Which Wi-Fi 6 feature allows multiple clients to share the same channel at the same time?

MU-MIMO allows simultaneous transmission to multiple clients using separate spatial streams, but each client still uses the full channel bandwidth rather than sharing it via sub-channel division.

OFDMA (Orthogonal Frequency Division Multiple Access) divides a single Wi-Fi channel into smaller frequency allocations called Resource Units (RUs), which can be assigned to different clients at the same time within a single transmission opportunity (TXOP). This allows an AP to serve multiple low-bandwidth clients concurrently rather than sequentially, significantly improving efficiency and latency in high-density environments - a core Wi-Fi 6 (802.11ax) innovation.

Beamforming focuses the RF signal toward a specific client to improve signal strength and range, but it does not allow channel sharing among multiple simultaneous clients.

RRM (Radio Resource Management) is an automated system for managing channel and power assignments across APs and is unrelated to per-client channel access scheduling.