When an UE initiates PS services, the macro network determines
whether to offload traffic to the Wi-Fi network and whether to inform the UE of
Wi-Fi hotspots based on cell load and available Wi-Fi APs. For example, if the
cell load in the macro network reaches a specified threshold and a nearby Wi-Fi
AP is available, the macro network sends a hotspot detection notification
message to the UE, and switches the UE to the Wi-Fi network.
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