Most wireless IoT protocols make you choose between range and bandwidth. LoRaWAN and NB-IoT give you kilometres of range with tiny data rates — perfectly suited for sending a temperature reading every 15 minutes, not for streaming a video feed or downloading a firmware update. 2.4 GHz Wi-Fi gives you hundreds of megabits per second but struggles to penetrate more than a few walls and tops out at 50–100 metres in open space.
Wi-Fi HaLow (IEEE 802.11ah) occupies a middle position that turns out to be exactly what a growing class of IoT deployments needs: sub-GHz operation, kilometre-scale range, IP-native connectivity, and throughput from tens of kilobits up to 347 Mbps depending on channel width and MCS settings.
How 802.11ah works
HaLow operates in licensed-exempt spectrum below 1 GHz — in most regions 863–868 MHz (Europe), 902–928 MHz (US), or 916.5–927.5 MHz (Japan and Australia). The specific band varies by region; the protocol defines how to operate across them.
Operating below 1 GHz provides two physical advantages over 2.4 GHz and 5 GHz Wi-Fi:
Propagation distance: Free-space path loss scales with the square of frequency. At 900 MHz, signal loss over a given distance is roughly 6 dB lower than at 2.4 GHz — a meaningful difference that translates to roughly double the range. In practice, HaLow access points commonly serve devices at 500 metres to 1 kilometre in open environments, and up to 100–200 metres in dense urban or indoor settings.
Building penetration: Lower frequencies diffract more readily around obstacles and attenuate less through walls. A 900 MHz signal loses roughly 5–8 dB through a single concrete wall; 2.4 GHz loses 8–12 dB; 5 GHz loses 15–20 dB. In multi-storey buildings or through metal-framed structures, the difference is substantial.
The trade-off is channel width: HaLow uses narrow channels (1, 2, 4, 8, or 16 MHz) compared to 802.11n/ac/ax’s 20–160 MHz. Narrower channels limit peak throughput, but for IoT use cases the numbers are still practical: a 4 MHz channel supports up to 43.3 Mbps; a 16 MHz channel reaches 347 Mbps.
The relay and association model
HaLow is designed to connect up to 8,191 devices to a single access point — several orders of magnitude more than a standard Wi-Fi AP. It achieves this through:
- Restricted access windows (RAW): divides time into slots and assigns device groups to specific windows, reducing contention
- Target wake time (TWT): devices negotiate scheduled wake-up periods, allowing most of the device fleet to sleep and dramatically reducing battery consumption
- Multi-AID (association ID): extends the association ID space to handle large device counts
Battery-powered HaLow devices with TWT enabled can achieve years of operation on standard batteries, with reported figures of 3–10 years for low-duty-cycle sensors depending on message frequency.
Comparison with competing protocols
| Protocol | Range | Throughput | IP native | Battery life | Device density |
|---|---|---|---|---|---|
| Wi-Fi HaLow (802.11ah) | 1 km | Up to 347 Mbps | Yes | Years (TWT) | 8,191/AP |
| LoRaWAN | 2–15 km | 0.25–50 kbps | Via gateway | 5–10 years | Thousands |
| NB-IoT | 1–10 km | 26–127 kbps | Via cellular stack | 10+ years | Thousands |
| Zigbee | 10–100 m | 250 kbps | Via gateway | 2–5 years | 65,000/network |
| Bluetooth LE | 10–100 m | 2 Mbps | Via gateway | Months–years | Limited |
| Standard Wi-Fi (2.4 GHz) | 50–150 m | 300 Mbps+ | Yes | Hours–days | ~250/AP practical |
The key differentiator is native IP connectivity with sub-GHz range. LoRaWAN requires a network server to translate LoRa packets to IP. NB-IoT uses the cellular stack. HaLow devices connect directly to the TCP/IP stack — firmware OTA updates, MQTT to cloud services, HTTPS APIs — all work without any protocol translation layer.
Where HaLow fits best
Precision agriculture
A sensor network across a 500-acre farm needs to reach devices that may be 400–800 metres from the nearest infrastructure and separated by crop canopy and undulating terrain. Cellular coverage at field level is patchy. LoRaWAN works but limits data rates (no video, slow OTA). HaLow combines kilometre-scale range with enough throughput to support soil sensor telemetry, irrigation actuator control, and periodic camera snapshots from field-mounted units — all on IP, manageable with standard network tools.
A single HaLow gateway mounted on a grain store or irrigation pump house can cover an entire mid-sized farm with devices reporting every few minutes on button cells that last years.
Smart building IoT at scale
Office buildings and hospitals have hundreds to thousands of IoT endpoints: HVAC sensors, lighting controls, access readers, asset trackers, equipment monitors. Running Ethernet to all of them is expensive; 2.4 GHz Wi-Fi has capacity constraints and penetration issues between floors. HaLow’s combination of building penetration, IP nativity, and 8,191-device capacity makes it viable as a single-protocol IoT infrastructure for large buildings.
Several building automation vendors are now embedding HaLow into sensors and controllers as an alternative to Zigbee, which requires a separate gateway to reach IP networks.
Industrial monitoring in metal-rich environments
In manufacturing facilities and warehouses, 2.4 GHz signals are absorbed and reflected by metal shelving, equipment, and racking. Sub-GHz propagates more predictably through these environments. HaLow access points mounted at ceiling level can cover large production floor areas with devices mounted on equipment, conveyors, and structural steel.
The higher throughput ceiling (versus LoRaWAN) is relevant when monitoring needs extend beyond simple telemetry to include compressed image captures, audio samples for vibration analysis, or log streams from PLCs.
Campus and utility deployments
Smart city and utility applications — street lighting, water meter networks, parking sensors, utility substation monitoring — typically require coverage across areas too large for a single Wi-Fi AP but where IP connectivity is preferred. Municipal deployments in Australia, Japan, and Singapore have been reported using HaLow for smart parking and water infrastructure, often with a single gateway per neighbourhood block.
Hardware landscape in 2026
HaLow had a slow commercial ramp after the standard was ratified in 2017, with meaningful hardware only appearing from 2021–2023. In 2026 the ecosystem is more mature:
Chipsets: Morse Micro (Australia-based, leading specialist) produces the MM6108 and MM8108 SoCs used by most production HaLow products. Newracom also produces 802.11ah chips used in several AP products. Both families support the full MCS rate range and TWT.
Access points and gateways: Eero (Amazon), Shiraz Systems, and several industrial networking vendors now offer 802.11ah access points. Industrial-grade outdoor AP units are available from vendors including Harvest Technology Group and Connexin.
Modules: Morse Micro sells reference modules; several ODM manufacturers produce compact HaLow modules in sizes comparable to ESP32 modules, targeted at embedded device designers.
Development kits: Morse Micro and Newracom offer evaluation kits that allow software teams to prototype HaLow deployments before committing to custom hardware.
Pricing has come down significantly — HaLow modules in 2026 are generally priced at US$5–15 for volume production quantities, comparable to LoRa module pricing two or three years ago.
Integration considerations
HaLow is 802.11 — the network layer behaviour is Wi-Fi. Devices associate with an AP, get an IP address via DHCP, and communicate over TCP/UDP with no additional middleware required. This is a genuine operational advantage: existing monitoring, MQTT brokers, OTA infrastructure, and network management tools all work without modification.
The practical integration points:
- Security: WPA3-Personal and WPA3-SAE are supported. Device certificate provisioning follows the same patterns as other Wi-Fi devices.
- OTA updates: standard HTTPS or MQTT-based OTA — same as any IP-connected device
- Integration with cloud platforms: AWS IoT Greengrass, Azure IoT Edge, and similar platforms see HaLow devices as standard IP endpoints
- Coexistence: sub-GHz HaLow doesn’t interfere with 2.4 GHz or 5 GHz Wi-Fi — you can run both on the same infrastructure
For organisations already operating Wi-Fi infrastructure and familiar with IP-native device management, HaLow adds long-range capability without introducing a new protocol stack or gateway tier. That’s the core appeal in a market that has historically required a separate LoRaWAN or NB-IoT network for any IoT that needs to work beyond a building.