is an amendment to the IEEE 802.11 WLAN standards. The 802.11u specification,
which was ratified by the IEEE in February 2011, facilitates interworking with
external networks by allowing Wi-Fi client devices to learn more about a
network before deciding to join it. Network discovery and selection is
facilitated by the Access Network Query Protocol (ANQP), which comprises
elements defining the services offered by an access point.
An 802.11u-capable device can take advantage of Hot Spot 2.0. Hotspot 2.0, also called Passpoint or Wi-Fi 2.0, was developed by the Wi-Fi Alliance and the Wireless Broadband Association to enable the seamless handoff of traffic between cellular and Wi-Fi networks. If a subscriber is in range of at least one Wi-Fi network, the device will automatically select a network and connect to it.
Notable features of 802.11u include the transmission of pre-connection information to prospective users that defines the type of network offered (private, free public, chargeable public, emergency, etc.) as well as the venue type (educational, residential, business, vehicular, etc.). Other benefits include an enhanced data transfer rate (DTR) and service on demand.
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