# Optimum LoRaWAN Configuration Under Wi-SUN Interference

## TL;DR

This paper develops an analytic model and optimization algorithms for configuring LoRaWAN networks to maximize performance under Wi-SUN interference, ensuring minimum reliability in shared unlicensed bands.

## Contribution

It introduces a novel interference-aware model for LoRaWAN, deriving closed-form reliability equations and proposing algorithms for optimal network configuration under interference constraints.

## Key findings

- Validated models with real measurement data.
- Algorithms effectively optimize range and user capacity.
- Reliable network configurations achieved in simulations.

## Abstract

Smart Utility Networks (SUN) rely on the Wireless-SUN (Wi-SUN) specification for years. Recently practitioners and researchers have considered Low-Power Wide-Area Networks (LPWAN) like LoRaWAN for SUN applications. With distinct technologies deployed in the same area and sharing unlicensed bands, one can expect these networks to interfere with one another. This paper builds over a LoRaWAN model to optimize network parameters while accounting for inter-technology interference. Our analytic model accounts for the interference LoRaWAN receives from IEEE 802.15.4g networks, which forms the bottom layers of Wi-SUN systems. We derive closed-form equations for the expected reliability of LoRaWAN in such scenarios. We set the model parameters with data from real measurements of the interplay among the technologies. Finally, we propose two optimization algorithms to determine the best LoRaWAN configurations, given a targeted minimum reliability level. The algorithms maximize either communication range or the number of users given constraints on the minimum number of users, minimum communication range, and minimum reliability. We validate the models and algorithms through numerical analysis and simulations. The proposed methods are useful tools for planning interference-limited networks with requirements of minimum reliability.