The Common Info field is information to the clients that are addressed in the User Info field on how they shall build the frame for the uplink data. The 9115 notation is because I have entered the AP MAC address into the ethers file in Wireshark. The most important notice is that the Basic Trigger frame is a broadcast frame (RA= ff:ff….), sent from the TA with the BSSID address. I have explained the frame format for this frame in the MU-RTS/CTS blogpost, but here is a short recap. Wireshark is able to decode it, while Omnipeek doesn’ do it. This is a new control frame the 802.11ax standard uses to trigger an uplink transmission from its associated clients.

The captured frames are the Basic Trigger frame and the Multi-STA BlockACK The MU-RTS and CTS are explained in a previous blogpost. The standard describes the use of protection with MU-RTS and CTS, but my network doesn’t use protection. It is still no available method that is able to capture frames that have data in subdivided RUs, so we capture only two packets during a UL OFDMA transmission. a part of the spectrum with lower utilization one client using a 52-tone RU in the upper part one client using a 106-tone RU (Resource unit) in the lower half a 20 MHz wide spectrum picture during the Speedtest upload test In this way, it’s easier to see how the spectrum changes, instead of doing any kind of iPerf-test. a client running Ekahau ESS with RTFM (Real Time Frequency Monitor) with Sidekick connectedĪ prefer doing Speedtest against the WlanPi because it does a finite period of ping/jitter testing, download test, and upload test. a Windows client running Wireshark receives the captures frames via sshdump a Jetson Nano in sniffer mode does packet capturing

Speedtest is started simultaneously on both clients the clients run Speedtest against a WlanPi. – associate two clients, a Samsung S10 and a Jetson Nano, to the Cisco 9115 AP controlled by the Cisco Catalyst 9800CL controller running version 16.12.0. My test network looks like this (very simple picture) the clients (STAs) sends it data uplink to the AP in parallel the AP sends a Trigger frame to the clients I have a packet capture of the UL OFDMA transmission and will explain it in this blog.Ī figure from the IEEE 802.11ax draft 4.0 tells this about UL OFDMA I have a network at home that does UL ODFMA, but it does not do DL OFDMA. But we were kicked out of the meeting room before we got good results.

During WLPC_EU we had an 802.11ax after-party where we tried to make OFDMA functioning with different vendors AP and we got someone to do OFDMA.

In laymen terms what does wireshark do