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,FCN=1,Seq=6----->|                    |W=0
DL Enable |-----W=0,FCN=0,Seq=7--X   |                    |FCN=5,Seq=2
       (no ACK)                                           |FCN=3,Seq=4
          |-----W=1,FCN=6,Seq=8--X   |                    |FCN=0,Seq=7
DL Enable |-----W=1,FCN=7,Seq=9----->| Missing Fragment--> W=1
          |<-Compound ACK,W=0,1, C=0-| Bitmap W=0:1010110,|FCN=6,Seq=8
          |-----W=0,FCN=5,Seq=11---->|        W=1:0000001 |__
          |-----W=0,FCN=3,Seq=12---->|
          |-----W=0,FCN=0,Seq=13---->|
          |-----W=1,FCN=6,Seq=14---->| All fragments received
DL Enable |-----W=1,FCN=7,Seq=15---->|
          |<-Compound ACK, W=1,C=1---| C=1
        (End)