Abstract: A mobile communication apparatus and method using backscattering of a carrier is provided.

Abstract: A toll collecting system having a lock-type management for toll collection of vehicles in a toll road such as an express way. The mixed lock-type toll collecting system includes an on-board unit installed in a vehicle which enters an entrance gate and exits an exit gate of the toll road, for toll collection by radio communication; an entrance lane device installed at the entrance gate for transmitting entrance information to the vehicle which enters the entrance gate; an exit lane device installed at the exit gate for collecting the toll from the vehicle which exits the exit gate; and a central control device for controlling the entrance lane device and the exit lane device for toll collection of the vehicle which enters the entrance gate and exits the exit lane of the toll road. A radio communicator is used to provide entrance information to the vehicle by radio communication at the entrance gate for subsequent toll collection upon exit in case radio communication can be performed.