Generalized Analysis and Optimization of D2D Communications in Cellular Networks

This paper develops an innovative approach to the modeling and analysis of downlink cellular networks with deviceto-device (D2D) transmissions. The analytical embodiment of the signal-to-noise and-interference ratio (SINR) analysis in general fading channels is unified due to the H-transform theory, a taxonomy never considered before in stochastic geometry-based cellular network modeling and analysis. Whereas ubiquitous results for coverage probability have a double integral, ones derived here for D2D and cellular coverage have compact or even closed forms, while subsuming those previously presented for all the known simple and composite fading models. By harnessing its tractability, the developed statistical machinery is employed to launch an investigation into the optimal design of coexisting D2D and cellular communications. We propose novel coverage-aware power control combined with opportunistic access control to maximize the area spectral efficiency (ASE) of D2D communications. Simulation results substantiate performance gains achieved by the proposed optimization framework in terms of cellular communication coverage probability, average D2D transmit power, and the ASE of D2D communications under different fading models and linkand network-level dynamics.