High-throughput (HT) STA

 High-throughput (HT) STA

The IEEE 802.11 HT STA provides PHY and MAC features that can support a throughput of 100 Mb/s and
greater, as measured at the MAC data service access point (SAP). An HT STA supports HT features as
identified in Clause 9 and Clause 20. An HT STA operating in the 5 GHz band supports transmission and
reception of frames that are compliant with mandatory PHY specifications as defined in Clause 18. An HT
STA operating in the 2.4 GHz band supports transmission and reception of frames that are compliant with
mandatory PHY specifications as defined in Clause 17 and Clause 19. An HT STA is also a QoS STA. The
HT features are available to HT STAs associated with an HT AP in a BSS. A subset of the HT features is
available for use between two HT STAs that are members of the same IBSS. Similarly, a subset of the HT
features is available for use between two HT STAs that have established mesh peering (see 8.4.2.58 for
details).
An HT STA has PHY features consisting of the modulation and coding scheme (MCS) set described in
20.3.5 and physical layer convergence procedure (PLCP) protocol data unit (PPDU) formats described in
20.1.4. Some PHY features that distinguish an HT STA from a non-HT STA are referred to as multiple
input, multiple output (MIMO) operation; spatial multiplexing (SM); spatial mapping (including transmit
beamforming); space-time block coding (STBC); low-density parity check (LDPC) encoding; and antenna
selection (ASEL). The allowed PPDU formats are non-HT format, HT-mixed format, and HT-greenfield
format. The PPDUs may be transmitted with 20 MHz or 40 MHz bandwidth.
An HT STA has MAC features that include frame aggregation, some Block Ack features, power save multipoll
(PSMP) operation, reverse direction (RD), and protection mechanisms supporting coexistence with
non-HT STAs.