Fairness based Power Allocation Optimization in Dense Full Duplex D2D Networks

In 5th generation (5G) communication, the dense D2D network is a part of the ultra dense network. The features of short transmission distance and low transmission power of device-to-device (D2D) communication make it excellent to integrate the full duplex (FD) and D2D techniques for higher spectrum efficiency. In this paper, we consider the scenario of dense FD D2D network, in which the co-channel FD D2D pairs will interfere with each other. In such dense FD D2D network, fairness is an important factor for evaluating the network performance. In this paper, our objective is to optimize the data rate's fairness of co-channel FD D2D pairs in the network through power control, meanwhile protect the minimum achievable signal to interference plus noise ratio (SINR) of the cellular user. We first formulate the fairness optimization problem, which is a non-convex problem. Then we exploit the difference of two convex functions/sets (d.c.) structure of the utility function to search the transmission powers' global optimal iteratively. Simulation results show that the proposed algorithm is superior to the previous-proposed methods on data rate's fairness.