A low-power wide-area network (LPWAN) is a type of wireless network designed to carry small amounts of data over long distances, from devices that need to run for years on a battery. It trades speed for range and battery life: an LPWAN device might send a few bytes several times a day from a basement meter, a field sensor or a shipping container, where Wi-Fi does not reach and a standard cellular connection would drain the battery or cost too much. LPWAN is a category, not a single technology; it covers options that run on unlicensed spectrum, such as LoRaWAN, and options delivered by mobile operators, such as NB-IoT and LTE-M.
At a glance
- LPWAN is a category of networks for small, infrequent messages over long range at low power.
- Battery life can reach several years, depending on reporting frequency, coverage and battery size.
- Unlicensed options such as LoRaWAN can be private or public; NB-IoT and LTE-M run on mobile operators’ licensed networks.
- Data rates are low, so LPWAN suits sensors, meters and trackers, not video.
- Frequency bands, operator support and coverage vary by country.
What problem it solves
Many Internet of Things (IoT) devices only need to report a reading, an alarm or a location now and then, but they are spread across large or awkward areas: farms, utility networks, campuses, parking structures, cold-storage rooms, pipelines and supply chains. Wi-Fi and Bluetooth don’t reach far enough, wiring is impractical, and regular cellular modules use too much power and can be expensive per device.
LPWAN technologies are designed for exactly that profile. A single gateway or cell site can cover a wide area, devices sleep most of the time to save battery, and connectivity costs per device are generally lower than for standard cellular data. That makes it practical to deploy thousands of inexpensive sensors and leave them in place for years.
How it works
Unlicensed LPWAN. LoRaWAN is the most widely used example. Devices send short messages to gateways, which forward them over the internet to a network server and then to the application. You can build a private network with your own gateways, use a public network operator’s coverage, or combine both. Unlicensed bands differ by region, so devices and gateways come in regional versions, and duty-cycle or power rules depend on local regulations. Other proprietary unlicensed networks exist too, with availability depending on the operator.
Cellular LPWAN. NB-IoT (Narrowband IoT) and LTE-M (LTE for machines) are standards from the same body that defines LTE and 5G, deployed by mobile operators on licensed spectrum. Devices use a SIM or eSIM and a data plan. LTE-M supports more data, mobility and limited voice; NB-IoT targets very low data rates and deep indoor coverage. Support for each varies by operator and country.
Power saving. Devices spend most of their time asleep and wake to send data or check for messages. Choices about how often they report, and how often they can receive commands, have a large effect on battery life.
Application. Messages reach a platform that stores readings, triggers alerts and feeds dashboards or business systems.
Our Internet of Things solution page covers how to choose connectivity for sensor and tracking projects.
When it matters for buyers
- Large or remote sites. Agriculture, utilities, property portfolios, campuses and logistics yards.
- Battery-powered sensors. Where battery replacement visits are the main cost, power efficiency matters most.
- Many low-value devices. Connectivity cost per device can decide whether a project pays back.
- Multi-country deployments. Regional bands and operator support affect device choice and roaming.
- Planning for network retirements. Older 2G and 3G networks have been switched off in many countries, and devices moving off them often move to LTE-M or NB-IoT.
Questions to ask vendors
- Which LPWAN technology do you recommend for our use, and why not the others?
- What coverage do you have at each of our sites, including indoors and underground, and can we test it?
- Is the network private, public or a mix, and who operates the gateways?
- What battery life should we expect at our reporting interval and coverage levels?
- Which countries and operators support these devices, and how is roaming handled?
- How are devices updated over the air, and how is data secured end to end?
- What does connectivity cost per device per year, and what are the contract terms?
How it differs from LTE
LTE is the 4G cellular standard that carries phone and broadband data at high speeds. LPWAN is a category of networks built for the opposite job: very small amounts of data at low power over long range. Two cellular LPWAN technologies, LTE-M and NB-IoT, are defined within the same family of standards as LTE and run on operators’ networks, but they cut speed and features to extend battery life and coverage. Standard LTE suits devices that need bandwidth, such as routers and cameras; LPWAN suits sensors and meters.