An Introduction to Wi-Fi HaLow for IoT applications

The Internet of Things (IoT) relies on a diverse range of wireless technologies, each with distinct transmission ranges, data rates, power efficiencies, and scalability. Each of these technologies is tailored to the specific needs of different applications.

Wi-Fi HaLow (IEEE 802.11ah) and LoRaWAN are both low-power wide-area network (LPWAN) protocols that address IoT connectivity but differ significantly from other technologies like Bluetooth Low Energy - 802.15.4 (BLE), ZigBee, and ISA100a/wHART, traditional Wi-Fi, cellular IoT (NB-IoT, LTE-M), and private LTE (PLTE).

This article offers a comprehensive comparison of the technical specifications, applications, and adoption trends for each technology, providing guidance for IoT developers and engineers.

Technical Specifications

This section compares key characteristics of each technology, including frequency band, range, data rate, power consumption, device density, security, and cost.

Frequency Band

Wi-Fi HaLow operates in the sub-1 GHz spectrum band (typically 902–928 MHz in the US and 863–868 MHz in Europe), which offers superior penetration and range compared to 2.4 or 5 GHz bands.

Similarly, LoRaWAN utilizes sub-1 GHz frequencies and depends on Chirp Spread Spectrum modulation for long-range, low-power transmission. BLE and ZigBee mainly operate in the 2.4 GHz band, which they share with traditional Wi-Fi; however, ZigBee also accommodates 868/915 MHz frequencies in specific regions.

Traditional Wi-Fi operates on the 2.4 GHz, 5 GHz, and, more recently, on 6 GHz bands to optimize throughput. Cellular IoT technologies, such as NB-IoT and LTE-M, work in licensed LTE bands to provide reliable, wide-area connectivity. Private LTE can use either licensed or unlicensed bands, depending on the deployment.

Range

Wi-Fi HaLow supports ranges up to 1 km, with real-world tests showing data delivery at 3 km and HD video delivery up to 600 meters in line-of-sight. LoRaWAN extends further, reaching 5 km in urban environments and up to 10 km in rural areas, with a world-record transmission of 766 km under ideal conditions.

BLE typically supports up to 100 meters and can be extended using mesh networking, while ZigBee offers 10 to 100 meters per hop. Traditional Wi-Fi generally achieves a range of (±) 25 meters indoors, depending on the type of attenuators used. At the same time, NB-IoT and LTE-M can support ranges of 10 to 40 km, depending on terrain and tower placement. Private LTE has similar reach, dictated by deployment parameters.

Data Rate

Wi-Fi HaLow offers data rates from 150 Kbps to 15 Mbps, supporting more demanding applications like video and firmware updates. LoRaWAN is designed for small, infrequent packets, with data rates ranging from 250 bps to 50 Kbps. BLE, especially with Bluetooth 5, supports up to 2 Mbps, which is suitable for smart home devices.

ZigBee maintains a constant 250 Kbps rate, while traditional Wi-Fi can deliver several gigabits per second. NB-IoT is comparable to LoRaWAN in speed (up to 250 Kbps), while LTE-M provides up to 1 Mbps. Private LTE data rates vary but can match or exceed those of LTE-M, depending on the deployment.

Power Consumption

Wi-Fi HaLow incorporates energy-saving features like Target Wake Time (TWT) and Restricted Access Window (RAW), enabling years-long battery life and efficient transmission cycles. 

LoRaWAN is even more power-efficient, allowing devices to function for years on small batteries with infrequent communication. BLE is optimized for very low power, enabling use in coin-cell-powered wearables. 

ZigBee supports battery operation across mesh networks with low power requirements. Traditional Wi-Fi, in contrast, consumes a high amount of power and is generally unsuitable for battery-powered IoT devices. NB-IoT and LTE-M are optimized for low power, while Private LTE varies and tends to consume more due to network complexity.

Device Density

Wi-Fi HaLow supports up to 8,191 devices per access point, ideal for dense deployments. LoRaWAN can connect thousands of devices per gateway, depending on the configuration. BLE mesh networks can support up to 32,767 devices, and ZigBee networks allow for up to 65,000 nodes.

Traditional Wi-Fi supports a variable number of devices per access point, depending on the vertical; however, 6 GHz enhances that scalability. 5G cellular technologies can support millions of devices per cell, and private LTE can handle high densities, depending on its design.

Security

Wi-Fi HaLow utilizes WPA3 encryption with 128-bit mode, providing robust security comparable to enterprise Wi-Fi, which also offers WPA3 encryption, but is still clinging to WPA2 for dear life. LoRaWAN employs AES-128 encryption, but vulnerabilities in its counter mode have raised concerns about availability and privacy.

BLE also uses AES-128, providing reliable encryption for short-range devices. ZigBee adheres to the AES-128 standard; however, interoperability issues can occasionally compromise its security. Traditional Wi-Fi still supports protocols ranging from WEP to WPA3. At the same time, cellular IoT and Private LTE utilize standardized protocols with enhanced security levels.

Cost

Wi-Fi HaLow is affordable, particularly when utilizing existing Wi-Fi infrastructure, although new chipset costs can raise initial expenses. LoRaWAN provides low-cost devices but may lead to additional expenses for gateways. BLE and ZigBee are both cost-effective and widely supported. Traditional Wi-Fi devices are inexpensive, but infrastructure costs can vary. Cellular IoT solutions (NB-IoT and LTE-M) are reasonably priced, considering device costs and subscription fees. Private LTE is typically the most expensive due to its specialized infrastructure.

Suitability for High Bandwidth Applications

Wi-Fi HaLow is particularly effective in bandwidth-intensive and mid-range deployments, such as smart home security cameras, HVAC systems in smart buildings, and industrial monitoring. For instance, the high profile Abode Edge camera benefits from HaLow's extended range.

LoRaWAN excels in long-range, low-data-rate applications such as agricultural monitoring (like soil sensors), smart parking systems, and environmental observation. A notable example is Amsterdam’s CityFlows project, which utilizes LoRaWAN for traffic analytics.

BLE excels in short-range consumer IoT by powering wearables, retail proximity beacons, and smart thermostats. ZigBee is widely used in mesh-based applications such as smart lighting and industrial controls.

Traditional Wi-Fi remains the standard for high throughput needs such as video streaming and internet access. NB-IoT is well suited for smart meters and environmental sensors, while LTE-M supports more demanding IoT functions like asset tracking and healthcare wearables. Private LTE finds its niche in industrial and enterprise networks where secure, dedicated bandwidth is essential.

Adoption Trends

As of 2023, LoRaWAN leads LPWAN technologies outside of China, capturing approximately 41% of the global market and serving hundreds of millions of devices. It is projected to grow from $3.7 billion in 2024 to significantly more by 2034, with a 41.1% CAGR, due to ecosystem support from the LoRa Alliance.

Wi-Fi HaLow, although newer, is gaining momentum with several million devices deployed in 2024 and is projected to surpass 100 million devices by 2029. Its market is expected to reach $1.5 billion by 2030. The Wi-Fi Alliance’s certification efforts, along with products from companies like Silex and Morse Micro, are driving adoption.

BLE is found in billions of devices, dominating the consumer IoT market. It is especially popular in wearables and smart home gadgets. ZigBee also enjoys widespread deployment in home automation, benefiting from strong support from the Zigbee Alliance.

Traditional Wi-Fi is widespread, and the newer versions (Wi-Fi 6 and 7) enhance its utility for IoT. Cellular IoT technologies are expanding globally, supported by telecom infrastructure, while Private LTE is growing in industrial sectors that require dedicated and secure networks.

Experimental Insights

A 2023 study conducted in Brisbane, Australia, compared Wi-Fi HaLow and LoRa in smart grid applications. Wi-Fi HaLow demonstrated significantly higher throughput, achieving nearly 5 Mbps, compared to LoRa’s 20.4 Kbps. However, LoRa had an advantage in reliability with lower packet loss (1.6% at 1 km), while HaLow experienced notable degradation beyond 500 meters.

These findings highlight that Wi-Fi HaLow is more appropriate for high-bandwidth use cases such as advanced metering and home energy systems, while LoRa excels in long-distance, low-power applications without requiring line-of-sight.

Choosing the Right Technology

Wi-Fi HaLow is an excellent option for IoT deployments that require higher throughput, Wi-Fi integration, or a high device density over distances of up to 3 km.

For rural, sparse environments where long-range and low bandwidth are sufficient, LoRaWAN is the optimal choice. BLE is best for ultra-low-power, short-range consumer applications, while ZigBee supports robust mesh networks in homes or industrial setups.

Traditional Wi-Fi serves high-speed, local IoT when power is available. For low-data cellular applications, such as smart meters, NB-IoT is ideal, whereas LTE-M accommodates bandwidth-hungry IoT applications, like asset tracking. Private LTE is tailored for secure, large-scale networks in controlled environments such as campuses or factories.

Future Outlook

LoRaWAN is expected to maintain dominance in long-range, low-data IoT applications, especially in agriculture and smart cities. Wi-Fi HaLow is rapidly gaining traction due to its ability to deliver higher bandwidth over longer ranges while integrating with existing Wi-Fi ecosystems. Its future looks even brighter with the potential adoption of standards like Matter, which bolster its smart home integration.

BLE and ZigBee will continue to lead in short-range consumer and automation markets. Meanwhile, cellular IoT and Private LTE will play vital roles in connecting wide-area, high-security, and mission-critical Internet of Things (IoT) applications. The choice of technology will ultimately hinge on balancing power, range, throughput, cost, and infrastructure compatibility.