Abstract
In this paper, the performance of device-to-device (D2D) communications in cellular networks is studied when the downlink communication resources are reused. To guarantee the successful coexistence of multiple D2D pairs reusing the identical radio resource, the Power Emission Density (PED)-based interference modeling method is adopted to explore proper network settings. With the constraint of the Signal-to-Interference Ratio (SIR) requirements for both the macro-cell and D2D communications, an exclusive region-based analytical model is proposed to obtain the guard distances from a D2D user to the transmitting base station, to the receiving cellular user, and to other communicating D2D pairs, respectively. With these guard distances, the bounds of the throughput improvement provided by D2D communications are then derived for different cases. Finally, extensive simulations are conducted to verify our analytical results. The new results obtained in this work can provide useful guidelines for the deployment of future cellular networks with underlaying D2D communications.
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