A tractable model for Device-to-Device communication underlaying multi-cell cellular networks

It is well-established that Device-to-Device (D2D) communication is a promising technology to improve spectral efficiency and reduce system power consumption simultaneously. In this paper, we build a tractable model for Device-to-Device communication underlaying multi-cell cellular networks to evaluate the coverage probability and area spectral efficiency by utilizing stochastic geometry. To mitigate the interference in this hybrid system, we adopt Exclusion Regions (ERs) around base stations to limit the locations of cellular users and active D2D users. Numerical results demonstrate that ERs could significantly improve the coverage probability and the system area spectral efficiency. Our results also show that the coverage probability target can still be achieved for the maximum allowed D2D communication distance or the maximum D2D pairs density by adjusting the ER radius.