Analysis of Energy Efficiency and Area Spectral Efficiency in small cell networks with multi-antenna Base Stations

In this paper we study a dense small cell network employing multi-antenna Base Station (BS)s and analyse the two performance metrics, the Energy Efficiency (EE) and the Area Spectral Efficiency (ASE). In this network each BS utilizes the Frequency Reuse (FR) to mitigate the interference of the other BSs. Although the two network parameters, the BS density and the number of its antennas change the both EE and ASE, EE becomes an important metric as these parameters substantially increase. Applying the spatial Poisson Point Process (PPP) model for the distribution of the BSs and the User Equipment (UE)s, we demonstrate that there exists a trade-off between EE and ASE. Therefore, we aim to maximize EE of the networks given a constraint on ASE to derive the optimal network parameters. Some simulation examples justify our derivations.