power control problem to maximize the total throughput of femtocells in full-duplex (FD) mode, subject to constraint of quality-of-service of delay-sensitive users (DS) and constraint of co-tier, cross-tier and other interferences caused by full-duplex transmissions. Also, femtocells are able to switch between HD and FD modes. Finally, to solve these problems, we propose suboptimal and distributed algorithms for macrocell and femtocells. The simulation results demonstrate that the proposed algorithms improve the total throughput compared to existing algorithms.