Wireless communication system, wireless communication method, and wireless device

A wireless communication method that transmits data from a transmission device to a reception device by using a plurality of frequency channels, the method comprising:

• performing transfer control to transfer a part of traffic of one or more frequency channels in which a BER reaches a predetermined value to one or more other frequency channels in which a BER does not reach the predetermined value;
• and
• performing, for traffic remaining after a part of traffic of the frequency channels in which a BER reaches the predetermined value is transferred, reduction control to reduce at least one of a multi-level number of multi-level modulation or a coding rate.

A wireless device that transmits data by using a plurality of frequency channels, the wireless device comprising:

• a transfer controller that performs transfer control to transfer a part of traffic of one or more frequency channels in which a BER reaches a predetermined value to one or more other frequency channels in which a BER does not reach the predetermined value;
• and
• a reduction controller that performs, for traffic remaining after the transfer controller transfers a part of traffic of the frequency channels in which a BER reaches the predetermined value, reduction control to reduce at least one of a multi-level number of multi-level modulation or a coding rate.