Therefore, if the data length of the transmission data to be transported by the feedback frame on the reception side is shorter than the predetermined data length which derives from the format of the frame, then the feedback frame can be transmitted from the reception side to {HEAD ~ the transmission side} without changing the format of the feedback frame and lowering {TAIL ~ the reception rate} 
Therefore , if the data length of the transmission data to be transported by the feedback frame on the reception side is shorter than the predetermined data length which derives from the format of the frame , then the feedback frame can be transmitted from the reception side to { HEAD ~ the transmission side } without changing the format of the feedback frame and lowering { TAIL ~ the reception rate }
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