Applying fuzzy inference in the supervision system of mobile telecommunication networks

In mobile telecommunication networks the transmission level is affected by objects located between transmitter and receiver stations in the so-called Fresnel-zone. These obstacles may get temporally or permanently into the zone, they can be artifi- cial or natural objects, or they can be of meteorological origin, too, like rain or fog. It is reasonable to use intelligent decision making subsystems which can decide from the degree of attenuation and from its time dependent behaviour what the reason of the attenuation could be. The paper demonstrates the intelligent module of a network supervision system created in the framework of a successfully completed National R&D Programme project. Intelligent decision support systems and the basics of fuzzy logics are introduced. In the next an application for automatically identifying the weather situation is discussed in some detail.