Abstract: A wireless communications system and method are described. The system includes first and second stacks of respective first and second wireless communications protocols, a wireless interface to transmit and receive wireless signals, and useable by the first and second stacks, and an arbitrator is in communication with the first and second stacks. The first stack is configured to determine a first priority associated with a current message to be transmitted or received using the wireless interface and the second stack is configured to determine a second priority associated with a current message to be transmitted or received using the wireless interface. The arbitrator is configured to control which one of the first stack and the second stack can use the wireless interface based on which of the first priority and the second priority is higher.