DEFINITION - 22

extended rate PHY using DSSS or CCK modulation (ERP-DSSS/CCK): A PHY operating under
Clause 19 rules.
extended rate PHY using OFDM modulation (ERP-OFDM): A PHY operating under 19.5 rules.
extended rate PHY using extended rate PBCC modulation (ERP-PBCC): A PHY operating under 19.6
rules.
extended service set (ESS) link: In the context of an IEEE 802.11 medium access control (MAC) entity, a
connection path through the wireless medium between a non-access-point (non-AP) station (STA) and one
of the APs that is a member of the ESS.
fast BSS transition (FT) originator: A STA that initiates the FT protocol by sending an FT Request frame
or an Authentication frame with Authentication Algorithm equal to Fast BSS Transition.
IEEE 802.11 station (STA): Any station that is conformant to IEEE 802.11. Any reference to the term
station (STA) in this standard where not qualified by the term IEEE 802.11 implicitly refers to an IEEE
802.11 station.
generic advertisement service (GAS): An over-the-air transportation service that provides over-the-air
transportation for frames of higher layer advertisements between stations (STAs) or between an
advertisement server and a non-access-point (non-AP) STA. The protocol(s) used to relay frames between
an AP, portal, and advertisement server is outside the scope of this standard. GAS supports higher layer
protocols that employ a query/response mechanism.
group addressed bufferable unit (BU): A group addressed MSDU or group addressed bufferable
MMPDU.
group temporal key security association (GTKSA): The context resulting from a successful group
temporal key (GTK) distribution exchange via either a Group Key Handshake or a 4-Way Handshake.
high-throughput (HT) basic service set (BSS): A BSS in which Beacon frames transmitted by an HT
station (STA) include the HT Capabilities element.
high-throughput-delayed (HT-delayed) block acknowledgment (Ack): A Delayed Block Ack
mechanism that requires the use of the compressed BlockAck frame and the No Acknowledgement ack
policy setting within both BlockAckReq and BlockAck frames. This Block Ack scheme is negotiated
between two HT stations (STAs) that both support HT Delayed Block Ack.
high-throughput-immediate (HT-immediate) block acknowledgment (Ack): An Immediate Block Ack
mechanism that requires the use of the compressed BlockAck frame and an implicit Block Ack request and
allows partial-state operation at the recipient. This Block Ack scheme is negotiated between two HT stations
(STAs).
high-throughput-greenfield (HT-greenfield) format: A physical layer convergence procedure (PLCP)
protocol data unit (PPDU) format of the HT physical layer (PHY) using the HT-greenfield format preamble.
This format is represented at the PHY data service access point (SAP) by the TXVECTOR/RXVECTOR
FORMAT parameter being equal to HT_GF.
high-throughput-mixed (HT-mixed) format: A physical layer convergence procedure (PLCP) protocol
data unit (PPDU) format of the HT physical layer (PHY) using the HT-mixed format preamble. This format
is represented at the PHY data service access point (SAP) by the TXVECTOR/RXVECTOR FORMAT
parameter being equal to HT_MF.