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3.20. Consider the random backoff procedure in the CSMA/CA protocol. For the following figure, assume the red arrow indicates the time of a station wishing to send a frame, and the backoff time for stations B,C,D,E, are 19us, 10us, 15us, and 7 us, respectively. Then based on the backoff procedure, please indicate the value for each of the following valuables:
考慮CSMA/CA協議的隨機後退機制。關於下圖,假設紅色箭頭描述了節點想傳送訊框的時間,而節點B、C、D、E各別計算出來的後退時間是19us、10us、15us和 7 us,則根據倒退程序方法,請填入下列變數的值 (請填入一整數):
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