EVALUATION OF REAL CALL SET UP SUCCESS RATE IN GSM

The Call Set up Success Rate is one of the most important Key performance Indicators (KPIs) used by all mobile operators. However there is no standard measurement possible for this parameter. Therefore the different operators can measure it differently. In this paper, a definition of a real Call Set up Success Rate, possibility of its implementation using the current technologies in GSM and difference between the real and implemented Call Set up Success rate is provided. The “real” in this case means that Call Set up Success Rate is calculated as ratio of the assigned TCHs to the channel requests. The error in measurement of real Call Set up Success Rate with activated Direct TCH Assignment feature is evaluated as well. The proposed error modeling can be used in order to guarantee a quality in measurement of Call Set up Success Rate.