imulations if in the PC loop of each snapshot the overall TX power of each BS gets higher than the maxi- mum power allowed, we record the event and validate it to guide a future DL approach. The scheme used to maintain the output level of the BS equal or below the maximum BS TX power, is similar to an analog mechanism to protect the power amplifier. At each iteration, the MSs request more or less power, depending on their CII values. A given BS will be requested to transmit the common channels and the sum of the TCHs for all the MSs it is in communication with. If this total output power exceeds the maximum allowed for the PA, an attenuation gets applied in order to set the output power of the BS equal to its maximum level. As an RF variable attenuator would oper- ate, this attenuation gets applied on the output signal with the exception of common channels, i.e. all the TCHs are reduced by this amount of attenuation. The power of the TCH for a given mobile will be [5]: TCH(n + 1) = TCH(n) + Step - RF Attenuation. (5.16) In the multi-operator case, lother also includes adjacent operator interference, which is decreased by ACIR (dB). The UTRA Transmission System 5.5.5 System Loading 5.5.5.1 Uplink The steps for single operator loading in these simulation examples can be outlined from [5] as follows: We define the number of users in the uplink of the single operator case as N_UL_single. The latter gets evaluated according to a 6 dB noise rise over the ther- mal noise in the UL (6 dB noise rise is equivalent to 75% of the pole capacity of a CDMA system). We measure a simulation run with a predefined number of users at the end of the aver- age noise rise (over the thermal noise). If lower than 6 dB, we increase the number of users until we reach the 6 dB noise. Thus, we define here the number of users corre- sponding to a 6 dB noise rise as N_UL_single. 5.5.5.1.1 Multi-Operator Scenario with Macro to Macro Cellular Environment We define the number of users in the uplink of the multi-operator case as N_UL_multi. It get