Apparatus and program for vehicular wireless communication

• US 20090017754A1
• Filed: 07/07/2008
• Published: 01/15/2009
• Est. Priority Date: 07/11/2007
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Ichikawa, Junichi
• Granted Patent: US 8,135,442 B2
• Time in Patent Office: Days
• US Class Current: 455/11.100
• CPC Class Codes: H04L 1/188 Time-out mechanisms

Abstract

A communication apparatus for use in a vehicle includes a transmission repeater, a transmission terminator and a re-number unit. In a wireless communication between the communication apparatus and a communication unit in a facility such as a toll collection booth or the like, the transmission repeater transmits transmission data to the communication unit repeatedly until receiving an acknowledgement of reception completion of the transmission data from the communication unit, and the transmission terminator terminates repeated transmissions of the transmission data by the transmission repeater when a number of the repeated transmissions of the transmission data reaches a standard value. Further, the re-number unit changes the number of the repeated transmissions of the transmission data based on a content of the transmission data from the communication unit.

Claims

1. A communication apparatus for use in a vehicle, wherein a data communication is established wirelessly between the communication apparatus and a communication unit that is installed in a station, the apparatus comprising:

a transmission repeater unit capable of transmitting transmission data to the communication unit repeatedly until receiving an acknowledgement of reception completion of the transmission data from the communication unit;

a transmission termination unit capable of terminating repeated transmissions of the transmission data by the transmission repeater unit when a number of the repeated transmissions of the transmission data reaches a standard value; and

a re-number unit capable of changing the number of the repeated transmissions of the transmission data based on a content of the transmission data from the communication unit.

2. The communication apparatus of claim 1, wherein

the re-number unit changes the standard value based on the content of the transmission data firstly bound for the communication apparatus from the communication unit at a start time of the communication with the communication unit

3. The communication apparatus of claim 1, wherein

the re-number unit determines the standard value by using a relation between each of service types and the standard value based on service type information from the communication unit that indicates one of the service types provided by the communication unit.

4. The communication apparatus of claim 1, wherein

the re-number unit changes the standard value according to a maximum number of the repeated transmissions from the communication unit.

5. The communication apparatus of claim 4, wherein

the re-number unit changes the standard value according to the maximum number of the repeated transmission included in the transmission data that is bound for the communication apparatus from the communication unit with an exception that the transmission data is used to represent the acknowledgement of the reception completion.

6. The communication apparatus of claim 1, wherein

when a no-reception period of not receiving the acknowledgement of the reception completion from the communication unit exceeds a timer period that is defined in proportion to the standard value, the repeated transmissions of the transmission data by the transmission repeater unit is terminated.

8. A communication system comprising:

the communication apparatus of claim 1; and

the communication unit installed in the station.

9. The communication unit installed in the station and capable of establishing data communication wirelessly with the communication apparatus of claim 4, wherein

the communication unit transmits the maximum number of the standard value to the communication apparatus.

10. The communication unit installed in the station and capable of establishing the data communication wirelessly with the communication apparatus of claim 5, wherein

the communication unit transmits the maximum number of the standard value as the transmission data bound for the communication apparatus with an exception that the transmission data is used to represent the acknowledgement of the reception completion.

7. A program product capable 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, wherein the program product stored in a storage medium, the program product comprising:

providing a transmission repeater unit capable of transmitting transmission data to the communication unit repeatedly until receiving an acknowledgement of reception completion of the transmission data from the communication unit;

providing a transmission termination unit capable of terminating repeated transmissions of the transmission data by the transmission repeater unit when a number of the repeated transmissions of the transmission data reaches a standard value; and

providing a re-number unit capable of changing the number of the repeated transmissions of the transmission data based on a content of the transmission data from the communication unit.