Communication device

A communication device comprising:

• a reception antenna;
• a wireless communication element that synchronizes with a reception signal in an electric wave input from the reception antenna, and receives the reception signal;
• and
• a wire communication element connected to the wireless communication element and connected to an external communication device via a communication cable so that the wire communication element transmits a signal to the communication cable;
• wherein the wire communication element determines whether the wireless communication element synchronizes with the reception signal,
• wherein, when the wire communication element determines that the wireless communication element synchronizes with the reception signal, the wire communication element restricts transmitting the signal to the communication cable;
• wherein, when the wire communication element determines that the wireless communication element synchronizes with the reception signal, and further, a reception signal intensity of the reception signal is lower than a predetermined signal intensity threshold, the wire communication element restricts transmitting the signal to the communication cable;
• wherein the predetermined signal intensity threshold includes a plurality of signal intensity threshold values, which are different from each other,
• wherein the wire communication element sets one of the signal intensity threshold values according to a priority of a transmission queue when the transmission queue includes a transmission waiting packet,
• wherein the smaller the signal intensity threshold values, the higher the priority of the transmission queue, and
• wherein the wire communication element determines whether the reception signal intensity of the reception signal is lower than the one of the signal intensity threshold values, which is set by the wire communication element.

A communication device comprising:

• a reception antenna;
• a wireless communication element that synchronizes with a reception signal in an electric wave input from the reception antenna, and receives the reception signal;
• and
• a wire communication element connected to the wireless communication element and connected to an external communication device via a communication cable so that the wire communication element transmits a signal to the communication cable;
• wherein the wire communication element determines whether the wireless communication element synchronizes with the reception signal,
• wherein, when the wire communication element determines that the wireless communication element synchronizes with the reception signal, the wire communication element restricts transmitting the signal to the communication cable;
• wherein, when the wire communication element determines that the wireless communication element synchronizes with the reception signal, and further, a reception signal intensity of the reception signal is lower than a predetermined signal intensity threshold, the wire communication element restricts transmitting the signal to the communication cable;
• wherein the predetermined signal intensity threshold includes a plurality of signal intensity threshold values, which are different from each other,
• wherein the wire communication element sets one of the signal intensity threshold values according to a transmission rate of the reception signal, which is received by the wireless communication element,
• wherein the smaller the signal intensity threshold values, the lower the transmission rate, and
• wherein the wire communication element determines whether the reception signal intensity of the reception signal is lower than the one of the signal intensity threshold values, which is set by the wire communication element.