The Wi-Fi Alliance has introduced a designation for the IEEE 802.11ah frequency called HaLow. HaLow operates in frequency bands below one gigahertz to offer longer range and lower power usage. This certification is meant for power-efficient use needs with longer-range capability such as smart home, digital healthcare, retail and connected car applications.
Wi-Fi HaLow extends into the 900 MHz band and was originally designed for wearables and low-power sensors. With a range nearly twice that of standard Wi-Fi, connections with HaLow are generally more robust in challenging environments where physical and electronic impediments such as walls and other electronics are obstacles. This would include building walls, car and truck bodies, thick clothing (including kevlar and other advanced fibers), and multiples of the same. It also operates well in dense-device environments where multiple devices communicate to a single access point.
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The Wi-Fi Alliance expects that most devices incorporating HaLow will also operate in the standard Wi-Fi frequencies of 2.4-5 GHz as well as this lower 900 MHz range. Standard IP-based connectivity and other native connections will be supported.Source: Wi-Fi Alliance