Sum-Rate Maximization with Joint Power Allocation and Mode Selection in D2D-Enabled 5G Cellular Networks

Abstract

Device-to-Device (D2D) communication is a potential candidate which satisfies the fundamental requirements of the upcoming 5th generation (5G) technology. In underlay D2D communication, the cell sum-rate of the system increases but it also induces interference to the primary cellular users which may degrade the performance of the system. This paper proposes a scheme to mitigate the interference generated by the D2D user equipment (DUE) to the cellular user equipment (CUE) with the help of power control of DUE, and also by selecting proper mode of operation. DUE's mode of operation is selected on the basis of channel gain threshold. DUEs power is controlled such that the interference generated by DUEs is within the certain limits and CUEs performance does not degrade below the certain threshold. Performance of the scheme is simulated in the mobile and wireless communication enablers for twenty-twenty information society (METIS-2020), International Telecommunication Union Radiocommunication Sector (ITU-R) and WINNER-II channel environments. Instantaneous channel gains and receiver sensitivity are assumed to be known to the enhanced Node-B (eNB) for simulation. Simulation results show that cell sum-rate of the system increases by a factor of 32 when DUEs are in dedicated mode and by a factor of 6, when DUEs are in reuse mode, by allowing underlaying D2D communication at the cost of interference to the primary users.