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Open research questions in Software-Defined Networks and 5G

87 gap statements mined from Software-Defined Networks and 5G papers in our 4.5M-paper local library, which holds 697 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • For future work, we aim to improve trajectory prediction accuracy using advanced deep learning techniques, adopt adaptive machine learning algorithms for controller placement, and address key challenges such as scalability for city-wide deployments and integration with 5G/6G network infrastructures.

    MOTA-SVB: A Novel Multi-Objective Trajectory-Aware SDN Controller Placement in Vehicular Networks for Byzantine Fault Tolerance · 2026 · DOI

  • The first challenge is data fragmentation. Many networks still expose heterogeneous schemas, incompatible telemetry streams, and inconsistent timing granularity. Without a unified data model, AI decisions may be based on incomplete or conflicting information. The second challenge is trust and explainability. Operators are unlikely to fully delegate control of mission-critical services to opaque models.

    AI-Augmented Cross-Domain Resource Orchestration in Next-Generation Mobile Networks · 2026 · DOI

  • Energy-efficient routing in large-scale IIoT systems is a challenge due to resource limitations and dynamic network environments. Existing methods have limitations in terms of energy efficiency and scalability.

    Distributed SDN for energy-efficient routing in large-scale IIoT using sculptor dream optimization-based deep learning · 2026 · DOI

  • Future work will focus on extending the evaluation of the proposed framework beyond simulation by incorporating real-world datasets, testbed implementations, and practical deployment scenarios to enhance its credibility and applicability.

    Intelligent Deep Learning-aided Malicious Node Detection and Encrypted Routing Optimization in Software-Defined Networking · 2026 · DOI

  • Recovery exercises conducted annually — the standard practice in traditional DR programs — are insufficient to maintain operational confidence in infrastructure and application cloud DR environments where configurations change continuously.

    SASE-Based Enterprise Architecture Modernization Through Secure IT/OT Convergence and Edge-Driven Automation in Industrial Environments · 2026 · DOI

  • Ongoing and future research endeavors are focused on the fusion of the proposed hybrid NDT identification methodology in motion planning applications, where the explainability, adaptability, data efficiency, and compressed information rate properties could lead to a combined communication-aware motion planning approach.

    Learning a network digital twin as a hybrid system · 2026 · DOI

  • It highlights the need for a holistic perspective that integrates technical analyses with organizational and practical considerations.

    Hexagonal Architecture for Maintainable Applications · 2026 · DOI

  • The gap in existing research is the need for a holistic perspective that integrates technical analyses with organizational and practical considerations. The study identifies the need for more secure systems that incorporate cybersecurity measures from the inception of the design.

    Serverless Architecture: Patterns and Pitfalls · 2026 · DOI

  • The study highlights the need for a holistic perspective on the design, implementation, and evaluation of robust solutions for contemporary security and architectural challenges. The paper addresses the lack of integration of cybersecurity measures with architectural design.

    Space-Based Architecture for Distributed Systems · 2026 · DOI

  • When switch memory is scarce, the JCT performance ordering follows EDT, spatial multiplexing, and temporal multiplexing, with temporal multiplexing achieving the lowest JCT due to its more flexible allocation of switch resources.

    EPIC: Abstraction and Polymorphism of In-Network Collectives on Ethernet · 2026

  • Static pathfinding algorithms have limitations in large-scale OHT systems. Existing RL approaches suffer from scalability issues.

    Lightweight Probabilistic RL for Web-app Compatible Large-scale OHT Path Optimization · 2026 · DOI

  • The lack of understanding of how multi-agent orchestration performs in decentralized network protocol configuration. The need for a protocol-centered account of when agentic orchestration helps and when it adds coordination cost.

    Agentic Patterns for Decentralized Network Protocol Configuration · 2026 · DOI

  • Continuous monitoring is therefore essential, yet monitoring resources are limited. This work demonstrates that effective SLA-aware slice monitoring requires both adaptive control-plane mechanisms and suitable data-plane primitives.

    Dynamic SLA-aware Network Slice Monitoring · 2026 · DOI

  • The need for deterministic memory management in highly resource-constrained edge hardware. The lack of a state-of-the-art framework for untrusted, massive-scale federated learning and autonomous spatial mapping.

    Optimizing Sovereign Edge Processing and Byzantine Fault Tolerance · 2026 · DOI

  • Future research can focus on optimizing the cryptographic overhead to achieve sub-1 ms round-trip times.

    Evaluation of Security-Induced Latency on 5G RAN Interfaces and User Plane Communication · 2026 · DOI

  • The lack of effective mitigation strategies for RRC signaling storms. The inability of existing defenses to discern between high-load network conditions and attacks. The need for a fingerprint-based detection and mitigation approach.

    StormShield: Fingerprint-Based Detection and Mitigation of RRC Signaling Storms in O-RAN 5G RANs · 2026 · DOI

  • The paper identifies a need for a comprehensive guide for SD-WAN solutions. It seeks to provide a detailed overview of SD-WAN technology and its applications.

    Palo Alto Networks Palo Alto Networks SD-WAN-Engineer PDF · 2026 · DOI

  • The findings demonstrate that traditional geometric clustering metrics alone are insufficient for evaluating operationally meaningful QoS regimes.

    Learning Hidden QoS Structures in Cellular Networks: A Context-Aware Benchmark of Unsupervised Clustering Methods with a New QoS Cluster Validity Protocol · 2026 · DOI

  • This research presented EASE-6G, a multi-layered, energy-aware networking platform designed to address the scaling challenges inherent to 6G-IoT deployments. By merging the targeted temporal awareness of the LSTM with decision logic governed through a signaling-sensitive DQN, this work demonstrates that predictive SDN control can significantly reduce energy footprints.

    EASE-6G: An Energy-Aware SDN Framework with Proactive Slicing and DL-Based Overhead Mitigation for Scalable IoT Networks · 2026 · DOI

  • Future research will address the limitations identified in Section 7 by moving from Watts–Strogatz simulation to closed-loop hardware deployment with Zolertia RE-Mote nodes running Contiki-NG. This approach will enable empirical validation of energy models and allow quantification of battery overhead associated with federated synchronization.

    FedCARE: Fuzzy-Supervised Federated Inference with Confidence Gating for Resilient IIoT Sensor Networks · 2026 · DOI

  • The authors note that achieving sub-1 ms round-trip times remains challenging due to cryptographic overhead.

    Evaluation of Security-Induced Latency on 5G RAN Interfaces and User Plane Communication · 2026 · DOI

  • To explore the use of other blockchain networks and smart contract platforms. To investigate the application of NFT-Cert-MN in various industries and use cases. To conduct a more comprehensive evaluation of the proposed framework.

    The NFT Transition for Certificates of Mobile Network · 2026 · DOI

  • Configuration changes pose unique challenges for code review, - The complexity of SDN configurations, - The need for careful review of configuration changes to mitigate latent…

    Do SDN configuration changes get reviewed differently? An empirical study at TELUS · 2026 · DOI

  • The lack of understanding of how configuration changes in SDN systems are reviewed, - The need for a systematic study of the differences between configuration, development, and documentation-related changes, - The importance of informing review practices for configuration changes in SDN…

    Do SDN configuration changes get reviewed differently? An empirical study at TELUS · 2026 · DOI

  • Defining lightweight and scalable special congestion notification message formats. Evaluating interaction with existing congestion control protocols. Quantifying performance gains through broad-scale simulations and real testbeds.

    AN ENHANCED ECN-BASED CONGESTION MITIGATION WITH TRAFFIC REROUTING FOR CLOS DATA CENTER NETWORKS · 2026 · DOI

Most-cited papers in Software-Defined Networks and 5G

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Open questions raised by papers listed on this page include: (1) Future work will focus on extending the evaluation of the proposed framework beyond simulation by incorporating real-world datasets, testbed implementations, and practical deployment scenarios to enhance its credibility and applicability (“Intelligent Deep Learning-aided Malicious Node Detection and Encrypted Routing…”, 2026); (2) The paper addresses the lack of integration of cybersecurity measures with architectural design (“Space-Based Architecture for Distributed Systems”, 2026); (3) The lack of understanding of how multi-agent orchestration performs in decentralized network protocol configuration (“Agentic Patterns for Decentralized Network Protocol Configuration”, 2026); (4) The lack of a state-of-the-art framework for untrusted, massive-scale federated learning and autonomous spatial mapping (“Optimizing Sovereign Edge Processing and Byzantine Fault Tolerance”, 2026); (5) Future research can focus on optimizing the cryptographic overhead to achieve sub-1 ms round-trip times (“Evaluation of Security-Induced Latency on 5G RAN Interfaces and User Plane…”, 2026). 87 gap statements have been mined from Software-Defined Networks and 5G papers in our 4.5M-paper local library, which holds 697 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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