Electronic toll collection system, on-board unit, and terminal unit

An electronic toll collection system comprising an on-board unit mountable on a vehicle, a first terminal unit, and a second terminal unit;

• the on-board unit comprising:
• a vehicle-side first communication circuit configured to wirelessly communicate with a roadside unit for transmitting entrance data indicative of a tollroad entrance the vehicle passes through;
• a vehicle-side second communication circuit configured to communicate with the first terminal unit;
• a vehicle-side third communication circuit configured to communicate with the second terminal unit;
• a vehicle-side memory device;
• and
• a vehicle-side control circuit configured to control the vehicle-side first, second, and third communication circuits and the vehicle-side memory device and configured to perform data processing necessary for a toll collection transaction;
• the first terminal unit comprising:
• a first terminal-side first communication circuit configured to communicate with the on-board unit;
• a first terminal-side second communication circuit configured to communicate with the second terminal unit;
• a first terminal-side memory device;
• and
• a first terminal-side control circuit configured to control the first terminal-side first and second communication circuits and the first terminal-side memory device;
• the second terminal unit comprising:
• a second terminal-side first communication circuit configured to communicate with the on-board unit;
• a second terminal-side second communication circuit configured to communicate with the first terminal unit;
• a second terminal-side memory device;
• and
• a second terminal-side control circuit configured to control the second terminal-side first and second communication circuits and the second terminal-side memory device;
• wherein the vehicle-side control circuit receives the entrance data from the roadside unit through the vehicle-side first communication circuit and causes the vehicle-side memory device to store the entrance data, the vehicle-side control circuit transmitting the entrance data and payment card data prestored in the vehicle-side memory device to the first terminal unit through the vehicle-side second communication circuit upon satisfaction of a first predetermined condition,
• wherein the first terminal-side control circuit receives the entrance data and the card data from the on-board unit through the first terminal-side first communication circuit and causes the first terminal-side memory device to store the entrance data and the card data, the first terminal-side control circuit transmitting the entrance data and the card data to the second terminal unit through the first terminal-side second communication circuit in response to a data request that is received from the second terminal unit through the first terminal-side second communication circuit,
• wherein the second terminal-side control circuit receives the entrance data and the card data from the first terminal unit through the second terminal-side second communication circuit upon transmission of the data request to the first terminal unit and generates toll collection data based on the entrance data and the card data, the second terminal-side control circuit transmitting the toll collection data to the on-board unit through the second terminal-side first communication circuit upon satisfaction of a second predetermined condition,
• wherein the vehicle-side control circuit deletes the entrance data from the vehicle-side memory device upon receipt of the toll collection data from the second terminal unit through the vehicle-side third communication circuit, and
• wherein the first terminal-side control circuit deletes the card data and the entrance data from the first terminal-side memory device upon transmission of the card data and the entrance data to the second terminal unit.