Mobility in this illustration is depicted through a large arrow pointing horizontally in both directions. The left end of the arrow, labeled "No mobility," is shaded light blue. The right end, labeled "High mobility" is shaded dark blue. The shading gradually darkens from left to right.

The arrow is notched in three places in equal measure. The first notch (moving left to right) is labeled "User moves only within same wireless access network." The second notch, in the center of the arrow, is labeled "User moves between access networks, shutting down while moving between networks." The third notch is labeled "User moves between access networks, while maintaining ongoing connections."