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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+)?

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  • This is a function of the router, as the answer below states it is not controlled by the phone. If you want the phone to "control" this, you could need to have a unique SSID for each network type you would connect to (or at least a unique one for 802.11ac). Or if you device is cable, to limit the phone to only use 802.11ac by disabling other bands (not likely in modern devices).
    – acejavelin
    Aug 17, 2018 at 4:09

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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. — Source

Enable band steering in your WiFi controller.

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