DEFINITION - 24

halves of the occupied channel width contain the same information. This HT PPDU format supports the
lowest rate.
modulation and coding scheme (MCS) feedback (MFB) requester: A station (STA) that transmits a
physical layer convergence procedure (PLCP) protocol data unit (PPDU) containing an HT Control field in
which the modulation and coding scheme (MCS) request (MRQ) subfield is equal to 1.
modulation and coding scheme (MCS) feedback (MFB) responder: A station (STA) that transmits a
physical layer convergence procedure (PLCP) protocol data unit (PPDU) containing an HT Control field
with the MFB field containing an MCS index or the value 127 in response to a PPDU containing an HT
Control field in which the modulation and coding scheme (MCS) request (MRQ) subfield is equal to 1.
multiple basic service set identifier (BSSID) set: A collection of cooperating APs, such that all the APs
use a common operating class, channel, and antenna connector.
non-40-MHz-capable (non-FC) high-throughput (HT) station (STA): A STA that is not an FC HT STA.
nonaggregate medium access control (MAC) protocol data unit (non-A-MPDU) frame: A frame that is
transmitted in a physical layer convergence procedure (PLCP) protocol data unit (PPDU) with the
TXVECTOR AGGREGATION parameter either absent or equal to NOT_AGGREGATED.
nonbufferable medium access control (MAC) management protocol data unit (MMPDU): An
MMPDU that is not a bufferable MMPDU.
nonextended rate PHY (NonERP): A PHY conforming to Clause 16 or Clause 17, but not to Clause 19
non-high-throughput (non-HT) duplicate: A transmission format of the physical layer (PHY) that
duplicates a 20 MHz non-HT transmission in two adjacent 20 MHz channels and allows a station (STA) in a
non-HT basic service set (BSS) on either channel to receive the transmission.
non-high-throughput (non-HT) duplicate frame: A frame transmitted in a non-HT duplicate physical
layer convergence procedure (PLCP) protocol data unit (PPDU).
non-high-throughput (non-HT) duplicate physical layer convergence procedure (PLCP) protocol data
unit (PPDU): A PPDU transmitted by a Clause 20 physical layer (PHY) with the TXVECTOR FORMAT
parameter equal to NON_HT and the CH_BANDWIDTH parameter equal to NON_HT_CBW40.
non-high-throughput (non-HT) physical layer convergence procedure (PLCP) protocol data unit
(PPDU): A Clause 20 physical layer (PHY) PPDU with the TXVECTOR FORMAT parameter equal to
NON_HT.
Non-High-Throughput (non-HT) SIGNAL field (L-SIG) transmit opportunity (TXOP) protection: A
protection mechanism in which protection is established by the non-HT SIG Length and Rate fields
indicating a duration that is longer than the duration of the PPDU itself.
non-phased-coexistence-operation-capable (non-PCO-capable) 20/40 station (STA): A high-throughput
(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 and that sets the PCO field in the HT Extended Capabilities field to 0.
non-space-time-block-coding (non-STBC) frame: A frame that is transmitted in a physical layer
convergence procedure (PLCP) protocol data unit (PPDU) that has the TXVECTOR STBC parameter equal
to 0, or a frame that is received in a PPDU that has the RXVECTOR STBC parameter equal to 0.