Region Division Based Spectrum Access of D2D Communication under Heterogeneous Networks

This paper analyzes a spectrum access scheme based on region division for Device-to-Device (D2D) communication underlaying cellular networks with outage constraint for cellular communication. The D2D pairs will access the spectrum by sharing the cellular uplink (UL) frequency resources in the networks. By utilizing stochastic geometry, D2D accessing the frequency spectrum can be modeled as the probability that the cellular user (CeUE) SINR is below an appropriate threshold. And the constraint of the probability appears as a transcendental equality, so we figure out the solution with the help of Lambert W function and obtain the closed-form solution of the region division in the whole cell when the cellular location are determined. Then in the simulation, we analyze the relationship between system capacity and key parameters including the CeUE location, the D2D density and D2D output power in detail. The results show that the proposed scheme can make the D2D pairs access the frequency spectrum in the networks effectively.