24 March 2018

Cell sectoring

Cell sectoring is replacing with an omnidirectional type of the antenna at the base station by several types of a directional antenna. It is done mainly to reduce factors such as a co-channel interface. 

Some important points on cell sectoring :
  • Cell sectoring is another method to increase capacity. It keeps the radius of the cell constant and decreases the co-channel reuse ratio D/R to reduce the cluster size N. 
  • Cell sectoring is a method of decreasing the co-channel interference and enhancing system performance by using a directional antenna.
  • The size of clusters in a particular service area can be reduced because the cell sectoring increases the signal to interference ratio (SIR).
  • So in cell sectoring process enhancing the system performance by using a directional antenna and reducing the co-channel interference value. here the reduction in the co-channel interference is dependent on the amount of sectoring used.
  • So here in cell sectoring process generally cell divided in 120 ₀  &  60 ₀ sectors.
  • A cell is in sectoring is 120 ₀  then hexagon cell consists of three sectors and if the sector is 60 ₀  then the hexagonal type cell consists of six sectors. 
  • The single to noise ratio improvement allows the cellular provider to decreases the cluster size N in order to improve the frequency reuse and thus, the system capacity. 
120 ₀  and 60 ₀  sectoring

Now let us talk about some advantages and disadvantages of cell splitting to know more details about this concept.

Advantages of cell sectoring :
  • Better S/I ratio.
  • Reduces interference.
  • Increases capacity.
  • Reduces cluster size.
  • More freedom in assigning a channel

Disadvantages of cell sectoring :

  • Increases number of antennas per base station.
  • A decrease in trunk efficiency.
  • Loss of traffic.
  • Increased number of handoffs.