The ever increasing number of subscribers, size, competition, heterogeneity and advancement of technology in the telecommunications industry has put a lot of pressure on the network service providers to not only provide high quality services but also to ensure that services are available whenever they are required. The 3G and 4G network services require robust network system with a predictable operation level and reliability. Network faults may degrade or paralyze the network performance and its operations. Network failures are unavoidable but early detection, identification and ...