NB-IoT or LoRaWAN for Water Metering: Licensed Spectrum Versus Long-Term Cost

For utilities specifying smart water meters, the connectivity decision usually comes down to NB-IoT against LoRaWAN, and the distinction is described in operational rather than technical terms: NB-IoT runs on licensed spectrum operated by mobile carriers and is often better for dispersed meters and deep indoor locations, while LoRaWAN uses unlicensed spectrum and can offer lower long-term operating cost in dense deployments.

That framing is more useful than a specification comparison because it identifies what actually varies. Licensed spectrum means somebody else guarantees coverage and charges per device for it. Unlicensed spectrum means you build and own the gateways, pay no subscription, and accept that interference is your problem. Neither is better in the abstract; they differ in who carries which risk.

Density is the variable that decides it in practice. A gateway has a fixed cost regardless of how many meters report through it, so a dense urban rollout amortises that cost across thousands of devices and the per-meter economics favour LoRaWAN sharply. Scatter the same number of meters across a rural region and the gateway count rises toward the point where a carrier's existing coverage is simply cheaper than replicating it. Deep indoor placement — meters in pits and basements — cuts the other way again, and is the case where a site survey earns its cost rather than a coverage map.