In-vehicle apparatus

An in-vehicle apparatus for performing a short range communication with a road side apparatus that performs a hybrid communication including a broadcast communication with multiple unspecified vehicles and a point-to-point communication with a specific vehicle of the multiple unspecified vehicles, the in-vehicle apparatus comprising:

• a communication unit that performs communication with the road side apparatus;
• a frequency selection unit that selects a communication frequency, which is a frequency preset for the short range communication;
• a communication establishment determination unit that determines whether the communication in the point-to-point communication is successfully established in the communication unit while the road side apparatus is performing the hybrid communication;
• a retry count determination unit that determines whether a count of failure to establish the communication in the point-to-point communication in the communication unit reaches a preset retry count;
• and
• a frequency re-selection unit that re-selects the communication frequency when the retry count determination unit determines that the count of failure to establish the communication in the point-to-point communication reaches the preset retry count.

An in-vehicle apparatus for performing a short range communication with a road side apparatus that performs a hybrid communication including a broadcast communication with multiple unspecified vehicles and a point-to-point communication with a specific vehicle of the multiple unspecified vehicles, the in-vehicle apparatus comprising:

• a communication unit that performs communication with the road side apparatus;
• a frequency selection unit that selects a communication frequency, which is a frequency preset for the short range communication;
• an end signal reception unit that receives an end signal, which indicates a communication termination, from the road side apparatus via the communication unit while the road side apparatus is performing the hybrid communication
• if the communication in the point-to-point communication with the communication unit has not been established within a preset period of time;
• and
• a frequency re-selection unit that re-selects the communication frequency in response to reception of the end signal by the end signal reception unit.

An in-vehicle apparatus for performing a short range communication with a road side apparatus that performs a hybrid communication including a broadcast communication with multiple unspecified vehicles and a point-to-point communication with a specific vehicle of the multiple unspecified vehicles, the in-vehicle apparatus comprising:

• a communication unit that performs communication with the road side apparatus;
• a frequency selection unit that selects a communication frequency, which is a frequency preset for the short range communication;
• a start notification determination unit that determines whether, during the hybrid communication, the communication units has received a point-to-point start notification of the point-to-point communication within a preset time period after the communication unit received a broadcast start notification of the broadcast communication;
• and
• a frequency re-selection unit that re-selects the communication frequency when the start notification determination unit determines that the communication unit has not received the point-to-point start notification of the point-to-point communication within the preset period of time after the communication unit received a broadcast start notification of the broadcast communication.

An in-vehicle apparatus for performing a short range communication with a road side apparatus that performs a hybrid communication including a broadcast communication with multiple unspecified vehicles and a point-to-point communication with a specific vehicle of the multiple unspecified vehicles, the in-vehicle apparatus comprising:

• a communication unit that performs communication with the road side apparatus;
• a frequency selection unit that selects a communication frequency, which is a frequency preset for the short range communication;
• a time out detection unit that detects a time out of the point-to-point communication while the hybrid communication is being performed by the road side apparatus;
• and
• a frequency re-selection unit that re-selects the communication frequency when the time out detection unit detects the time out of the point-to-point communication.