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Abstract- Event correlation and root cause analysis play a fundamental role in the process of troubleshooting all technical faults and malfunctions. An in-depth, complicated multiprotocol analysis can be greatly supported or even replaced by a troubleshooting methodology based on data analysis approaches. The mobile telecommunications domain has been experiencing rapid development recently. Introduction of new technologies and services, as well as multivendor environment distributed across the same geographical area create a lot of challenges in network operation routines. Maintenance tasks have been recently becoming more and more complicated, time consuming and require big data analyses to be performed. Most network maintenance activities are completed manually by experts using raw network management information available in the network management system via multiple applications and direct database queries. With these circumstances considered, identification of network failures is a very difficult, if not an impossible task. This explains why effective yet simple tools and methods providing network operators with carefully selected, essential information are needed. Hence, in this paper efficient approximated alarm correlation algorithm based on the k-means cluster analysis method is proposed.
Keywords- alarm correlation, alarm patterns, cluster analysis, mobile telecommunication network, root cause analysis.
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1.Introduction
The history of mobile telecommunication started in the late 1970s, when analog telephony standards were introduced to cover basic voice calls. The entire family of these analog systems is referred to as 1G. In the 1990s, the digital age of mobile communication began along with the introduction of the so-called 2G technology. Technology development, driven by moving towards mobile data transfers with ever higher speeds, resulted in the introduction of 2.5G (GPRS), 3G and 4G/LTE standards. Currently, the telecommunication community is working on the development and introduction of the 5G standard, which is supposed to be ready for use by 2020 [1].
The generic diagram a mobile telecommunication network is presented in Fig. 1.
A mobile telecommunication network consists of two major functional subsystems: the radio access network (RAN) and the core network (CN).
RAN is responsible for managing radio resources, including strategies and algorithms for controlling power, channel allocation and data rate. It allows the user terminal equipment (UE) to access network services. The RAN consists of the following elements, depending on the technology used:...