A method for calculating a RoT threshold value in a communication system in which user terminals communicate with a base transceiver station, comprising the steps of providing a RoT minimum, maximum and margin, acquiring the maximum nominal transmit power of each user terminal, detecting the transmitted power of each user terminal, calculating the power difference between the maximum nominal transmit power and the transmitted power for each user terminal, and processing this power difference calculated for each user terminal, the RoT margin and the minimum and maximum RoT threshold to calculate the RoT threshold value.