In reply to yoyow.

A Wi-Fi provider can support multiple other operators in many ways. One way is to have a well-known SSID and have roaming agreements with multiple other service providers. BT-Openzone is an example (see http://en.wikipedia.org/wiki/BT_Openzone.) In some cases, where the venue owner manages the AP, the venue owner may allow provisioning a separate SSID for the operator. To mitigate scaling the solution to large number of operators, HS2.0 allows ways for the AP to broadcast a roaming consortium identifier, as well provide responses to queries for supported NAI realms or supported 3GPP cellular operators. There are already many instances where one operator deploys and manages Wi-Fi APs but provides service to many other cellular providers.

The current approach taken by 3GPP advocates a very tight coupling between the LAA Radio and LTE. This tight coupling prevents sharing of the unlicensed radio among multiple different service providers in ways that Wi-Fi can do easily.