HE-SIG-A2

The second HE-SIG-A symbol — mostly coding and duration.

Reading a capture

PLAN.md §6 recorded this field as described but not bit-mapped in the prototype. It is mapped here, and that map is a reconstruction rather than a reading of the standard — treat it accordingly.

Subfields

• TXOP — Duration information for stations that can decode HE-SIG-A.
• Coding — BCC or LDPC.
• STBC — Space-time block coding in use.
• Beamformed — Whether a beamforming steering matrix was applied.
• Doppler — Indicates midamble use for high-mobility channels.
• CRC — A four-bit check over the HE-SIG-A contents.

Where it sits

HE SU PPDU > HE-SIG-A > HE-SIG-A2

• Open in the explorer — Ack
• Open in the explorer — TCP over IPv4, in a protected QoS Data frame, aggregated
• Open in the explorer — Association Request
• Open in the explorer — Association Response
• Open in the explorer — Beacon
• Open in the explorer — Compressed Block Ack
• Open in the explorer — CTS
• Open in the explorer — Four-way handshake message 1
• Open in the explorer — Four-way handshake message 2
• Open in the explorer — Four-way handshake message 3
• Open in the explorer — Four-way handshake message 4
• Open in the explorer — Probe Request
• Open in the explorer — Probe Response
• Open in the explorer — ARP request in a QoS Data frame
• Open in the explorer — ICMP echo over IPv4, in a QoS Data frame
• Open in the explorer — UDP over IPv6, in a QoS Data frame
• Open in the explorer — TCP over IPv4, in a protected QoS Data frame
• Open in the explorer — TCP over IPv4, in an open QoS Data frame
• Open in the explorer — UDP over IPv4, in a QoS Data frame
• Open in the explorer — RTS
• Open in the explorer — Trigger frame

Accuracy

Clause

802.11-2024 §27.3.11.6

Verified

Not verified against the standard. Treat this as a claim, not a fact.