Analysis of area spectral efficiency and energy efficiency based on RSS-threshold in Device-to-Device-communication

Abstract

Device-to-Device (D2D)-communication is a promising way to improve area spectral efficiency (ASE), energy efficiency (EE) and mitigate traffic load of base station (BS). In this paper, received signal strength (RSS)-threshold approach is presented to analyze ASE and EE of D2D users in cellular networks. A mobile user equipment (UE) will choose to work in cellular mode only if RSS from nearest BS is greater than a minimum threshold β. Otherwise, it will work in D2D mode and choose to be either transmitter or receiver. A system model is used to analyze the ASE where BSs and UEs are distributed using stochastic geometry. Multichannel environment (set of N channels) is considered with Rayleigh fading. We derive closed form expressions for ASE. EE is derived using basic definition. Numerical results show that ASE increases with RSS-threshold β and number of channels |N|, and decreases with Signal-to-Interference power ratio (SIR) threshold θ. Similar nature is shown by energy efficiency.