Figure 1 WLAN roaming networking
Purpose：
The biggest advantage of WLAN networks is that a STA can move within a WLAN network without physical media restrictions. WLAN roaming allows the STA to move within a WLAN network without service interruption. An ESS includes multiple APs, and when a STA moves from one AP to another, WLAN roaming ensures seamless transition of STA services.
WLAN roaming offers the following advantages:
Retains the STA's IP address. After roaming, the STA can still access the initially associated network and retains its services.
Avoids packet loss or service interruption caused by long-term authentication.
