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Open AccessArticle

Transform-Based Multiresolution Decomposition for Degradation Detection in Cellular Networks

1
Departamento de Ingeniería de Comunicaciones, Campus de Teatinos s/n, Andalucía Tech, Universidad de Málaga, 29071 Málaga, Spain
2
Department of Signal Theory, Telematics and Communications (TSTC), Universidad de Granada, 18071 Granada, Spain
3
Ericsson, 29590 Málaga, Spain
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(19), 5645; https://doi.org/10.3390/s20195645
Received: 24 August 2020 / Revised: 24 September 2020 / Accepted: 29 September 2020 / Published: 2 October 2020
(This article belongs to the Special Issue Intelligent Wireless Networks)
Anomaly detection in the performance of the huge number of elements that are part of cellular networks (base stations, core entities, and user equipment) is one of the most time consuming and key activities for supporting failure management procedures and ensuring the required performance of the telecommunication services. This activity originally relied on direct human inspection of cellular metrics (counters, key performance indicators, etc.). Currently, degradation detection procedures have experienced an evolution towards the use of automatic mechanisms of statistical analysis and machine learning. However, pre-existent solutions typically rely on the manual definition of the values to be considered abnormal or on large sets of labeled data, highly reducing their performance in the presence of long-term trends in the metrics or previously unknown patterns of degradation. In this field, the present work proposes a novel application of transform-based analysis, using wavelet transform, for the detection and study of network degradations. The proposed system is tested using cell-level metrics obtained from a real-world LTE cellular network, showing its capabilities to detect and characterize anomalies of different patterns and in the presence of varied temporal trends. This is performed without the need for manually establishing normality thresholds and taking advantage of wavelet transform capabilities to separate the metrics in multiple time-frequency components. Our results show how direct statistical analysis of these components allows for a successful detection of anomalies beyond the capabilities of detection of previous methods. View Full-Text
Keywords: cellular management; failure detection; self-healing; transform-based; wavelet cellular management; failure detection; self-healing; transform-based; wavelet
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MDPI and ACS Style

Fortes, S.; Muñoz, P.; Serrano, I.; Barco, R. Transform-Based Multiresolution Decomposition for Degradation Detection in Cellular Networks. Sensors 2020, 20, 5645. https://doi.org/10.3390/s20195645

AMA Style

Fortes S, Muñoz P, Serrano I, Barco R. Transform-Based Multiresolution Decomposition for Degradation Detection in Cellular Networks. Sensors. 2020; 20(19):5645. https://doi.org/10.3390/s20195645

Chicago/Turabian Style

Fortes, Sergio; Muñoz, Pablo; Serrano, Inmaculada; Barco, Raquel. 2020. "Transform-Based Multiresolution Decomposition for Degradation Detection in Cellular Networks" Sensors 20, no. 19: 5645. https://doi.org/10.3390/s20195645

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