发送端:发送端每收到一个上层报文都会为其设一个唯一的序列号。收到的大报文进行分段,构造S/R报头,如 REF _Ref371456073 h 图表1所示。构造报头和数据部分连接后,按序从片段号=1的报文开始发送,并设置重传定时器,直到发送完毕。重传定时器截止之前,如果收到了接收端发送的完全确认,即数据分段全部被接收,则清除该该序列号报文的缓存和定时器;如果收到了部分确认则根据部分确认的指示重传丢失的分段;如果定时器截止时还没有收到任何接收端的回
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