Advantage
Each cell is the center processes an individual device, which can move from one cell to another cell and receive signal.
So it does not need any reconfiguration,
Hence it is so flexible.
It is easy to install it only requires a central location with strong signals.
Disadvantage
It is very expansive to set up as it requires a central station and require satellite communication links for each cell.
When the central station is fail communication within the cell and other cells is disrupted completely. But other cell not affected.