Outage probability of heterogeneous cellular networks with full-duplex small cells

Abstract

Full-duplex (FD) small cells provide a promising solution for meeting the sought requirements of future wireless networks, specifically, the capacity, coverage and spectral efficiency. Motivated by the recent developments in self-interference (SI) cancellation techniques, the main objective of this paper is to further investigate the impact of using fully FD- capable small cells on conventional HetNets. We analyse a two-tier heterogeneous cellular networks (HetNets), wherein tier 1 consists of legacy half-duplex (HD) macro base stations (BSs) while tier 2 consists of FD small cells. Based on the stochastic geometry approach, we develop a theoretical model and derive closed-form expressions for the outage probability of downlink macrocell users, in addition to downlink and uplink users of small cells since they operate in FD mode. Analytical and simulation results are provided to verify the derived expressions and evaluate the variation of different parameters on the network performance.