802.11 X port-level authentication or user-level authentication

I have read many online documents about 802.11x, all that i found they named port-level authentication.
It makes sence for a wired network, sense we have got a physical port, then if the supplicant has been authenticated, his port will be open to transfer data.

And same thing with a wireless network, but we do not have physical port, we have got logical port.

I have read one document that mentioned that 802.11 is user-level authentication,,,any comment about this ?

Regards

zillah