If you want to make the wifi perform as an uplink, you need to also bind it to the wwan interface (currently it is set on the lan interface). And in order for it to connect in sta mode, you must have the correct SSID and password (and encryption type) setup.... if anything is wrong and it cannot connect (including the SSID not being reachable), the radio will not be able to come up at all.
Try installing travelmate -- this may help your situation: