Patent ID: 8570868

Claim:
A congestion control method for a communication system supporting layered radio channel structure for communication between at least a first communication device and a second communication device, the layered structure comprising at least a physical layer and a medium access layer, the communication system offering a first type of service with a first priority order and a second type of service with a second priority order with messages comprising a preamble and a payload transmitted between devices, each physical layer and medium access layer message being separated by at least a period corresponding to a minimum allowable period between messages, the method comprises the following acts performed by the first communication device: generating a physical layer message pertaining to the first type of service; sensing the radio channel idle for at least a period corresponding to the minimum allowable period between messages; and transmitting the physical layer message comprising a preamble indicative of the type of service the message pertains, wherein the content of the preamble is arranged to be detected by the second communication device within a communication range even if the payload of the transmitted message is corrupted by interference.