Energy-Efficient Mode Selection for D2D Communication in SWIPT Systems

Abstract

To realized an energy-efficient mode selection, we apply simultaneous wireless information and power transfer (SWIPT) to D2D communications, so that D2D and cellular users can obtain energy from receiving information, and reduce the battery energy consumption in the communication process. We leverage the theory of stochastic geometry to analyze the ergodic energy harvesting (EEH) of D2D and cellular links in reuse, dedicated, and cellular communication modes. Based on the data transmission process, we obtain the expressions of the ergodic capacity (EC) of D2D and cellular users in three D2D communication modes with power splitting (PS) architectures of SWIPT, and based on this, we derive the system energy efficiency (EE). Finally, theoretical research is demonstrated through the simulation experiments. The mode selection mechanism is performed according to the energy-efficiency. The simulations show that the system EE is improved, especially for D2D communications in reuse mode by our proposed mode selection mechanism.