With the rapid development of the Internet of Things (IoT) and edge computing, the scale and complexity of modern networks have increased significantly, driving the demand for distributed fault diagnosis. Federated learning (FL) effectively addresses the issues of data privacy and dispersion by enabling edge devices to collaboratively train models without sharing raw data. However, existing FL-based fault diagnosis methods still encounter the following challenges. Firstly, static aggregation strategies struggle to balance the contributions of heterogeneous clients dynamically. Secondly, traditional local models are unable to effectively decouple sparse high and low-frequency features in fault signals, thereby limiting the accuracy of fault identification. Finally, the resource constraints of edge devices restrict the deployment of complex diagnostic models. To address these challenges, we propose a federated learning hybrid dynamic weight adjustment method based on delay and model quality, introducing the concept of “accelerated depreciation” in accounting and taxation and the concept of “asset allocation” in economics to improve the communication efficiency of fault diagnosis and reduce the impact of delay differences due to device heterogeneity on the effect of fault diagnosis. Additionally, we propose an adaptive sparse low high frequencies Transformer, introducing a lightweight attention mechanism and an adaptive feature extraction layer, which significantly reduces the computational overhead while maintaining high diagnostic accuracy. The experimental results show that, compared with the most competitive baseline, our method improves the fault diagnosis accuracy by 1% on the Case Western Reserve University Bearing dataset (CWRU), 0.78% on the Xi’an Jiaotong University Gearbox dataset (XJTU), and 0.44% on the Micro service Edge Computing dataset (MICRO).
Jingting Mei, Yang Yang, Celimuge Wu et al.· IEEE Transactions on Cogniti...· 0 citations
With the rapid development of computer and network technology, network and software logs generated by a multitude of devices contain a wealth of knowledge and serve as a critical resource for intelligent fault diagnosis and efficient system operations. In recent years, various deep learning methods and the pre-training and fine-tuning paradigm of large language models have achieved significant success in log understanding. However, most existing approaches directly adapt models designed for natural language, overlooking the unique characteristics inherent to log data, such as its distinct vocabulary distribution, structural patterns, and semantic expressions. Concurrently, some template-based methods lack flexibility and are limited in their ability to mine deep semantic information. Therefore, we propose LogPISA, an improved pre-training and tuning pipeline for log understanding with invariant and semantic-aware objectives. Our framework employs a hybrid attention mechanism, combining standard self-attention with our novel Keyword-Aware Sparse Attention to enable the model to capture critical signals more efficiently. During the pre-training phase, we introduce two innovative self-supervised tasks: a non-contrastive learning task based on permutation invariance to capture the flexible ordering within log blocks, and a contrastive learning task based on log summarization to guide the model to focus on core semantics over superficial textual forms. Experimental results on several public benchmarks demonstrate that our model achieves excellent performance on downstream anomaly detection tasks. This validates that our proposed framework learns more robust and generalizable log representations, providing a high-quality representational foundation for various downstream log analysis tasks.
Lanlan Rui, Yuan-Rui Yang, Peng Yu et al.· IEEE Transactions on Network...· 0 citations
Root cause localization is critical for ensuring service reliability in cloud-edge collaborative microservice systems. In practical scenarios, multiple microservice systems are often hybrid-deployed on shared infrastructure, which poses three challenges for existing methods. First, concurrent systems generate substantial metric noise that interferes with anomaly detection. Second, the hierarchical dependencies spanning cloud, edge, and terminal layers cannot be accurately represented in Euclidean space. Third, gateway services that aggregate traffic from multiple systems exhibit amplified anomaly signals, leading to systematic false alarms. To address these issues, we propose confidence gated agent root cause localization (CGARCL), a framework that integrates hyperbolic geometry with confidence gated agent reasoning. CGARCL consists of three components. The direction constrained budgeted anomaly detection method incorporates baseline robust scoring and temporal continuity constraints to extract high-quality candidate anomalous nodes from noisy metrics. The hyperbolic constrained spatio-temporal graph attention network employs Poincar’e ball mapping and center-based topology aggregation to accurately encode hierarchical service dependencies and generate initial root cause rankings. The confidence gated reranking agent is activated when the score gap between the top two candidates is small or the top-ranked node matches a victim-prone pattern. It then performs structured prompt reasoning to suppress false alarms and produce a refined ranking. Experiments on three cloud-edge collaborative microservices datasets demonstrate that CGARCL achieves ACC@1 of 62.1%, 70.6%, and 73.4%, outperforming the second best approach by 19.1%, 11.4%, and 9.8%.
Yechen He, Yang Yang, Lanlan Rui et al.· IEEE Transactions on Cogniti...· 0 citations
Cloud service platforms are increasingly extended to cloud-edge continua to support latency-sensitive and computation-intensive applications. In such distributed service environments, heterogeneous and time-varying compute capacity across edge sites creates strong competition among users, making it difficult to jointly achieve low delay and energy consumption, sustainable provider profit, and fair resource sharing. Although existing studies have investigated efficiency optimization, pricing mechanisms, and fairness-aware resource allocation, the joint coordination of adaptive pricing incentives and long-term fairness in dynamic multi-agent cloud-edge systems remains insufficiently explored. To address this issue, we develop a fairness-aware pricing and service-routing framework for multi-user multisite cloud-edge systems, and propose a heterogeneous multiagent learning method in which user agents learn service-routing decisions while service-node agents jointly adapt pricing and CPU-allocation policies under a fairness-aware utility design. The resulting coupled decision process is formulated as a Multi-Agent Markov Decision Process and implemented using a Multi-Agent Actor-Critic framework under centralized training and decentralized execution. Simulation results show that the proposed method reduces p95 delay and worst-user delay by up to 39.1% and 52.9%, respectively, while improving provider-side profit by up to 59.5% relative to the strongest competing baselines.
Yun Xia, Gang Zhou, Lirui Pan et al.· IEEE International Conferenc...· 0 citations
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