A wireless communication system having at least one slave device and a master device linked with the at least one slave device, the at least one slave device transmitting a requested priority to the master device, and the master device receiving the requested priority from the at least one slave device, and determining and assigning the at least one slave device with a priority considering the requested priority and priorities of the other slave devices that are currently linked, wherein the at least one slave device transmits the requested priority according to the amount of data to be transmitted to the master device, wherein the master device communicates with the at least one slave device in accordance with a frequency of communication which is determined according to the priority, and wherein the master device adjusts the frequency of communication after each communication between the master device and the at least one slave device.