IEEE Std 802.11aq-2018 pdf download – IEEE Standard for Information technology- Telecommunications and information exchange between systems Local and metropolitan area networks- Specific requirements Part 1 1: Wireless L AN Medium Access Control (MAC) and Physical Layer (PHY) Specifications Amendment 5: Preassociation Discovery.
4. General description 4.5 Overview of the services 4.5.4 Access control and data confidentiality services Insert the following subclause (4. 5.4.10) afiter 4.5.4.9: 4.5.4. 10 MAC privacy enhancements When a non-AP STA searches for, and connects to, an infrastructure BSS, IBSS, or PBSS or attermpts to discover services on a network preassociation, it defines the addressing of its MAC layer for the particular connection. If the STA uses a fixed MAC address it is trivial to track the STA. An MSDU transmitted by a STA is assigned a sequence number that, if never reset, can also be used to track a device irrespective of the MAC address. If OFDM is used, the PHY DATA scrambler used can enable tracking of a device irrespective of the MAC address if it is not reseeded. The dynamic nature of BSS membership combined with this tracking information allows for construction of a network of connctions, locations, and behavior. This network can be used to glean private and sensitive information regarding the individual behind the device. Furthermore, even without establishing a connection, a mobile or portable STA that gratuitously transmits Probe Request frames containing SSIDs of favored in frastructure BSS networks, or announces the existence of IBSS networks, can reveal potentially sensitive information about its location and location history. To mitigate this sort of traffc analysis a STA can support the ability to peridically and randomly change its MAC addresses and reset counters and seeds prior to association.
The generic advertisement service (GAS), described in 4.5. 10, provides both support for a STA’s network discovery and selection, and support for a conduit for communication by a non-AP STA with other information resources in a network before joining the wireless LAN. The interworking service supports emergency services by providing methods for users to access emergency services via the IEEE 802. l1 infrastructure, advertising that emergency services are supported (see 11.25.6) and identifying that a traffic stream is used for emergency services. The interworking serv ice provides QoS mapping for SSPNs and other external networks. Since each SSPN or other external network might have its own layer-3 end-to-end packet marking practice (e.g., differentiated services code point (DSCP) usage conventions), a means to remap the layer-3 service levels to a common over-the-air service level is necessary. The QoS Map service provides STAs a mapping of network-layer QoS packet marking to over-the-air QoS frame marking (i.e, user priority). The SSPN Interface service supports service provisioning and transfer of user permissions from the SSPN to the AP. The method and protocol by which these permissions are transferred from the SSPN are outside the scope of this standard.