Communications system having a communications adapter and a coordination device, and communications adapter, coordination device and method for carrying out a communication

A communication adapter for a communication system, comprising:

• a transmission/reception unit;
• an air interface configured to operate a communication connection to at least one of a first motor vehicle and a vehicle-external coordination device of the communication system based on at least one of radio waves, infrared waves, and micro-waves;
• and
• a processor configured to:
• receive first warning data from at least one of the first motor vehicle and the vehicle-external coordination device via the communication connection,
• initiate a first traffic-coordinating measure based on the first warning data received from the at least one of the first motor vehicle and the vehicle-external coordination device,
• receive motor vehicle data describing a traffic behavior and/or a traffic environment of a second motor vehicle from a control device of the second motor vehicle,
• write the motor vehicle data received from the control device of the second motor vehicle into a predetermined buffer store,
• when a release criterion is satisfied, transmit the motor vehicle data written into the predetermined buffer store to the vehicle-external coordination device via the transmission/reception unit, the release criterion including a successful authentication and/or a successful proof of identity of a motor vehicle other than the second motor vehicle which requests the motor vehicle data,
• when the release criterion is not satisfied, to not transmit the motor vehicle data written into the predetermined buffer store to the vehicle-external coordination device via the transmission/reception unit,
• receive second warning data generated by the vehicle-external coordination device describing a traffic behavior and/or a traffic environment of the second motor vehicle, via the transmission/reception unit, and
• initiate a second traffic-coordinating measure based on the second warning data generated by the vehicle-external coordination device, the second traffic-coordinating measure including an output of a warning to a motor vehicle occupant of the second motor vehicle.

A method for carrying out a communication in a communication system which includes a motor vehicle, among motor vehicles, each of the motor vehicles having a control device, a portable communication adapter separate from the motor vehicle and reversibly coupleable to the control device, and a vehicle-external coordination device, the method comprising:

• receiving, by the communication adapter, motor vehicle data describing a traffic behavior and/or a traffic environment of the motor vehicle from the control device;
• writing, by the communication adapter, the motor vehicle data received from the control device into a predetermined buffer store;
• when a release criterion is satisfied, transmitting the motor vehicle data to the vehicle-external coordination device via a transmission/reception unit of the communication adapter, the release criterion including a successful authentication and/or a successful proof of identity of an other motor vehicle, among the motor vehicles, requesting the motor vehicle data;
• when the release criterion is not satisfied, not transmitting the motor vehicle data written into the predetermined buffer store to the vehicle-external coordination device via the transmission/reception unit;
• receiving, by the communication adapter, warning data generated by the vehicle-external coordination device describing a traffic behavior and/or a traffic environment of the other motor vehicle;
• and
• initiating a traffic-coordinating measure based on the received warning data describing the traffic behavior and/or the traffic environment of the other motor vehicle, the traffic-coordinating measure including an output of a warning to an occupant of a motor vehicle, among occupants of the motor vehicles.