Thanks for posting in our community.
Even though the Intel® Dual Band Wireless Adapter-AC 8265 is MU-MIMO compliant, this is not a setting that can be turned off or on from the adapter. The router is the one streaming downlinks in this mode.
In order to better assist you, we would like to gather some more information:
- Please download and run the Intel® System Support Utility (while connected to your network) and share the resulting report with us.
- What software are you using to track the packages? Please share screenshots or logs of the traffic if possible.
Hello Intel Corporation
thanks for your support, and the SSU scan results shows below as Intel_SSU.txt
and i use Apple MAC pro to capture the wireless packets, which shows the Intel 8265AC announced it support MU beamformee in their proble_request, but when AP (wireless router) send the MU feedback request in VHT ND announcement packet, Intel 8265AC reply the SU (single user MIMO) in "Action No Ack" packet instead; which lead the MU-MIMO disabled. please check the captured packets at intel8265ac_clean.pcapng (would open by wireshark).
Thanks for your sharing the requested files.
We found from the Intel® SSU file that the system is connected to a 802.11n network, which works with SU-MIMO only.
MU-MIMO was introduced as an updated for 802.11ac. You could try changing the "Preferred Band" on the adapter's advanced settings to 802.11ac. However, this is actually managed by the router. The following article does a great job explaining this and other details about MU-MIMO:
- What is MU-MIMO?
NOTE: Links to third party sites are being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
I hope this information will be useful for you. Please let us know if we can assist you with anything else.
Thanks for your reply.
On Intel® SSU, the radio type can be found on the Detailed View. Expand the Networking line and click on your wireless adapter to find the 802.11 protocol used.
Alternatively, you can also open a CMD and run the following command: netsh wlan show interfaces. This will show the radio type for your wireless connection.
Thanks for the reminder, and i still think this is intel AC8265 problem, because the below output of netsh wlan show interfaces shows it is 802.11n but the speed is 866.7Mbps ( which is typical 802.11ac 2x2 80Mhz speed); and do you have any data shows the AC8256 MU-MIMO is working with which kind of WiFi AP/Router?
C:\Windows\system32>netsh wlan show interfaces
There is 1 interface on the system:
Name : Wireless Network Connection 3
Description : Intel(R) Dual Band Wireless-AC 8265
GUID : 6f22722c-4257-4f93-a445-33f7995d1a05
Physical address : 34:13:e8:5f:41:37
State : connected
SSID : TelstraBA2727-5G
BSSID : 12:13:31:ba:27:2f
Network type : Infrastructure
Radio type : 802.11n
Authentication : WPA2-Personal
Cipher : CCMP
Connection mode : Profile
Channel : 149
Receive rate (Mbps) : 866.7
Transmit rate (Mbps) : 866.7
Signal : 99%
Profile : TelstraBA2727-5G
Hosted network status : Not started
Thanks for your reply.
Please bear in mind that even though Intel® Dual Band Wireless-AC 8265 is MU-MIMO compliant, streaming is managed entirely by the router or access point.
You're correct, the connection rate seems to match 802.11ac speeds, but the fact that the network is set to 802.11n (where MU-MIMO is no supported) remains.
It is possible that MU-MIMO is not required in your network configuration, where a single device was communicating with the router when the packets were captured. On a 4x4 antennas router, MU-MIMO can work with up to four devices. It can also go the other way around, where the router is streaming to four or more clients simultaneously, that may force it to SU-MIMO.
Other than product documentation showing the adapter works with MU-MIMO, we don't have other data available regarding this protocol.
Let us know if there's anything else we can help you with.
i could confirm the MU-MIMO is working with AP and other MU-MIMO cell phones as Samsung S7. while Intel 8265 is working on 11ac mode, but only SU-MIMO, not MU-MIMO.
Below is how i can prove my conclusion:
AP will send all MU-MIMO supported client a VHT NDP packets to request client send MU feedback, while the Intel 8265 always send feedback as SU feedback, so AP cannot perform MU-MIMO.
on the contrary, samsung S7 could reply MU feedback to the AP.
it is not true that Intel 8265 is working on 11n mode, because it is tested and captured all packets between Intel 8265 and AP are in 11ac mode with Channel 149; BUT it just working on the SU-MIMO mode as I said above.
attached intel8265_S7_clean.pcapng is the wireless captured packets to show how Intel reply in SU mode.
attachedAP-MU and Intel-SU.png is the screenshot to show how AP request MU Feedback while Intel client reply SU feedback ( we expected the Intel 8265 client rely the MU feedback to make MU-MIMO work)
Thanks for sharing the screenshots.
Please allow us some time to investigate this. We'll be back with you as soon as possible.