Board communication device and cooperative road-to-vehicle / car communication system

-Board communication device that is installed in mobile stations or a base station over wireless communication and serves as a receive or transmit side between the mobile stations and between the mobile stations and the base station, wherein the on-board communication device comprising: an application processing section that periodically transmits messages to the on-board communication device on the receiving side; a transaction management portion which is connected to the application processing section and at least transaction provides services that include a retransmission and division / composition of the data received from the application processing section messages; a transfer service processing portion, which is connected to the transaction management section and adding local port numbers for identifying the upper protocols from the received from the transaction management section messages that includes the application processing section; a car-to-car communication transfer service processing portion, which is connected to the transfer service processing portion, and received message transfers from the transfer service processing section to the onboard communication device on the receiving side in an order of priorities of data processed by the application processing section applications, the message transmits to the transfer service processing section and receives therefrom and event information including error information tells; ...