As they move, they switch between neighboring cells and must adjust their routing tables accordingly. Routing over the satellite network uses cell addresses. When satellites move to new cells they must change their routing tables accordingly. To best visualize the satellite motions consider any of the 4 circles in the figure above. Every period of time the satellites rotate counter clock-wise to the next position on the grid, assuming responsibility to the respective cell.
Questions Answer the following questions.
Explain your designs briefly to ensure that we understand your answers. Suppose the satellites use a simple routing rule. Suggest an alternative simple routing rule that accomplishes shortest-path routing. This address changes when subscriber units move to a new cell. There are terrestial gateways centers in some of the cells that provide name-address directory services.