As the number of mobile devices increases and new networks technologies emerge, radio spectrum is becoming a rare resource. This stands as the major problem in the development of modern wireless technologies. In recent years, several methods and technologies were implemented to solve this problem, for example the licensed assisted-access (LAA) and the licensed shared access (LSA) frameworks allowing to use more efficiently the available radio resources. At the same time, radio resource management (RRM) researches showed that mechanisms (i.e. downlink power reduction, user service interruption) using efficiently the radio spectrum can also be applied. In this paper, we aim to propose different methods for the analysis of possible admission control scheme models to access the radio resources of a wireless network with the implementation of downlink power policy and user service interruption mechanisms. Such models could be described by a queuing system with unreliable servers within a random environment (RE). © Springer Nature Switzerland AG 2019.