To be able to increase the capacity of the system, frequencies must be re-used in the cellular layout (unless we are using spread spectrum techniques).
Frequencies cannot be re-used in adjacent cells because of co-channel interference.
The cells using the same frequencies must be dispersed across the cellular layout.
To serve hundreds of thousands of users, the frequency must be reused and this is done through cells. The area to be covered and subdivided into radio zones or cells.
Base station positioned at the center of the cell. Data communication in cellular networks served by its base station transmitter, receiver, and its control unit.
The regular repetition of frequencies in cells results in a clustering of cells. The clusters generated in this way can consume the whole frequency band.
Cellular mobile radio systems that use TDMA and FDMA rely upon frequency
reuse, where users in geographically separated cells simultaneously use the same carrier frequency.
The co-channel reuse factor D / R, is defined as the ratio of the co-channel reuse distance D between cells using the same set of carrier frequencies and the radius of the cells R1. For hexagonal cells, the reuse cluster size N and the co-channel reuse factor D/R are related by below mentioned equation.