Spatial constraints of device-to-device communications

Device-to-device (D2D) communication has recently been considered as an efficient way to offload the cellular traffic by allowing user equipments (UEs) to have direct communication via the licensed spectrum. In this paper, we study the fundamental constraints of maximally allowed density and communication distance of D2D devices. The locations of D2D devices are modeled by a Poisson point process (PPP) and the tools from stochastic geometry are applied for network analysis. Scenarios involving infinite and finite coverage area and exclusion region are investigated.