Abstract: A start trigger of an emergency call occurs. In this case, an in-vehicle emergency call apparatus mounted in a vehicle does not transmit all the positional data items presently stored in a memory unit to a service center. Alternatively, the in-vehicle emergency call apparatus transmits only the newest positional data item to the service center. Thus, even if a communication link with the service center has a low transmission speed, the positional data of the vehicle can be promptly notified to the service center.

Abstract: An incoming call waiting date and time is specified to exceed a time when a predetermined period passes after an ACC switch of an in-vehicle emergency call apparatus is switched from ON to OFF. In this case, a low power operation is continued in the in-vehicle emergency call apparatus until the incoming call waiting date and time, even after the predetermined period passes from when the ACC switch is switched from ON to OFF. Even after the predetermined period passes from when the ACC switch is switched from ON to OFF, a position information signal can be thereby transmitted to a service center based on a reception of a positional information request signal from the service center. Thus, a stolen vehicle search can be executed appropriately.

Abstract: An incoming call waiting date and time is specified to exceed a time when a predetermined period passes after an ACC switch of an in-vehicle emergency call apparatus is switched from ON to OFF. In this case, a low power operation is continued in the in-vehicle emergency call apparatus until the incoming call waiting date and time, even after the predetermined period passes from when the ACC switch is switched from ON to OFF. Even after the predetermined period passes from when the ACC switch is switched from ON to OFF, a position information signal can be thereby transmitted to a service center based on a reception of a positional information request signal from the service center. Thus, a stolen vehicle search can be executed appropriately.

Abstract: A vehicle emergency call device includes a position information receiving unit, a positioning unit, a position information storing unit, and a control unit. The position information receiving unit obtains first position information from a navigation system. The positioning unit obtains second position information by performing computation using positioning assist information received from a GPS satellite. The control unit causes the positioning unit to receive the positioning assist information while the navigation system is activated. The control unit causes the position information storing unit to store one of the first and second position information sets. The control unit transmits the one of the first and second position information sets stored in the position information storing unit through a transmitting unit to a service center for use as an emergency call when a start trigger for starting an emergency call occurs.

Abstract: A start trigger of an emergency call occurs. In this case, an in-vehicle emergency call apparatus mounted in a vehicle does not transmit all the positional data items presently stored in a memory unit to a service center. Alternatively, the in-vehicle emergency call apparatus transmits only the newest positional data item to the service center. Thus, even if a communication link with the service center has a low transmission speed, the positional data of the vehicle can be promptly notified to the service center.

Abstract: A wireless communication system for a vehicle includes a navigation apparatus and an emergency report apparatus. When a vehicle accessory switch is in an on position, the navigation apparatus performs a GPS synchronization to receive assistance data including almanac and ephemeris from a GPS satellite and outputs the assistance data to the emergency report apparatus. The emergency report apparatus stores the assistance data in a memory. In a case where an abnormal condition of the vehicle occurs when the accessory switch is in an off position, the emergency report apparatus determines whether the assistance data stored in the memory is valid for a GPS positioning. When the assistance data is valid, the emergency report apparatus starts to perform the GPS positioning to calculate a current location of the vehicle by using the assistance data stored in the memory.