A cellular mobile telephone system usable on board a passenger transport vehicle
includes a first transmitter-receiver station on board the vehicle and connected
to an antenna external to the vehicle to establish an external radio link between
the vehicle and a terrestrial mobile telephone network via a satellite. A base
station system having at least one antenna inside the vehicle is connected to a
base station controller. The base station system and the base station controller
have functions analogous to those of a base station system in a standard mobile
telephone network.