A Study of Interference Distributions in Millimeter Wave Cellular Networks

TL;DR

This paper analyzes how interference power distributions in millimeter wave cellular networks are affected by beamforming and user association schemes, revealing significant impacts on network performance and interference characteristics.

Contribution

It provides a detailed analysis of interference distributions in mmWave networks with beamforming, contrasting them with omnidirectional transmission and highlighting the effects of user association.

Findings

Beamforming reduces strong interference and enhances throughput.

User association schemes significantly alter interference and throughput.

Numerical results confirm the impact of transmission techniques on interference structure.

Abstract

We study the distribution of the interference power in a millimeter wave (mmWave) cellular network. Such interference is random and highly dependent on the employed transmission technique, as well as the varying channel conditions and the varying association between users and base stations. Traditional networks at lower frequencies usually employ omnidirectional transmission which creates an (almost) equal amount of interference in any direction. MmWave networks, however, must employ directional beamforming transmission in order to compensate for the high path loss in mmWave frequency bands. These directional transmissions drastically change the network interference structure. We examine the interference power distributions in an mmWave network employing beamforming transmission under different user association schemes, and contrast with those under omnidirectional transmission. Numerical results using an analytical mmWave channel model and a measurement-based channel generator, NYUSIM, show that beamforming not only reduces the amount of strong interference and hence significantly enhances network throughput, but also user association can considerably alter network interference and throughput structures.