DEFINITION - 25

null data packet (NDP) announcement: A physical layer convergence procedure (PLCP) protocol data
unit (PPDU) that contains one or more +HTC frames (i.e., frames with an HT (high-throughput) Control
field) that have the NDP Announcement subfield equal to 1.
operating class: An E.1 index into a set of values for radio operation in a regulatory domain.
pairwise master key (PMK) R0 key holder (R0KH): The component of robust security network
association (RSNA) key management of the Authenticator that is authorized to derive and hold the
PMK-R0, derive the PMK-R1s, and distribute the PMK-R1s to the R1KHs.
pairwise master key (PMK) R1 key holder (R1KH): The component of robust security network
association (RSNA) key management of the Authenticator that receives a PMK-R1 from the R0KH, holds
the PMK-R1, and derives the PTKs.
pairwise master key (PMK) S0 key holder (S0KH): The component of robust security network
association (RSNA) key management of the Supplicant that derives and holds the PMK-R0, derives the
PMK-R1s, and provides the PMK-R1s to the S1KH.
pairwise master key (PMK) S1 key holder (S1KH): The component of robust security network
association (RSNA) key management in the Supplicant that receives a PMK-R1 from the S0KH, holds the
PMK-R1, and derives the PTKs.
pairwise master key security association (PMKSA): The context resulting from a successful IEEE
802.1X authentication exchange between the peer and Authentication Server (AS) or from a preshared key
(PSK).
pairwise transient key security association (PTKSA): The context resulting from a successful 4-Way
Handshake exchange between the peer and Authenticator.
payload protected (PP) aggregate medium access control (MAC) service data unit (A-MSDU): An AMSDU
that is protected with CTR with CBC-MAC Protocol (CCMP) but does not include the A-MSDU
Present field (bit 7 of the QoS Control field) in the construction of the additional authentication data (AAD).
per-frame sequence counter: For Temporal Key Integrity Protocol (TKIP), the counter that is used as the
nonce in the derivation of the per-frame encryption key. For Counter mode with Cipher-block chaining
Message authentication code Protocol (CCMP), the per-frame initialization vector (IV).
phased coexistence operation (PCO): A basic service set (BSS) mode with alternating 20 MHz and
40 MHz phases controlled by an access point (AP).
phased coexistence operation (PCO) active access point (AP): A high-throughput (HT) AP that is
operating PCO.
phased coexistence operation (PCO) active basic service set (BSS): A BSS in which a PCO active access
point (AP) has the PCO Active field in the HT Operation element equal to 1.
phased coexistence operation (PCO) active non-access-point (non-AP) station (STA): A highthroughput
(HT) non-AP STA that is associated with a PCO basic service set (BSS) and following PCO.
phased coexistence operation (PCO) active station (STA): A STA that is either a PCO active access point
(AP) or a PCO active non-AP STA.
phased-coexistence-operation-capable (PCO-capable) access point (AP): A high-throughput (HT) AP
that sets the PCO field in the HT Extended Capabilities field to 1.