Analysis of Intelligent Vehicular Relaying in Urban 5G+ Millimeter-Wave Cellular Deployments

TL;DR

This paper develops a mathematical framework for the performance evaluation of mmWave vehicular relaying in a typical street deployment and analyzes and compares alternative connectivity strategies by quantifying the performance gains made available to smart devices in the presence of mm Wave relays.

Abstract

The capability of smarter networked devices to dynamically select appropriate radio connectivity options is especially important in the emerging millimeter-wave (mmWave) systems to mitigate abrupt link blockage in complex environments. To enrich the levels of diversity, mobile mmWave relays can be employed for improved connection reliability. These are considered by 3GPP for on-demand densification on top of the static mmWave infrastructure. However, performance dynamics of mobile mmWave relaying is not nearly well explored, especially in realistic conditions, such as urban vehicular scenarios. In this paper, we develop a mathematical framework for the performance evaluation of mmWave vehicular relaying in a typical street deployment. We analyze and compare alternative connectivity strategies by quantifying the performance gains made available to smart devices in the presence of mmWave relays. We identify situations where the use of mmWave vehicular relaying is particularly beneficial. Our methodology and results can support further standardization and deployment of mmWave relaying in more intelligent 5G+ "all-mmWave" cellular networks.

Figures (8)

• Figure 1: Our considered urban street deployment for mmWave vehicular relaying with the regular placement of static mmWave APs, random locations of pedestrians, cars, and buses. A fraction $p_{\text{R}}$ of cars are also equipped with mmWave relaying capabilities and can forward traffic between UEs and mmWave APs.
• Figure 2: Human-body blockage modeling.
• Figure 3: Minimal height of a bus resulting in vehicle-body blockage.
• Figure 4: Minimal height of a bus leading to blockage of COW-AP link.
• Figure 5: Mean SE decreases with the growing density of human-body blockers. A close match between the analytical and simulation-based results is observed.