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P802.11aq Pre-Association Service Discovery

This amendment enables pre-association service discovery in IEEE 802.11 stations, allowing discovery of services on a WLAN. It also provides provisioning and configuration of services in the access point, and enables service attributes.

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P802.11aq Pre-Association Service Discovery

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  1. P802.11aq Pre-Association Service Discovery Summary Date: 2017-11-07 Authors: Stephen McCann, BlackBerry

  2. Purpose • The P802.11aq amendment enables delivery of pre-association Service Discovery information by IEEE 802.11 stations (STAs). • Pre-association protocol designed to discover services on a WLAN • Printer discovery in a hotel Stephen McCann, BlackBerry

  3. Technical Highlights • Container MAC protocol to carry upper layer service discovery protocols (e.g. UPnP, mDNS) • Provisioning and configuration of services in the access point • Service Transaction Proxy is a logical element connected to the access point • Universal identification of services • Using a hash name • Provide service attributes (e.g. 3D printer capability or point of sale service)

  4. So why does P802.11aq help? • Discover services without having to connect to the network: • Information about services that can be accessed/reached IF STA 1 subsequently chooses to connect to STA 2. • This is the first pre-association mechanism to use STA specific information in a request (uplink). Stephen McCann, BlackBerry

  5. Device Configuration • Majority of 802.11 STAs are configured with a saved network (including local administration policy) ‘out of band’. Most devices have multiple saved networks. • 802.11 Provisioning for Public networks: • Captive Portal or Passpoint • 802.11 Provisioning for Enterprise networks: • Provisioning SSID, Out of Band (e.g. USB connection to a PC), or mobile device management (MDM) • This enables the wireless device to successfully connect and interoperate on a LAN. • Note: This amendment would allow a device to determine information about the local administration used by an AP pre-association. Stephen McCann, BlackBerry

  6. Pre-association Privacy • Fixed MAC addresses can be tracked • Some countries have a legal requirement to provide privacy of device addresses • “It's a real issue because stores can buy Wi-Fi equipment that logs smartphones' MAC addresses, so that shoppers are recognized by their handheld when they next walk in, or walk into affiliate shop with the same creepy system present. This could be used to alert assistants, or to follow people from department to department, store to store, and then sell that data to marketers and ad companies. • Public wireless hotspots can do the same. Transport for London in the UK, for instance, used these techniques to study Tube passengers. • Regularly changing a device's MAC address is supposed to defeat this tracking.” • [The Register] Stephen McCann, BlackBerry

  7. IEEE 802.11aq and IEEE 802c-2017 • MAC address shall conform to IEEE 802-2014 and IEEE 802c-2017 • Pre-association: • MAC address follows IEEE 802-2014 format • MAC behaviour when MAC address privacy is enabled: • Shall select a random MAC address in the local address space in accordance with IEEE 802c-2017 • When the STA selects a network to associate it checks dot11LocallyAdministeredMACConfig to config its MAC address according to the network its associating with. • dot11LocallyAdministeredMACConfig is configured for a saved network on the device by the local administrator of the network Stephen McCann, BlackBerry

  8. Progress • P802.11aq • P802c Stephen McCann, BlackBerry

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