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If the TETRA cell is a traffic limited network and the density of terminals is equal to 5 terminals per km², then the coverage radius is given by the following formula (see ERC Report 68 or User Documentation):

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body$R_{max}^{wt}=\sqrt[{}]{\frac{{{n}_{channels}}\ {{n}_{userperchannel}}}{\pi \ den{{s}_{max}}cluste{{r}_{frequency}}}}$
  (Eq. 261)

The radius of the cell of the interfering system is given by

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   = radius of the area where interferers are uniformly spread

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body${{R}_{simu}}=\sqrt{\frac{{{n}^{active}}}{\pi \ \ dens_{it}^{active}}}$
   (Eq. 262)

We have to consider 9 active interferers with a density of 5 terminals/km². Then the radius of simulation area results in:

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