Page "Advanced Mobile Phone System" Paragraph 3

What really separated AMPS from older systems is the " back end " call setup functionality.

In AMPS, the cell centers could flexibly assign channels to handsets based on signal strength, allowing the same frequency to be re-used in various locations without interference.

This allowed a larger number of phones to be supported over a geographical area.

AMPS pioneers fathered the term " cellular " because of its use of small hexagonal " cells " within a system.