Ensemble Encoder-Based Attack Traffic Classification for Secure 5G Slicing Networks

This study proposes an efficient traffic classification model to address the growing threat of distributed denial-of-service (DDoS) attacks in 5th generation technology standard (5G) slicing networks. The proposed method utilizes an ensemble of encoder components from multiple autoencoders to compress and extract latent representations from high-dimensional traffic data. These representations are then used as input for a support vector machine (SVM)-based metadata classifier, enabling precise detection of attack traffic. This architecture is designed to achieve both high detection accuracy and training efficiency, while adapting flexibly to the diverse service requirements and complexity of 5G network slicing. The model was evaluated using the DDoS Datasets 2022, collected in a simulated 5G slicing environment. Experiments were conducted under both class-balanced and class-imbalanced conditions. In the balanced setting, the model achieved an accuracy of 89.33%, an F1-score of 88.23%, and an Area Under the Curve (AUC) of 89.45%. In the imbalanced setting (attack:normal = 7:3), the model maintained strong robustness, achieving a recall of 100% and an F1-score of 90.91%, demonstrating its effectiveness in diverse real-world scenarios. Compared to existing AI-based detection methods, the proposed model showed higher precision, better handling of class imbalance, and strong generalization performance. Moreover, its modular structure is well-suited for deployment in containerized network function (NF) environments, making it a practical solution for real-world 5G infrastructure. These results highlight the potential of the proposed approach to enhance both the security and operational resilience of 5G slicing networks.