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Techniques of expanding capacity of cellular system
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A) Cell splitting :

  • Cell splitting is a method of subdividing cell into the smaller sized cell. The parent cell that was originally congested is called as macro cells and the smaller cell called as microcells.
  • The cell is divided into a smaller cell.
  • In cell splitting the transmit power must be reduced to maintain the S/I ratio.
  • The radius of the cell is decreased and the co-channel reuse ratio D/R is kept constant to improve the capacity.
  • In cell splitting large macro-cell are dedicated to high-speed traffic. The reason for a number of handoffs will be less and call progress can be smoothly done.

B) Cell sectoring :

  • Cell sectoring is a method of decreasing the co-channel interference and enhancing system performance by using a directional antenna.
  • The cell is divided into 120₀ and 60₀ sectors.
  • Cell sectoring improves the S/I ratio using a directional antenna.
  • The radius of the cell is kept constant and the co-channel reuse ratio D/R is decreased to improve the capacity. -Cell sectoring decreases the coverage area of a group of channels and increases the number of handoffs.

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