Scenario- Wi-Fi 7 client station associating a WLAN with AP operating on Channel 37 in 320 MHz.
EHT Association Request-
Association Request is a management frame initiated by the 802.11be client station to negotiate association by advertising its capabilities to an AP broadcasting 802.11 be WLAN
Filter for EHT Association Request frames in wireshark using the below filter-
wlan.fc.type_subtype == 0x0000
Verifying EHT fields in Association Request-
Verifying channel width support in Association Request-
IEEE 802.11 Wireless Management>Tagged Parameters>EHT Capabilities>EHT PHY Capabilities Information> EHT PHY bits
Verify Spatial Streams and MCS supported by client-
Below image shows Client supports 2 Spatial streams for MCS 0-9 for all channel widths
EHT Association Response
Association Response is a management frame in response to the Association request sent by the AP to client. On a high level the AP responds to the capabilities advertised by the client in the Association request.
Filter for EHT Association Request frames in wireshark using the below filter-
wlan.fc.type_subtype == 0x0001
Verify EHT fields in Association Response-
IEEE 802.11 Wireless Management>Tagged Parameters>EHT Capabilities>EHT PHY Capabilities Information
Verify Spatial streams and MCS Supported by AP-
Below image shows AP supports 4 spatial streams for MCS 0-13 for all channel widths
Verify EHT Operation-
- EHT Operation Information Element-1
- Disabled Subchannel Bitmap Present- False (Channel Puncturing absent)
- Channel width-320 MHz
- CCFS0-0x0000002f (Center frequency of 160 MHz block- Channel 47)
- CCFS1- 0x0000003f (Center frequency of 320 MHz block- Channel 31)
Related Blogs-
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