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LTE-M vs NB-IoT: choosing the right radio for your IoT device

LTE-M and NB-IoT are both low-power networks for IoT, but they suit different devices. Here is how they compare on mobility, data, battery life and coverage.

If you are building a battery-powered or low-data device, you will meet two acronyms early on: LTE-M and NB-IoT. Both are low-power wide-area (LPWA) cellular technologies designed for IoT. Both run on licensed mobile spectrum. But they are built for different jobs, and picking the wrong one is an expensive mistake to fix after deployment.

The short version

  • Choose LTE-M for devices that move, need more data, need lower latency or may need voice.
  • Choose NB-IoT for stationary devices that send small amounts of data, need deep indoor coverage and must last for years on a battery.
  • Choose 4G or 5G when the device needs real bandwidth, such as video, routers or frequent large uploads.

LTE-M

LTE-M (also called LTE Cat-M1) is a cut-down version of 4G built for IoT.

  • Mobility. Supports handover between cells, so it suits trackers, vehicles and wearables.
  • Throughput. Higher than NB-IoT, enough for firmware updates and regular reporting.
  • Latency. Lower, so it suits devices that need a quick response.
  • Voice. Can support voice, which matters for alarms and wearables.

NB-IoT

NB-IoT (narrowband IoT) uses a very narrow slice of spectrum.

  • Coverage. Very good penetration into basements, meter cupboards and underground spaces.
  • Power. Excellent battery life for devices that wake, send a small message and sleep.
  • Data. Low throughput, best for small, infrequent messages.
  • Mobility. Built for devices that stay put.

Power saving on both

Both technologies support power-saving features that let a device sleep for long periods and wake only when it needs to send or receive. Used well, these features are what make multi-year battery life possible.

Coverage is the deciding factor

The best radio on paper is useless if it is not available where your devices are. LTE-M and NB-IoT availability varies by country and by operator, so check coverage in every market before you commit. Many modules support both, plus 4G as a fallback, which keeps your options open.

How to decide

  1. Does the device move? If yes, lean LTE-M.
  2. Is it deep indoors or underground? If yes, consider NB-IoT.
  3. How much data does it send, and how often?
  4. Does it need voice?
  5. Which radios are available in every country you ship to?

Our guide to choosing a radio covers the trade-offs in more detail, and the Simsonic connectivity page shows the networks Simsonic supports, including LTE-M, NB-IoT, 4G and 5G.

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