  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.
