STAs are associated with other APs in multi-AP scenarios

In multi-AP scenarios, STAs may be associated with other APs when a long Beacon frame transmission interval is set.
STAs obtain information about peripheral WLANs in either of the following ways:
- Passive scan: STAs scan Beacon frames sent by surrounding APs to obtain WLAN information.
- Active scan: STAs actively send Probe Request frames and receive Probe Response frames to obtain wireless signals.
STA can actively or passively scan surrounding WLANs. When a STA passively scans WLANs and APs are densely deployed, the STA can receive Beacon frames from another AP but not the nearest AP, and perform association.

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