DEFINITION - 20

20/40 MHz basic service set (BSS): A BSS in which the supported channel width of the access point (AP)
or dynamic frequency selection (DFS) owner (DO) station (STA) is 20 MHz and 40 MHz (Channel Width
field is equal to 1) and the Secondary Channel Offset field is equal to a value of SCA or SCB.
40-MHz-capable (FC) high-throughput (HT) access point (AP): An HT AP that included a value of 1 in
the Supported Channel Width Set subfield (indicating its capability to operate on a 40 MHz channel) of its
most recent transmission of a frame containing an HT Capabilities element.
40-MHz-capable (FC) high-throughput (HT) access point (AP) 2G4: An HT AP 2G4 that is also an FC
HT AP.
40-MHz-capable (FC) high-throughput (HT) access point (AP) 5G: An HT AP 5G that is also an FC HT
AP.
40-MHz-capable (FC) high-throughput (HT) station (STA): An HT STA that included a value of 1 in the
Supported Channel Width Set subfield (indicating its capability to operate on a 40 MHz channel) of its most
recent transmission of a frame containing an HT Capabilities element.
40-MHz-capable (FC) high-throughput (HT) station (STA) 2G4: An HT STA 2G4 that is also an FC HT
STA.
40-MHz-capable (FC) high-throughput (HT) station (STA) 5G: An HT STA 5G that is also an FC HT
STA.
40 MHz high throughput (HT): A Clause 20 transmission using FORMAT=HT_MF or HT_GF and
CH_BANDWIDTH=HT_CBW40.
40 MHz mask physical layer convergence procedure (PLCP) protocol data unit (PPDU): One of the
following PPDUs: 1) a 40 MHz high-throughput (HT) PPDU (TXVECTOR parameter CH_BANDWIDTH
equal to HT_CBW40); 2) a 40 MHz non-HT duplicate PPDU (TXVECTOR parameter CH_BANDWIDTH
equal to NON_HT_CBW40); or 3) a Clause 20 20 MHz HT PPDU with the TXVECTOR parameter
CH_BANDWIDTH equal to HT_CBW20 and the CH_OFFSET parameter equal to either CH_OFF_20U or
CH_OFF_20L. The PPDU is transmitted using a 40 MHz transmit spectral mask defined in Clause 20.
40 MHz physical layer convergence procedure (PLCP) protocol data unit (PPDU): A 40 MHz highthroughput
(HT) PPDU (TXVECTOR parameter CH_BANDWIDTH equal to HT_CBW40) or a 40 MHz
non-HT duplicate PPDU (TXVECTOR parameter CH_BANDWIDTH equal to NON_HT_CBW40) as
defined in Clause 20.
4-Way Handshake: A pairwise key management protocol defined by this standard. This handshake
confirms mutual possession of a pairwise master key (PMK) by two parties and distributes a group temporal
key (GTK).
4-Way station-to-station link (STSL) transient key (STK) Handshake: A key management protocol
between two parties that confirms mutual possession of an STSL master key (SMK) and distributes an STK.
Access Network Query Protocol (ANQP): The query protocol for access network information retrieval
transported by generic advertisement service (GAS) Public Action frames.
advertisement protocol: Access Network Query Protocol (ANQP) and higher layer protocols defined
external to this standard that are used for network and service discovery.