Availability analysis of GSM network systems

The Global System for Mobile communication (GSM) is now worldwide-accepted standard for digital cellular systems. With the increasing of GSM popularity, customers are expecting a high level of service, from which availability is considered the major measure of quality. The availability block diagram model is selected to model the system, taking into account the signal strength and signal covering overlaps exist in GSM systems. The real data is collected from Korek telecom. The results show that overlapping cells ensure that full coverage retained, even in the case of hardware outage. The main problem can be concluded after analyses the statistics of different components of RBS is high value of MTTR of CDU´s, Antenna System and DRU´s, which cause the lowest availability value compare to the other components. Increasing number of Microwaves HOPs, decrease the overall availability and reliability of the cellular system. It is the first time the availability of GSM network performance is studied with real data on ground and functioning.