Low Power Wide Area Networks: An Overview

TL;DR

This paper provides a comprehensive overview of Low Power Wide Area networks, highlighting their design goals, technologies, standardization efforts, challenges, and future research directions for IoT connectivity.

Contribution

It surveys emerging LPWA technologies, standardization activities, and discusses common limitations, offering insights into future research challenges and opportunities.

Findings

LPWA technologies enable wide-area, low-power IoT connectivity.

Standardization efforts are ongoing across multiple organizations.

LPWA faces shared limitations and challenges that require further research.

Abstract

Low Power Wide Area (LPWA) networks are attracting a lot of attention primarily because of their ability to offer affordable connectivity to the low-power devices distributed over very large geographical areas. In realizing the vision of the Internet of Things (IoT), LPWA technologies complement and sometimes supersede the conventional cellular and short range wireless technologies in performance for various emerging smart city and machine-to-machine (M2M) applications. This review paper presents the design goals and the techniques, which different LPWA technologies exploit to offer wide-area coverage to low-power devices at the expense of low data rates. We survey several emerging LPWA technologies and the standardization activities carried out by different standards development organizations (e.g., IEEE, IETF, 3GPP, ETSI) as well as the industrial consortia built around individual LPWA technologies (e.g., LORa Alliance,WEIGHTLESS-SIG, and DASH7 Alliance). We further note that LPWA technologies adopt similar approaches, thus sharing similar limitations and challenges. This paper expands on these research challenges and identifies potential directions to address them. While the proprietary LPWA technologies are already hitting the market with large nationwide roll-outs, this paper encourages an active engagement of the research community in solving problems that will shape the connectivity of tens of billions of devices in the next decade.