Passive Loop Interference Suppression in Large-Scale Full-Duplex Cellular Networks

TL;DR

This paper models full-duplex cellular networks using stochastic geometry, showing how passive suppression of loop interference via antenna angles and directional antennas can enable large-scale FD deployment.

Contribution

It introduces a stochastic geometry model incorporating passive LI suppression based on antenna angles and demonstrates potential for large-scale FD cellular networks.

Findings

Passive suppression significantly reduces loop interference.

Directional antennas improve multiuser interference management.

FD can be feasible in large-scale networks with proper interference control.

Abstract

Loop interference (LI) in wireless communications, is a notion resulting from the full-duplex (FD) operation. In a large-scale network, FD also increases the multiuser interference due to the large number of active wireless links that exist. Hence, in order to realize the FD potentials, this interference needs to be restricted. This paper presents a stochastic geometry model of FD cellular networks where the users and base stations employ directional antennas. Based on previous experimental results, we model the passive suppression of the LI at each FD terminal as a function of the angle between the two antennas and show the significant gains that can be achieved by this method. Together with the reduction of multiuser interference resulting from antenna directionality, our model demonstrates that FD can potentially be implemented in large-scale directional networks.