What is 802.11u? - Definition from WhatIs.com
Part of the Wireless technologies glossary:

802.11u is an amendment to the IEEE 802.11 WLAN standards that provides for connection to external networks using common wireless devices such as smartphones and tablet PCs.

An 802.11u-capable device can take advantage of Hot Spot 2.0, also called Wi-Fi Certified Passpoint, designed for public-access Wi-Fi. Hot Spot 2.0 enables cellular-like roaming among Wi-Fi networks and between Wi-Fi and cellular 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. Other benefits include an enhanced data transfer rate (DTR), and service on demand. 

Other notable features of 802.11u include the transmission of pre-connection information to prospective users defining the type of network offered (private, free public, chargeable public, emergency, etc.) as well as the venue type (educational, residential, business, vehicular, etc.); roaming consortium information; the ability to receive messages from the Emergency Alert System (EAS); and the ability to contact emergency services when necessary. Network discovery and selection is facilitated by the Access Network Query Protocol (ANQP), which comprises elements defining the services offered by an access point.

This was last updated in June 2013
Contributor(s): Stan Gibilisco
Posted by: Margaret Rouse

Related Terms


  • geo-fencing (geofencing)

    - Geo-fencing is a feature in a software program that uses the global positioning system (GPS) or radio frequency identification (RFID) to define geographical boundaries. A geofence is a virtual barr... (WhatIs.com)

  • sensor data

    - Sensor data is the output of a device that detects and responds to some type of input from the physical environment. The output may be used to provide information or input to another system or to g... (WhatIs.com)

  • sensor hub

    - A sensor hub is a connection point for multiple sensors that uses a multipoint control unit (MCU), coprocessor or digital signal processor (DSP) to compile and process data gathered from those sens... (WhatIs.com)


  • Wireless technologies

    - Terms related to wireless technologies, including definitions about wireless devices and words and phrases about radio, microwave and infrared communication.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question. Find an Answer.Powered by ITKnowledgeExchange.com

Ask An IT Question

Get answers from your peers on your most technical challenges

Ask Question
  • performance tunning

  • Performance degraded after changing optimizer mode

    Hi, When optimizer values are changed for the instance and tables are analyzed, it takes the server sometime to settle down. Esp. if the tables are being analyzed after a long time. The parser has ...

  • wireless throughput

    There are a number of factors related to this - and some of them are entirely out of your control - others can be at least accounted for. Part of what's missing in your initial description is exac...

Tech TalkComment



    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.