You have stated it many times with your interpretation of Fixed Station. You have stated several times that a station that doesn't move is, by definition, a fixed station. That is an incorrect interpretation, as fixed stations are primarily used to transfer data from one fixed point to another. A control station triggers another, usually remote, station to begin or cease operation, while a base station is used to communicate with either other base or mobile stations. Pressing your PTT to trigger a repeater to carry your information automatically renders your station a control station, as it is controlling the operation of the repeater. Simplex between two stations is classified as base-to-base traffic or base-to-mobile traffic, depending on where the remote unit is located.