LTE-M Technology Solutions

What is LTE-M?

LTE-M, also known as LTE Cat-M1, is a 3GPP cellular standard designed specifically for the Internet of Things and runs on operators' existing LTE networks. It uses a narrow 1.4 MHz bandwidth, achieves data rates of up to around 1 Mbit/s and supports power-saving modes such as PSM and eDRX. Unlike NB-IoT, LTE-M supports seamless handover between cells, short response times and in some cases even voice. This makes LTE-M the cellular IoT technology for devices that move or exchange more data.

How LTE-M is used in the IIoT

Classic applications are trackers on vehicles, trailers, containers, returnable load carriers and construction machinery that report their position and status across countries. Others include devices that must receive commands and confirm them promptly, such as remotely controlled switching actuators, charging points or alarm systems, and wearables for lone worker protection. Because LTE-M has enough bandwidth for over-the-air firmware updates, it also suits devices that must stay secure and up to date in the field for many years. LTE-M is also an obvious successor for IoT devices that currently use 2G.

How an LTE-M solution is structured

The device consists of an LTE-M module, often combined with NB-IoT and GNSS for positioning, a microcontroller, sensors, battery and a SIM card or eSIM. Data travels over a mobile operator's network to an IoT platform, usually via MQTT, CoAP or HTTPS. For devices used internationally, IoT SIMs with roaming agreements in many countries are used, managed through the connectivity provider's portal.

LTE-M or NB-IoT?

NB-IoT is even more power-efficient and penetrates buildings more deeply, but is mainly suited to stationary devices with little data. LTE-M is the better choice for mobile devices, shorter response times, bidirectional communication and firmware updates. In practice, many modules support both standards and choose whichever network is available on site, which considerably improves coverage.

What to consider when choosing

First clarify in which countries the devices will operate, because LTE-M roaming and support for power-saving modes differ between networks. Then consider the tariff model, battery capacity relative to transmission interval, and whether the module also supports NB-IoT and 2G as a fallback. For trackers it also matters how often the position is determined, since GNSS often uses more energy than the radio transmission itself.