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NB-IoT vs. LTE-M

Jari Haiston in Blogs on February 21, 2022

About Jari Haiston

Jari Haiston is part of the growing digital marketing team at Symmetry Electronics. Jari comes from a background in technical writing and event coordination. In her current role, she specializes in content creation and social media management. Jari's focus as a writer is to create interesting content that is accessible to any audience.
How-To-Determine-Whether-NB-IoT-Or-LTE-M-Is-The-Best-Protocol-For-Your-IoT-Device-Design

Narrowband Internet of Things (NB-IoT)

Already adopted in many parts of Europe and Asia, Narrowband IoT (NB-IoT) is a mobile data standard for low power wide area networks (LPWAN) that was developed by 3GPP. A 2019 Grand View Research report stated that the NB-IoT market is expected to reach $6.02 billion by 2025. With robust industry forecasts, it is clear that the list of applications incorporating NB-IoT is growing.

As a mobile data standard, lack of network availability has been an issue in generating momentum around NB-IoT connectivity. However, as of 2021, 120 companies have commercially deployed NB-IoT networks. NB-IoT technology is a sustainable choice of wireless communication standard as it reuses existing Global System for Mobile (GSM) carrier waves. However, with data rates up to 250 Kbps, NB-IoT technology is well suited for applications that use lower bandwidth that only wake periodically to provide data. NB-IoT technology is able to provide an extended battery life of 10+ years by utilizing Power Saving Mode (PSM) and extended Discontinuous Reception (eDRX).

Key Benefits of NB-IoT:

  • Extended battery life of 10+ years
  • Enhanced range
  • Advanced obstacle/barrier penetration
  • Low power consumption
  • Cost-effective
  • Simple radio design based on single carrier frequency division multiple access and DSSS modulation

NB-IoT Applications:

  • Smart agriculture
  • Smart streetlights
  • Waste management
  • Manufacturing automation
  • Smoke detectors

Figure 1: Comparison of LTE-M and NB-IoT technologies

Source: Digi International

Long Term Evolution for Machines

Long Term Evolution (4G), category M1, or LTE-M, is a low power wide area cellular technology that connects IoT devices directly to 4G networks. With the advantage of connecting directly to 4G networks, LTE-M technology is able to provide speed, low latency, and reliability. Like NB-IoT, LTE-M technology also utilizes PSM and eDRX, making LTE-M devices capable of similar enhanced coverage and long battery life that NB-IoT offers. Additionally, LTE-M is also a powerful asset in mobile use cases as it can switch between cell towers.

Key Benefits of LTE-M:

  • LTE-M is a more cost-efficient option than NB-IoT. The half-duplex chips used to connect LTE-M devices to 4G networks are less expensive than those used in NB-IoT.
  • LTE-M enabled devices also provide extended battery life as they also use PSM to wake periodically and provide data.
  • Services surrounding LTE-M cost less because data rates are variable.

LTE-M Applications:

  • Low-density sensors
  • Smart meters
  • Asset tracking
  • Smart cities
  • Smart healthcare

When it comes to deciding whether to incorporate NB-IoT or LTE-M into your device design (Figure 1), application and use case will be the ultimate deciding factors. While both provide approximately the same amount of extended battery life, NB-IoT technology is well suited for stationary remote devices that do not require high bandwidth or low latency. While NB-IoT’s range capabilities are advantageous, the technology is more expensive to implement than LTE-M. LTE-M is a cost-efficient, mobile data standard that provides lower latency and higher speeds that NB-IoT.

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Jari Haiston in Blogs on February 21, 2022

About Jari Haiston

Jari Haiston is part of the growing digital marketing team at Symmetry Electronics. Jari comes from a background in technical writing and event coordination. In her current role, she specializes in content creation and social media management. Jari's focus as a writer is to create interesting content that is accessible to any audience.

Why partner with Symmetry Electronics? Symmetry's technical staff is specially trained by our suppliers to provide a comprehensive level of technical support. Our in-house Applications Engineers provide free design services to help customers early in the design cycle, providing solutions to save them time, money and frustration. Contact Symmetry for more information.

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