Communication system for vehicle

A communication system for a vehicle, comprising:

• a portable identification device allowing keyless entry into the vehicle, including means for receiving an interrogation signal and means for transmitting an indication indicative signal responsive to the interrogation signal;
• a plurality of tire sensor devices, each of the tire sensor devices serving for providing information regarding a condition at a tire of the vehicle, each of the tire sensor devices including means for receiving an initiation signal and means for transmitting a condition indicative signal responsive to the initiation signal;
• a plurality of transmitting devices provided adjacent to the respective tire sensor devices, each of the transmitting devices emitting the interrogation signal and the initiation signal for different conditions within a communication area;
• a receiving device for receiving the indication indicative signal from the portable identification device and the condition indicative signal from each of the tire sensor devices;
• and
• a central controller for unlocking a door lock device, the central controller determining whether or not the portable identification device is inside an overlapped area between two adjacent communication areas,
• wherein, if the central controller determines that the portable identification device is inside the overlapped area, the central controller unlocks the door lock device, and
• wherein, if the central controller determines that the portable identification device is outside the overlapped area, the central controller maintains the door lock device locked.

A communication system for a vehicle, comprising:

• a first transmitting device emitting a first interrogation signal within a first transmission area;
• a second transmitting device emitting a second interrogation signal within a second transmission allowable area which partially overlaps with the first transmission area to form an overlap area;
• a portable device receiving each of the first and second interrogation signals from each of the first and second transmitting devices and transmitting a return signal in response to each of the first and second interrogation signals;
• a receiving device receiving the return signal from the portable device;
• and
• a controller receiving the return signal from the receiving device and controlling a door lock device in response to the return signal;
• wherein the controller determines whether or not the portable device is positioned within the overlap area between the first and second transmission allowable areas, if it is determined that the portable device is positioned within the overlap area, the controller unlocks the door lock device, and if it is determined that the portable device is positioned outside the overlap area, the controller maintains the door lock device locked.