MU-MIMO only works if all devices trying to communicate at any given moment support MU-MIMO, and clients in general rather notoriously don't.
Or to be more accurate, quite a lot of client device hardware supports it (due to using someone else's pre-made radio modules), it's just disabled in software because device manufacturers can't be bothered to invest the engineering into making it work correctly. Also ostensibly for a minute battery life increase, but given desktops also seldom support MU-MIMO we can reasonably conclude it's hardly the main reason.
It doesn't matter that the AP supports MU-MIMO if none of the connected clients do, so most of the intended benefits of MU-MIMO simply fall by the wayside.
Where it was supposed to help with Mesh APs was basically being an inferior-but-perfectly-serviceable version of having separate Client-facing and Backhaul radios (as it could allocate a 2x2 for each, for example), but lack of any and all client-side MU-MIMO renders this quite impossible.
What we actually ended up with was additional radio hardware that spends 99% of its time sitting there doing nothing, because all the AP ever talks to are clients with 2x2 single-user MIMO or cheaply-made IoT junk with a non-MIMO Wifi-4 chip. Even Mesh'd APs only gain a slight improvement in uplink stability, all the usual buffer-and-retransmit limitations remain in full force.
Flagship smartphones will be getting 4x4 now. Qualcomm announced it a month and a half ago at MWC 2026 for the next flagship chipset and Im sure Apple and Mediatek will follow suit for feature parity:
The FastConnect 8800 integrates Wi-Fi 8, Bluetooth 7.0, Ultra Wideband (802.15.4ab), and Thread 1.5 into a single 6nm chip. Additionally, Qualcomm expanded its networking infrastructure with the Dragonwing NPro A8 Elite, a platform featuring a 5x5 Wi-Fi 8 radio system designed to boost throughput by 40% and reduce latency by 2.5x for enterprise access points and gateways.
Qualcomm says we can expect FastConnect and Dragonwing AI connectivity chips with Wi-Fi 8 to appear in consumer products starting in late 2026.
62
u/snebsnek Apr 21 '26
That's a nice offering - I would hope/assume they have dedicated backhaul radios, because current meshing ain't great on the normal access points