Mobile Communication Systems

THE CELLULAR CONCEPT (ref)

Seems to have been first "verbalized" by D. H. Ring (AT&T Bell Laboratories) in 1947

The advent of the cellular concept was a crucial contribution in the development of mobile communication. A cell is viewed as the (approximate) coverage area of a particular land site. Each cell within a cluster is allocated a distinct set of frequencies (channels) and cells labeled with a given number -- i.e. co-channels reuse the same channel set.

As the cell size decreases traffic carrier capacity increases and, thus, cells start big and split as system grows.


With the shift parameters i and j defined in the figure, we see that the number of cells in a cluster is given by

 and the frequency reuse distance is given by 

  N Reuse Distance
     4  {2,0}  3.46 R
   7 {2,1}  4.58 R
   12 {2,2}  6.00 R

 
To further reduce intercluster interference, each cell is quite ofter sectored -- i.e.directional antennas are used at the mobile base stations.


[ref] See BSTJ (The Bell System Technical Journal), 58 (1), January 1997, pp 15-41.
 
 
 

This page was prepared and is maintained by R. Victor Jones
Comments to: jones@deas.harvard.edu.

Last updated November 10, 1999