ase dependent due to the body loss of the MS user and therefore a 0 dBi gain is normally used in the calculations. The losses are also zero and therefore the EIRP of the MS is the TX output power (K) and the MS power is fixed according to the MS class: K - L - N + O = 30 dBm 0dB - 0 dB + 0dBi = 30 dBm (2.8) The isotropic path loss (Q) for the uplink is the EIRP minus the isotropic power: Q=P-F=30 dBm - (-124 dBm) = 154 dB (2.9) The path loss for the downlink direction equals the path loss for the uplink direction. With this the BTS TX output peak power calculation can be started. As mentioned before, the BTS TX power is critical for the link balance. Firstly the BTS peak EIRP is =Q+F=154dB+(-97 dBm) = 57 dBm (2.10) Then continuing to the BTS TX power, the downlink EIRP is subtracted by the BTS antenna gain (O) and added to the cable loss (N) and isolator, combiner and filter loss (L): = M L = P + N - + L = 57 dBm + 2 dB - 18 dBi + 3 dB = 44 dBm (2.11) A typical value for dimensioning the traffic created by one subscriber is 15-30 mErl (milli- Erlang). What does, for example, 25 mErl mean in practice? The user talks during a busy hour for 60 X 60 X 25 mErl = 90 seconds. This much capacity needs to be reserved for one user to meet the planned requirements. Network dimensioning is performed for the busy hour traffic, which ensures that the availability for users is as good as possible. The blocking probability describes the probability that the MS cannot initiate a call because all of the traffic channels have been reserved at that time moment. The blocking probability and estimated traffic give the required number of channels using the Erlang formulas, where formula B for the non-queing situation and formula C for the situation where queing is possible can be used for dimensioning. In traffic calculations the first assumption is that the subscribers are evenly distributed inside the planned area. The number of required channels, traffic and signalling channels specify the numbers of TRXs and BTSs. From these the mi