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Cellular technologies for IoT
When to choose what
Key takeaways
Start with mobility.
If the device moves, NB-IoT is eliminated. If it is stationary, NB-IoT is a strong contender.
Then evaluate throughput.
Small sensor payloads work with any LPWA technology. Firmware updates need LTE-M. Video and gateways need 4G LTE or 5G RedCap.
Battery life constrains your options
Multi-year battery operation requires NB-IoT or LTE-M. If you have reliable power, prioritize throughput and capability instead.
Geography matters.
LTE-M dominates North America, NB-IoT dominates China, Europe supports both. Plan for your target markets, not just your test lab.
Dual-mode with eSIM is the safe default.
For new designs with uncertain or global deployment requirements, a dual-mode LTE-M/NB-IoT module with eSIM provides maximum flexibility and future-proofing.
Satellite fills the final gaps
Hybrid cellular-satellite modules eliminate dead zones for assets that traverse areas without terrestrial coverage, at the cost of higher per-byte pricing and lower throughput.
What you'll learn
How to use mobility as the first decision criterion
The single most important question is: does the device move? If it moves, whether in a vehicle, on a person, attached to a shipping container, or mounted on a drone, you need a technology that supports handover between cell towers. NB-IoT does not support handover, so it is eliminated for any mobile application. Your options narrow to LTE-M, standard 4G LTE, or 5G RedCap. If the device is stationary (permanently installed in a building, mounted on a utility pole, buried underground) NB-IoT becomes a strong contender alongside LTE-M.
How throughput requirements narrow the technology choice
For most IoT sensor data, including temperature readings, GPS coordinates, meter values, and status updates, payloads are small (tens to hundreds of bytes), and both NB-IoT and LTE-M handle this easily. If the device needs to send images, audio, or support regular firmware over-the-air updates, you need at least LTE-M's approximately 1 Mbps capability. If the device streams video, runs rich applications, or acts as a data aggregation gateway, you need 4G LTE or 5G RedCap.
How battery life constraints determine viable technologies
If the device must operate for 5–10+ years on a battery, NB-IoT is the strongest option, followed by LTE-M. Both support PSM and eDRX for deep sleep modes. Standard 4G LTE is not viable for battery-powered devices. 5G RedCap supports power-saving modes but currently cannot match NB-IoT's multi-year battery life. If the device has a reliable power source (mains power, solar with storage, vehicle battery), throughput and capability become more important than power efficiency.
How deployment environment and geography influence the decision
Deep indoor or underground deployments (basements, parking structures, utility vaults) favor NB-IoT's superior coverage penetration. Outdoor or shallow indoor deployments work with any technology. Geography matters because carrier support varies by region: LTE-M is the safest bet in North America, NB-IoT dominates China, and Europe supports both. For global deployments, a dual-mode LTE-M/NB-IoT module with eSIM provides the most flexibility.
How to apply the decision framework to common IoT use cases
A shipping container tracker needs mobility and multi-year battery life making LTE-M is the consistent choice. An underground parking sensor is stationary with minimal data and needs to last years. NB-IoT wins here with its deep penetration. An industrial security camera is mains-powered and data-heavy is great for 4G LTE or 5G RedCap. A personal emergency response device needs mobility plus voice? Think LTE-M with VoLTE. For projects where requirements fall between categories, a dual-mode LTE-M/NB-IoT module with eSIM is the industry standard for future-proofing hardware.
Where satellite connectivity fits as a complement to cellular IoT
Satellite connectivity acts as a safety net for IoT deployments in areas without terrestrial cellular coverage. Modern IoT modules can house both cellular and satellite radios in a single package. Connecting to cellular when a tower is available (faster, cheaper) and switching to satellite when cellular drops (ocean, remote mining sites, mountain ranges). The tradeoffs: satellite provides universal coverage but at higher data cost, lower throughput, and requires line-of-sight to the sky (it will not work in deep indoor environments where NB-IoT succeeds). Satellite is the perfect partner for cellular, not a replacement. Together they eliminate dead zones for logistics fleets and remote agricultural sensors.
Lesson 1.6 Self-assessment
1. What is the first question in the technology decision framework?
2. According to the reference matrix, which technology best fits a stationary underground parking sensor?
3. What is the recommended way to future-proof a new cellular IoT design when requirements are uncertain?
Frequently asked questions
Cellular network architecture and radio fundamentals
Go under the hood of the cellular network. Understand how data moves from the radio tower through the core network to the internet. Mastering these architectural fundamentals is the key to building truly robust and reliable IoT products.
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