What is HaLow?
In 2017 the wireless networking standard IEEE 802.11ah, also called Wi-Fi HaLow (pronounced “HAY-Low”), was released. HaLow uses the 900 MHz industrial, scientific and medical (ISM) unlicensed bands to extend the Wi-Fi range. The Wi-Fi Alliance supports the HaLow standard.
The Wi-Fi (802.11 a/b/g/n) range most people are familiar with operates at either 2.4 GHz or 5 GHz. At these frequencies, the radio waves do not travel as far as waves at the lower frequencies do. At 2.4 GHz, the waves can travel less than 259 m (820 feet). LPWAN can typically reach between 1 km to 10 km. In addition, obstacles like walls and doors within a building can block higher-frequency waves (2.4 GHz or 5 GHz). As shown in Figure 1, the Wi-Fi HaLow operating range spans 1 MHz to 16 MHz channels. The 1 MHz channel waves travel farther, while the 16 MHz channel provides higher data transmission rates. Using the 16 MHz channel, a top speed of 80 Mbps can be achieved.
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