Apparatus and program for vehicular wireless communication

A method of controlling a computer to be serving as a communication apparatus for use in a vehicle to establish a wireless communication with a communication unit that is installed in a station, the method comprising:

• transmitting transmission data to the communication unit repeatedly until receiving an acknowledgement of reception completion of the transmission data from the communication unit;
• terminating repeated transmissions of the transmission data when a number of the repeated transmissions of the transmission data reaches a standard value;
• changing the standard value of repeated transmissions of the transmission data based on content of the transmission data from the communication unit. “,transmitting a beacon Service Table (BST) signal that includes an Application Entity ID (AID) data value for specifying an application type;
• and changing the standard value on the repeated transmission of the transmission data based on the AID value includes decreasing the standard value of the repeated transmissions in a case that the AID value indicates that the application type provided by the communication unit is not an electronic toll collection application in comparison to a case that the AID value indicates that the application type provided by the communication unit is the electronic toll collection application ”.

A communication system comprising:

• a first communication unit installed in a station;
• a second communication unit in a vehicle that wirelessly communicates with the first communication unit, the second communication unit including a transmission repeater unit, a transmission termination unit, and a re-number unit;
• wherein
• the transmission repeater unit transmits transmission data to the first communication unit repeatedly until an acknowledgement of a reception completion of the transmission data from the first communication unit is received;
• the transmission termination unit terminates repeated transmissions of the transmission data by the transmission repeater unit when a number of repeated transmissions of the transmission data reaches a standard value;
• the re-number unit changes the standard value of repeated transmissions of the transmission data based on content of the transmission data from the first communication unit;
• the first communication unit transmits a Beacon Service Table (BST) signal that includes an Application Entity ID (AID) data value for specifying an application type, and further wherein the re-number unit changes the standard value of the repeated transmissions of the transmission data based on the AID data value;
• and
• the re-number unit decreases the standard value of the repeated transmissions in a case that the AID data value indicates that the application type provided by the communication unit is not the electronic toll collection application, in comparison to a case that the AID data value indicates that the application type provided by the communication unit is an electronic toll collection application.