Browsing by Author "Asikainen, Eero"

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  • Anomaly Detection in Radio Access Network Performance Data
    (2024-06-17) Asikainen, Eero
     Perustieteiden korkeakoulu | Master's thesis
    Mobile network operators deploy, configure, and maintain mobile networks, which play an important role in providing ubiquitous communication services to their customers. A key component of these networks are the base stations, whose performance is actively monitored by gathering performance data. Anomalies in this data may be indicative of malfunctions, which can originate from various reasons. Due to the immense volume of the data, automatic solutions are needed to be able to detect such anomalies. This thesis explores the design of an automatic anomaly detection method for the performance data of 4G base stations. The dataset that is used in the work includes 13 mobile network key performance indicators across 500 base stations gathered from a large Finnish network operator. The dataset is unlabeled, so a small scale test dataset is created, which includes manually selected examples of anomalies out of the whole dataset. Multiple existing anomaly detection methods are compared. The methods are evaluated based on their ability to detect relevant anomalies while minimizing the amount of false positives generated. The anomalies they find on the whole dataset are visually inspected, and the methods are analyzed against design requirements. The best performing methods are selected to be joined into one combined method, which is shown to be able to rank base stations based on how anomalous their behavior is across all the key performance indicators.
  • Lämpötiladatan klusterointi sähköbussisimulaatiota varten
    (2020-11-30) Asikainen, Eero
     Insinööritieteiden korkeakoulu | Bachelor's thesis