Sender                    Receiver
          |-----W=0,FCN=6,Seq=1----->|
          |-----W=0,FCN=5,Seq=2--X   |
          |-----W=0,FCN=4,Seq=3----->|
          |-----W=0,FCN=3,Seq=4--X   |                    __
          |-----W=0,FCN=2,Seq=5----->|                   |W=0
          |-----W=0,FCN=1,Seq=6----->|                   |FCN=5,Seq=2
DL Enable |-----W=0,FCN=0,Seq=7--X   |                   |FCN=3,Seq=4
     (no ACK)                                            |FCN=0,Seq=7
          |-----W=1,FCN=6,Seq=8--X   |                   |W=1
          |-----W=1,FCN=5,Seq=9----->|                   |FCN=6,Seq=8
          |-----W=1,FCN=4,Seq=10-X   |                   |FCN=4,Seq=10
DL Enable |-----W=1,FCN=7,Seq=11---->| Missing Fragment<-|__
          |<-Compound ACK,W=0,1,C=0--| Bitmap W=0:1010110
          |-----W=0,FCN=5,Seq=13---->|        W=1:0100001
          |-----W=0,FCN=3,Seq=14---->|
          |-----W=0,FCN=0,Seq=15---->|
          |-----W=1,FCN=6,Seq=16---->|
          |-----W=1,FCN=4,Seq=17---->| All fragments received
DL Enable |-----W=1,FCN=7,Seq=18---->|
          |<-Compound ACK,W=1,C=1----| C=1
        (End)