How to prioritize a 802.11ac over 802.11n? I have (at the office and at home) WiFi APs which serve 802.11n and 802.11ac over the same SSID.

My Galaxy S9+ never connects to the 5 GHz network on these SSIDs. I thought that this may be because the signal strength which is too low on the 5 GHz network and the 2 GHz looks more promising. 

I created a 802.11ac-only SSID and connected my phone and tested for bandwidth which was ~90 Mbps, even in the most remote part of my home.

This probably means that the algorithm which selects the standard to use is less than optimal and I would like to help it by prioritizing the 802.11ac signal on a dual-standard SSID. Is this something which is configurable a way or another on Android (specifically Oreo on an S9+)?
When the SSID is shared, the access point is responsible for band steering.


  Dual band operation with Band Steering detects clients capable of 5
  GHz operation and steers them to that frequency which leaves the more
  crowded 2.4 GHz band available for legacy clients.
  &mdash; Source


Enable band steering in your WiFi controller.