What is the difference between 4G LTE-M and NB-IoT?

4G LTE-M and NB-IoT are both cellular technologies designed specifically for connecting IoT (Internet of Things) devices like sensors. They are essentially low-power, long-range versions of the 4G network you use on your smartphone.

While they serve a similar purpose, they have some key differences that make them suitable for different situations.

Key Differences Between LTE-M and NB-IoT

The main distinction between the two technologies comes down to speed versus power efficiency.

• LTE-M (Long Term Evolution for Machines):
  • Speed: It's the faster of the two. It can handle more data at a time, which makes it ideal for devices that need to send or receive slightly larger messages.
  • Mobility: It supports mobility, meaning a device can maintain a connection even when it's moving from one cell tower to another.
  • Best for: Applications that need a balance of speed and power efficiency, such as asset tracking or devices that send more frequent data.
• NB-IoT (Narrowband Internet of Things):
  • Power: It is the more power-efficient technology. Its narrow bandwidth allows devices to run for many years on a single battery charge.
  • Speed: It is slower and can only handle very small, infrequent data packets.
  • Mobility: It is not designed to support moving devices.
  • Best for: Stationary devices that only need to send small, simple updates, such as a smart water meter reading.

How Dryad Uses Both Technologies

The Silvanet Border Gateway acts as a bridge between the local LoRaWAN sensor network and the internet. To ensure the highest level of reliability, Dryad Border Gateways are configured to use either NB-IoT or 4G LTE-M and 2G (GPRS) fallback.

This flexibility allows the system to adapt to different cellular conditions on a deployment site:

• If the site has very weak cellular coverage, the highly efficient NB-IoT can often establish and maintain a connection where other technologies might fail.
• If the site has a stronger signal, 4G LTE-M can be used to provide a more robust and faster connection for the gateway.

• Border Gateway supports both LTE-M and NB-IoT, switching automatically depending on your SIM card capabilities and network availability.

Before deployment, check with your network provider to confirm which technology and frequency bands are available in your area for the best performance.