Method and on-vehicle device for radio communication in a road toll system

摘要

The vehicle device (2) is operated in two operating modes such as energy-consuming operating mode and energy-saving standby mode and is switched sleep mode to working mode. A response signal having information about operating state of vehicle device is transmitted prior to receipt of signal, from vehicle device to radio beacon (3). The response signal is received with respect to operation state information. A determination is made to check whether radio communication process (7') is performed with longer or shorter duration. An independent claim is included for vehicle device for radio communication.