초록 ▼

When a vehicle-mounted device receives a FCM signal from a road-side communication device, the vehicle-mounted device receives or transmits a data signal in accordance with a link direction and a time slot specified by the FCM signal. When the vehicle-mounted device does not receive a signal to be r

When a vehicle-mounted device receives a FCM signal from a road-side communication device, the vehicle-mounted device receives or transmits a data signal in accordance with a link direction and a time slot specified by the FCM signal. When the vehicle-mounted device does not receive a signal to be received within an expected time, or when it transmits an ACK signal which is a last signal of communication, retry processing starts. In this retry processing, the vehicle-mounted device determines the contents of communication processing to be next carried out from both the contents of the signal transmitted from the road-side communication device and the contents of the last time communication processing.

대표청구항 ▼

[ What is claimed is:] [1.] A moving-body communication device which is mounted on a moving body and starts to communicate with an interrogator in response to a signal from the interrogator to execute a sequence of communication processing when passing through a communication area of the interrogato

[ What is claimed is:] [1.] A moving-body communication device which is mounted on a moving body and starts to communicate with an interrogator in response to a signal from the interrogator to execute a sequence of communication processing when passing through a communication area of the interrogator, said moving-body communication device comprising:a communication control device for carrying out a retry processing which controls progress of said communication processing to be continued in consideration of a progressing state of said communication processing which has already been carried out, when the moving-body communication device does not receive a signal that is transmitted from the interrogator and is to be received thereby within an expected time,wherein said communication control device allows a data signal to be received or to be transmitted in accordance with a link direction representing that the data signal is to be received by said moving-body communication device or is to be transmitted from said moving-body communication device, said link direction being specified by the signal transmitted from said interrogator, andwherein said communication control device carries out a step of said communication processing in accordance with contents of a signal transmitted from said interrogator after said retry processing starts, when the link direction specified by the signal transmitted from said interrogator after said retry processing starts is different from that specified by the signal from said interrogator immediately before said retry processing starts and when the progressing state of said communication processing is not in a last step.