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----->|
          |-----W=0,FCN=2,Seq=5--X   |                    __
          |-----W=0,FCN=1,Seq=6----->|                   | W=0
DL Enable |-----W=0,FCN=0,Seq=7----->| Missing Fragments<- FCN=5,Seq=2
          |<- Compound ACK,W=0,C=0 --| Bitmap:1011011    | FCN=2,Seq=5
          |-----W=0,FCN=5,Seq=9----->|                    --
          |-----W=0,FCN=2,Seq=10---->|
          |-----W=1,FCN=6,Seq=11---->|
          |-----W=1,FCN=5,Seq=12---->|
          |-----W=1,FCN=4,Seq=13---->|
DL Enable |-----W=1,FCN=7,Seq=14---->| All fragments received
          |<-Compound ACK,W=1,C=1 ---| C=1
        (End)