Why users are associated with other APs when AP density is high

The reason is that the interval between sending Beacon frames is long. A STA obtains peripheral wireless network information in either of the following ways:
- Passive scan: A STA listens on the Beacon frames sent by APs to obtain wireless network information.
- Active scan: A STA actively sends a Probe Request frame and receives Probe Response frames to obtain wireless signals.

A STA can actively and passively scan wireless networks. When a STA passively scans wireless networks and the AP density is high, the STA can receive Beacon frames from another AP, not the nearest AP and perform association.

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