human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "software defined networking state of the art and research challenges"
  Abstract: Plug-and-play information technology (IT) infrastructure has been expanding very rapidly in recent years. With the advent of cloud computing, many ecosystem and business paradigms are encountering potential changes and may be able to eliminate their IT infrastructure maintenance processes. Real-time performance and high availability requirements have induced telecom networks to adopt the new concepts of the cloud model: software-defined networking (SDN) and network function virtualization (NFV). NFV introduces and deploys new network functions in an open and standardized IT environment, while SDN aims to transform the way networks function. SDN and NFV are complementary technologies; they do not depend on each other. However, both concepts can be merged and have the potential to mitigate the challenges of legacy networks. In this paper, our aim is to describe the benefits of using SDN in a multitude of environments such as in data centers, data center networks, and Network as Service offerings. We also present the various challenges facing SDN, from scalability to reliability and security concerns, and discuss existing solutions to these challenges.

Connected through hyperedge HE-1 (induced by source paper "addressing the challenges in federating edge resources"):
  with members:
    - "online learning for offloading and autoscaling in energy harvesting mobile edge computing"
    - "enorm a framework for edge node resource management"
    - "edge as a service towards distributed cloud architectures"
    - "challenges and opportunities in edge computing"
    - "dynamic service migration in mobile edge clouds"

Connected through hyperedge HE-2 (induced by source paper "sdn based qos provision in wsn technologies"):
  with members:
    - "towards internet of things iots integration of wireless sensor network to cloud services for data collection and sharing"

Connected through hyperedge HE-3 (induced by source paper "recent advances in cloud radio access networks system architectures key techniques and open issues"):
  with members:
    - "fronthaul compression and precoding design for c rans over ergodic fading channels"
    - "optimal fronthaul quantization for cloud radio positioning"
    - "inter tier interference suppression in heterogeneous cloud radio access networks"
    - "contract based interference coordination in heterogeneous cloud radio access networks"
    - "are heterogeneous cloud based radio access networks cost effective"
    - "energy efficient resource assignment and power allocation in heterogeneous cloud radio access networks"
    - "cooperative interference mitigation and handover management for heterogeneous cloud small cell networks"
    - "fronthaul constrained cloud radio access networks insights and challenges"

Connected through hyperedge HE-4 (induced by source paper "survey on network virtualization hypervisors for software defined networking"):
  with members:
    - "network function virtualization state of the art and research challenges"
    - "wireless sensor network virtualization a survey"
    - "nfv based gateways for virtualized wireless sensor networks a case study"
    - "software defined and virtualized future mobile and wireless networks a survey"
    - "software defined networking a comprehensive survey"
    - "nfv state of the art challenges and implementation in next generation mobile networks vepc"
    - "scalability and resilience of software defined networking an overview"
    - "disco distributed multi domain sdn controllers"

Connected through hyperedge HE-5 (induced by source paper "reinforcement learning for resource provisioning in the vehicular cloud"):
  with members:
    - "nfv state of the art challenges and implementation in next generation mobile networks vepc"
    - "toward cloud based vehicular networks with efficient resource management"
    - "resource allocation in a network based cloud computing environment design challenges"

Connected through hyperedge HE-6 (induced by source paper "reconfigurable wireless networks"):
  with members:
    - "coverage and rate analysis for millimeter wave cellular networks"
    - "enhanced pilot based spectrum sensing algorithm"
    - "millimeter wave cellular wireless networks potentials and challenges"
    - "multiband spectrum access great promises for future cognitive radio networks"
    - "scaling up mimo opportunities and challenges with very large arrays"
    - "multi user mimo scheduling in the fourth generation cellular uplink"
    - "optimal multiband joint detection for spectrum sensing in cognitive radio networks"
    - "femtocell networks a survey"

Connected through hyperedge HE-7 (induced by source paper "network issues in virtual machine migration"):
  with members:
    - "nfv state of the art challenges and implementation in next generation mobile networks vepc"

Connected through hyperedge HE-8 (induced by source paper "nfv state of the art challenges and implementation in next generation mobile networks vepc"):
  with members:
    - "resource allocation in a network based cloud computing environment design challenges"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.NI(Networking and Internet Architecture)