Method for transmitting an urgent message from a transmitting vehicle to at least one receiving vehicle via a radio network, and motor vehicle, transmitting circuit and receiving circuit

A motor vehicle comprising:

• a transmitting circuit, wherein the transmitting circuit comprises a control device that is configured to:
• detect whether a radio channel of a radio network is occupied by a transfer of a normal message of a subscriber of a radio network that is different from the motor vehicle;
• when the normal message of the subscriber is detected as occupying the radio channel, emit an urgent message in the radio channel with a transmission level that is less than a transmission level of the normal message;
• and
• adjust the transmission level of the urgent message by controlling a modem of the transmitting circuit, and/or by switching off an antenna compensation circuit,
• wherein the normal message is emitted in the radio channel by the subscriber;
• a receiving circuit, wherein the receiving circuit comprises the control device that is configured to:
• receive a superimposition signal that includes another normal message and another urgent message from the radio channel;
• reconstruct the other normal message from the superimposition signal;
• model a signal portion of the other normal message in the superimposition signal based on the reconstructed other normal message and a transmitting signal of the subscriber;
• ascertain a residual signal based on the superimposition signal and the modeled signal portion of the other normal message, wherein the residual signal describes a difference between the superimposition signal and the modeled signal portion, wherein an envelope of the transmitting signal and an envelope of the superimposition signal are adapted based on an amplitude such that a maximum amplitude of the transmitting signal coincides with a maximum amplitude of the superimposition signal, and wherein the transmitting signal is temporarily synchronized with the superimposition signal;
• and
• reconstruct the other urgent message based on the residual signal.