For ComReg conducted a study on the spectrum requirements for a nationwide TETRA network for the Emergency Services. The study aimed at estimating the amount of spectrum that might be required to roll out a national TETRA network in the 380–400 MHz band providing coverage to 98% of the landmass of Ireland for hand-portable terminals and 99% coverage for mobile terminals.
The modelling approach adopted was:
- First, determine the number of cell sites required to meet the coverage objective based on typical cell sizes
- Then, calculate the number of carriers required in each cell site to meet the projected local capacity, and
- Finally, determine the required spectrum by considering the frequency re-use factor.
A key consideration was the requirement to meet hand-held coverage in the Dublin area.