The EHT (Extremely High Throughput) QoS Data Frame is a Wi-Fi 7 (802.11be) frame sent by station upstream or by AP downstream to the station.
Filter for EHT trigger frames in wireshark using the below filter
wlan.fc.type_subtype == 0x0028
Scenario- OFDMA traffic with 4 Wi-Fi 7 Client stations
Verifying fields in QoS Data frame for OFDMA-
Expand RadioTap Header>U-Sig>U-Sig Common
- Phy version identifier-0 (Represents EHT frame)
- BW- 80 MHz
Expand RadioTap Header>U-Sig>EHT-MU-PPDU
- PPDU Type and Compression Mode-0 (Represents compressed mode used for OFDMA)
Expand RadioTap Header>EHT>data
RU allocation with number of subfields as 2
To understand how EHT Trigger frame is broadcasted by the AP to solicit frames from the client devices participating in simultaneous data transmission, please refer to the EHT Trigger Frame blog
Scenario- SU traffic with Wi-Fi 7 Client station
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