How Wi-Fi HaLow Extends Range and Reliability for IoT Data Streams

In a rapidly evolving and highly competitive environment, Internet of Things (IoT) developers must answer some important questions: How much data will my device need to send and receive? How long should the battery last? How far from a gateway can it reside? How many devices can I get on a single network? How easy is it to set up and secure?

The answers to these questions determine the connectivity protocol, and in cases where range and moderate data throughput are important, Wi-Fi HaLow offers a balanced solution.

The evolving needs of IoT networks

Whether it’s asset tracking or anything “smart,” such as agricultural sensing, lighting, or metering, wireless IoT workloads have one thing in common: the individual end nodes drip-feed raw data to cloud platforms for analysis and control. While useful for gathering insights across large networks, the devices themselves are often relatively simple. With limited on-board resources, it’s the cloud that does most of the thinking in these applications.

Let’s contrast this with emerging wireless edge applications that offer local data analysis and on-device decision making. Industrial predictive maintenance is a good example. Here, a sensor node detects a change in machine characteristics or performance outside a predefined range and sends a notification to the cloud, rather than continuously transmitting data for in-cloud analysis. Understandably, this saves limited network bandwidth for more important insights.

Nevertheless, sometimes raw or compressed data is best streamed in real time, such as for low-bit-rate security camera networks or smart building infrastructure, where control is as important as reporting. Here, long-range, low-power wireless access network (LPWAN) protocols might not be suitable, since they were primarily designed for small data packets and sparse reporting. While standard Wi-Fi offers high data rates, its range and power requirements can limit deployment options for battery-powered devices. Developers, therefore, benefit from wireless protocols that offer a compromise between the two. This is where Wi-Fi HaLow fits in.

How Wi-Fi HaLow supports reliable long-range data streams

The underlying IEEE 802.11ah open standard for Wi-Fi HaLow offers higher data rates than LPWAN technologies and an extended range compared to standard Wi-Fi. This allows developers to implement more demanding wireless workloads, such as compressed video streaming or high-frequency data bursts in next-generation devices.

Here’s a rundown of the standard, showing how some of the key technical specifications directly translate into operational benefits for IoT deployments:

• Sub-1 gigahertz (GHz) carrier (Figure 1): Offering good penetration through walls and supporting reliable communication in buildings, the standard also allows a range of approximately 1 kilometer (km) range outdoors, depending on deployment conditions.
• Narrow-band OFDM channels: Designed for large-scale deployments like smart cities, the standard defines a theoretical capacity of over 8,000 devices per access point. Again, this depends on real-world conditions.
• Native IP support: While Wi-Fi HaLow does require its own access points, it supports a direct interface with LAN technology. Unlike many wireless standards, this usually does not require proprietary middleware layers, simplifying deployment.

Figure 1 : Wi-Fi HaLow operates in the sub-1 GHz, making it useful for long range and high penetration. (Image source: Quectel)

Wi-Fi HaLow is also compatible with power-saving modes and Target Wake Time (TWT) operation, enabling months or years of battery life for low-duty-cycle devices. This reduces maintenance requirements for traditional IoT deployments while allowing for medium-throughput, on-demand communications.

It’s understandable that developers might be reluctant to embrace new wireless protocols for their IoT networks, but adoption doesn’t have to be difficult. Solutions exist for compact Wi-Fi HaLow integration with reduced RF design complexity.

Compact Wi-Fi HaLow modules for large-scale connectivity

The FGH100M Wi-Fi HaLow module (Figure 2) from Quectel is a prime example of how simple technology adoption can be. The module offers Wi-Fi HaLow functionality in a 13 × 13 × 2.2 millimeter (mm), 0.72 gram (g) package, making it suitable for lightweight, space-constrained IoT devices.

Figure 2: The FGH100M provides Wi-Fi HaLow functionality in a compact module suitable for battery-operated end nodes. (Image source: Quectel)

Power supply options include 3.0 to 3.6 volts for direct operation from batteries, or 1.8 to 3.6 volts from the device I/O, making it easy to slot an FGH100M module into existing designs. Integration via single SDIO, SPI, and antenna interfaces further streamlines development. In addition, Quectel offers pre-certification for Europe, America, Canada, Australia, and New Zealand, easing compliance and accelerating time-to-market.

The FGH100M series comprises two models serving different applications through high and low maximum physical layer (PHY) data rates, though real-world performance will depend on the installation conditions. The FGH100MAAMD offers up to 3.3 megabits per second (Mbits/s) communications, supporting low-to-moderate throughput applications such as smart door locks and voice assistants. For higher-throughput use cases such as compressed video intercom systems, which might require larger firmware updates or bandwidth-constrained data streaming, the FGH100MABMD supports 32.5 Mbit/s rates, depending on the channel configuration.

Conclusion

Given that the IoT is constantly evolving, it's clear that developers increasingly need long-range protocols that offer moderate data throughput at scale. Wi-Fi HaLow fits this niche well, with the added benefits of good wall penetration and native IP support. Thanks to an easy-to-integrate design and pre-certification, Quectel’s FGH100M modules present a fast way to implement Wi-Fi HaLow across various applications.