Wi-Fi HaLow

Kilometer-Range, Sub-GHz Wi-Fi Built for Battery-Powered IoT

Wi-Fi HaLow (IEEE 802.11ah) moves Wi-Fi below 1 GHz, trading raw throughput for range, penetration, and power efficiency. A single access point can cover more than a kilometer of open ground and reach sensors through walls, floors, and metal racking that stop 2.4 GHz cold. HaLow keeps what makes Wi-Fi easy to deploy: native IP addressing, WPA3 security, and standard networking tools. There is no proprietary gateway, no vendor cloud, and no protocol translation layer between the sensor and the network.

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What is Wi-Fi HaLow?

Wi-Fi HaLow is the Wi-Fi Alliance certification program for IEEE 802.11ah. Standard Wi-Fi uses 20 MHz channel, while HaLow narrows this to as little as 1 MHz. Narrower channels and lower path loss at sub-GHz frequencies give HaLow much better link margin so it reaches farther and through more obstacles than standard Wi-Fi.  

  •  Sub-GHz with 1-16 MHz channel options
  • Over 1km line-of-sight 
  • Up to 8,191 devices per access point 
  • Mesh-capable for site-wide coverage
  • Native IPv4/IPv6 and WPA3 without needing a gateway 
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Applications of Wi-Fi HaLow

Agriculture

  • Remote camera monitoring of gates, equipment, and sites
  • Location and health tracking across land

Industrial

  • Vibration, temperature monitoring on machinery
  • Worker safety and environment testing

Buildings

  • Cameras and access readers on entraces
  • Surveilllance on parking lots where Wi-Fi can't reach

Healthcare

  • Connecting sensors in any room, lobby, or hospital wing
  • Wearable patient monitors that stay connected

How Wi-Fi HaLow Compares to Other IoT Wireless Standards

HaLow does not replace 2.4 GHz Wi-Fi or Bluetooth; it fills the gap between short-range high-throughput links and long-range low-rate LPWAN.

Wi-Fi HaLow features and the benefit each delivers.
Features Benefits
Sub-1 GHz Spectrum Long range (1 km) + through walls
High Device Density (8,191) Connects an entire site from one access point
Device Power-Saving Modes Runs for years on a single coin-cell battery
WPA3 Wi-Fi Security Enterprise-grade protection

Wi-Fi HaLow Benefits & Features

Flexible Channel Widths from 1 MHz to 16 MHz

HaLow scales bandwidth to the job. A 1 MHz channel maximizes sensitivity and range for sensors sending kilobytes per hour; an 8 MHz channel supports video and firmware updates at tens of megabits per second. A single deployment can mix both, letting distant nodes fall back to narrow channels while nearby devices run wide.

Restricted Access Window (RAW) and Grouping

RAW divides channel access into time slots assigned to groups of stations, which prevents the collision storms that occur when thousands of devices attempt to associate or report simultaneously. This is what makes the 8,191-device ceiling practical rather than theoretical.

Target Wake Time (TWT)

TWT lets an access point and a station negotiate exactly when the station will wake to transmit or receive. Between those windows the radio sleeps at microamp-level current. For a sensor reporting every fifteen minutes, TWT is the difference between months and years of coin-cell operation.

MCS10 Repetition Mode

At 1 MHz, HaLow adds a 2× repetition modulation scheme that trades data rate for roughly 3 dB of additional sensitivity. It extends usable coverage at the edge of a network, where a link that would otherwise drop stays connected at reduced throughput.

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