Channel Allocation and Power Control in D2D Uplink Underlaid Cellular Networks

Abstract

In this paper, we consider the problem of maximizing the weighted sum rate (WSR) of device-to-device (D2D) pairs while guaranteeing the minimum throughput of cellular links in a D2D underlaid cellular network. To increase spectral efficiency, D2D users (DUs) are allowed to reuse all the uplink cellular subchannels. A novel iterative algorithm is proposed, which consists of solving two subproblems: the channel allocation and power control problem for cellular users (CUs) and the power control problem for DUs. We first model the former subproblem by an assignment problem and propose an algorithm to obtain the optimal solution with low complexity. Then, we apply the weighted minimum-mean- square-error (WMMSE) algorithm to solve the latter subproblem. By iteratively solving these two subproblems, the WSR of DUs converges to a suboptimal solution. Simulation results show that the proposed algorithm converges rapidly and outperforms the existing algorithm significantly in terms of the WSR of DUs.