HE-SIG-A

Two symbols of parameters common to the whole transmission, including how long the HE-SIG-B that follows is.

Reading a capture

Has to name the size of the next field, because that field is variable and a receiver cannot find the training fields after it otherwise. Every variable-length preamble field on this site is preceded by something that says how long it is; there is no other way to build one.

Where it sits

HE-SIG-A

Authored in HE MU PPDU . Drawn in 21 frames.

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