s of this example. The Radio Network Planning and Optimisation Table 2.4 Power budget for GSM 1800 RADIO LINK POWER BUDGET MS CLASS General information Frequency [MHz]: System: GSM Receiving end RX RF input sensitivity -106.00 -100.00 Interference degradation margin Cable loss + connector RX antenna gain 18.00 Diversity gain Isotropic power -124.00 -97.00 =A+B+C-D-E Field strength dB uV/m 18.31 45.31 G = F + Z Transmitting end TX RF output peak power 25.12 Mean power over RF cycle 30.00 44.00 Isolator + combiner + filter RF peak power, combiner output 30.00 41.00 M=K-L Cable loss + connector TX antenna gain 18.00 Peak EIRP 501.19 EIRP = ERP + 2 dB 30.00 57.00 P=M-N+O Isotropic path loss 154.00 154.00 0=P-F = 77.2 + 20 log (frequency [MHz]). power budget calculations start with the receiving end by calculating isotropic power (F) both for the BTS and the MS. The isotropic power is the minimum received power, which enables the link balance situation. The receiver sensitivity (A) is the basis for the isotropic power with the power budget gain parameters subtracted from it and the loss parameters added to it. The isotropic power for the BTS is F =A+B+C-D - E = -106 dBm + 3 dB + 2 dB - 18 d dBi dB = -124 dBm (2.4) and for the MS is F = - 100 dBm + 3 dB +0dB-0dBi-0dB = -97 dBm (2.5) The isotropic power is next converted to dB uV/m and the result is field strength (G). For the BTS: + Z* = - 124 dBm + 77.2 + 20 log(1800 MHz) = 18.31 dBuV/m (2.6) and field strength for the MS: G = -97 dBm + 77.2 + 20 log(1800MHz)=45.31dBuV/m = (2.7) The power budget calculation continues with the MS peak EIRP (effective isotropic radiated power) (P) calculation. The MS radiation power is presented in this way as the antenna gain uses decibels over an isotropic antenna (dBi) format. If the antenna gain format is in decibels over a dipole (dBd) the radiated power format is ERP (effective radiated power). The transformation from EIRP to ERP is given by Radio Network Dimensioning EIRP = ERP + 2 dB. As written earlier, the MS antenna gain is c