Sender                    Receiver
          |-----W=0,FCN=6,Seq=1----->|
          |-----W=0,FCN=5,Seq=2----->|
          |-----W=0,FCN=4,Seq=3----->|
          |-----W=0,FCN=3,Seq=4----->|
          |-----W=0,FCN=2,Seq=5----->|
          |-----W=0,FCN=1,Seq=6----->| DL Enable
	  |-----W=0,FCN=0,Seq=7--X   |
      (no ACK)
          |-----W=1,FCN=6,Seq=8----->|
          |-----W=1,FCN=5,Seq=9----->|                    __
          |-----W=1,FCN=4,Seq=10---->|                   |W=0
DL Enable |-----W=1,FCN=7,Seq=11---->| Missing Fragment<- FCN=0,Seq=7
          |<-Compound ACK,W=0,C=0 ---| Bitmap:1111110    |__
          |-----W=0,FCN=0,Seq=13---->| All fragments received
DL Enable |-----W=1,FCN=7,Seq=14---->|
          |<-Compound ACK,W=1,C=1 ---| C=1
        (End)