Physical layer collision avoidance device and method for performing emergency transmission thereof

A physical layer collision avoidance device, belonging to a physical layer collision avoidance network, wherein the physical layer collision avoidance device comprises:

• a communication circuit;
• and
• a controller, coupled to the communication circuit and configured to:
• in response to determining that the physical layer collision avoidance device enters an emergency transmission mode, find a first physical layer collision avoidance device that is performing a corresponding first packet transmission;
• in response to determining that a first transmission priority of the first physical layer collision avoidance device is lower than a transmission priority of the first physical layer collision avoidance device, suspend the first packet transmission of the first physical layer collision avoidance device;
• and
• in response to determining that it is the physical layer collision avoidance device's turn to perform a corresponding packet transmission, control the communication circuit to send at least one emergency packet corresponding to the emergency transmission mode.