The geographic area or cellular service area is divided into small hexagonal
region called cells. It is the basic unit of a cellular system. These cells
collectively provide coverage over larger geographical areas. That is why a
user can communicate through mobile phones even if the equipment is moving
through cells during transmission. Each cell served by its own antenna. In
cellular network adjacent cells are assigned different frequencies to avoid
interference.

Advantages of cellular systems with small cells are the following:

- Higher Capacity

- Less transmission power

- Local interference only

- Robust


Fig: Hexagonal Cells   _{Your Comment}