RF Energy Harvesting Dependency for Power Optimized Two-Way Relaying D2D Communication

Radio frequency (RF) Energy Harvesting (EH) plays an important role to deal with the energy efficiency (EE) shortage for wireless networks. On the other hand, relay nodes (RNs) can participate in device-to-device (D2D) communications to play a significant role in enhancing their performance. Also, they can exploit the RF EH while assisting the relay-aided D2D networks. This paper investigates the two-way relaying (TWR) D2D communication underlaying conventional cellular communication assuming the RF EH capabilities of the relays based on the power splitting (PS) protocol. Accordingly, the paper contributions are divided into two folds. First, it presents a power allocation (PA) model such that the TWR D2D link rate is maximized. The second and more important contribution is that the paper answers the contentious question of whether using RF EH in TWR D2D communication is worthwhile. The results depict the consistency of the PA model according to various parameters as well as the RF EH dependency for the participating relays.