A method in a mobile station for calculating the signal strength of a signal from a first base station is provided. The mobile station receives a plurality of signal samples of an incoming signal. The incoming signal comprises a signal from the first base station and at least one signal from respective at least one second base station. The mobile station also determines a ratio between the total signal strength received from the first base station and interfering signals and noise from the at least one second base station. The ratio is determined based on a standard deviation for the received signal samples. The interfering signals and noise are calculating from the at least one second base station based on a calculated sum of signal strengths for the received signal samples and the determined ratio. The mobile station is further calculating the signal strength of the signal from the first base station based on the calculated interfering signals and noise from the at least one second base station and the sum
