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The radio-resources management (RRM) in future CDMA networks is discussed taking into account the variety of services classes in 3G/4G systems. An optimising algorithm to control of data streams in up-link is described. The required signal-to-interference ratio is a criterion used in this algorithm. For this criterion, a method of interference estimation was elaborated and it is also discussed here. The simulation model for method validation is described as well as the simulation results are presented in this paper.