Power-Spectrum Trading for Full-Duplex D2D Communications

Device-to-device (D2D) communications has been considered as a promising technique that enables adjacent mobile terminals to transmit point-to-point data directly without going through base stations. Since two-way data exchanging is common in practical D2D communications scenarios, full-duplex (FD) communications can be exploited to improve the performance of D2D communications. Therefore, to a certain extent, efficient resource allocation to avoid severe self-interference of FD communications and the interference between D2D users (DUs) and cellular users (CUs) is critical to fully realize the potential benefit of FD-enabled D2D communications. In this paper, we investigate the resource allocation for a FD D2D pair coexisting with a cell-edge CU. By exploiting the asymmetry of spectrum and energy resources between the DU and CU, we propose a spectrum and energy trading method to achieve the mutual benefits of both users. Concave-convex procedure (CCCP) algorithm is adopted to solve the optimization problem. Simulation results show that the proposed method can significantly improve the system performance.