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: "octopus a cooperative hierarchical caching strategy for cloud radio access networks"
  Abstract: Recently, implementing Radio Access Network (RAN) functionalities on cloud-based computing platform has become an emerging solution that leverages the many advantages of cloud infrastructure, such as shared computing resources and storage capacity, while lowering the operational cost. In this paper, we propose a novel caching framework aimed at fully exploiting the potential of such Cloud-based RAN (C-RAN) systems through cooperative hierarchical caching which minimizes the network costs of content delivery and improves users' Quality of Experience (QoE). In particular, we consider the cloud-cache in the cloud processing unit (CPU) as a new layer in the RAN cache hierarchy, bridging the capacity-performance gap between the traditional edge-based and core-based caching schemes. A delay cost model is introduced to characterize and formulate the cache placement optimization problem, which is shown to be NP-complete. As such, a low complexity, heuristic cache management strategy is proposed, constituting of a proactive cache distribution algorithm and a reactive cache replacement algorithm. Extensive numerical simulations are carried out using both real-world YouTube video requests and synthetic content requests. It is demonstrated that our proposed Octopus caching strategy significantly outperforms the traditional caching strategies in terms of cache hit ratio, average content access delay and backhaul traffic load.

Connected through hyperedge HE-1 (induced by source paper "full duplex enabled mobile edge caching from distributed to cooperative caching"):
  with members:
    - "modeling and performance analysis of full duplex communications in cache enabled d2d networks"
    - "fundamental tradeoff between storage and latency in cache aided wireless interference networks"
    - "edge caching wireless networks performance analysis and optimization"
    - "cache aided full duplex small cells"
    - "delivery time minimization in edge caching synergistic benefits of subspace alignment and zero forcing"
    - "wireless device to device caching networks basic principles and system performance"
    - "wireless content caching for small cell and d2d networks"
    - "energy efficiency of downlink networks with caching at base stations"

Connected through hyperedge HE-2 (induced by source paper "joint functional splitting and content placement for green hybrid cran"):
  with members:
    - "collaborative mobile edge computing in 5g networks new paradigms scenarios and challenges"
    - "beyond the ultra dense barrier paradigm shifts on the road beyond 1000x wireless capacity"
    - "heterogeneous cloud radio access networks a new perspective for enhancing spectral and energy efficiencies"

Connected through hyperedge HE-3 (induced by source paper "liquid state machine learning for resource and cache management in lte u unmanned aerial vehicle uav networks"):
  with members:
    - "beyond 5g with uavs foundations of a 3d wireless cellular network"
    - "uav aided offloading for cellular hotspot"
    - "joint altitude beamwidth location and bandwidth optimization for uav enabled communications"
    - "wireless communication using unmanned aerial vehicles uavs optimal transport theory for hover time optimization"
    - "echo state networks for self organizing resource allocation in lte u with uplink downlink decoupling"
    - "joint trajectory and communication design for multi uav enabled wireless networks"
    - "virtual reality over wireless networks quality of service model and learning based resource management"
    - "uav air to ground channel characterization for mmwave systems"

Connected through hyperedge HE-4 (induced by source paper "edge caching wireless networks energy efficient design and optimization"):
  with members:
    - "coded multicast fronthauling and edge caching for multi connectivity transmission in fog radio access networks"
    - "wireless device to device caching networks basic principles and system performance"
    - "wireless content caching for small cell and d2d networks"
    - "cooperative caching and transmission design in cluster centric small cell networks"
    - "joint caching routing and channel assignment for collaborative small cell cellular networks"
    - "content centric sparse multicast beamforming for cache enabled cloud ran"
    - "cache aided wireless networks tradeoffs between storage and latency"
    - "analysis on cache enabled wireless heterogeneous networks"

Connected through hyperedge HE-5 (induced by source paper "cooperative edge caching in user centric clustered mobile networks"):
  with members:
    - "cost effective cache deployment in mobile heterogeneous networks"
    - "policy optimization for content push via energy harvesting small cells in heterogeneous networks"
    - "on optimal geographical caching in heterogeneous cellular networks"
    - "on the delay of geographical caching methods in two tiered heterogeneous networks"
    - "mobility aware caching for content centric wireless networks modeling and methodology"
    - "caching placement in stochastic wireless caching helper networks channel selection diversity via caching"
    - "cooperative caching and transmission design in cluster centric small cell networks"
    - "joint caching routing and channel assignment for collaborative small cell cellular networks"

Connected through hyperedge HE-6 (induced by source paper "understanding the computational requirements of virtualized baseband units using a programmable cloud radio access network testbed"):
  with members:
    - "cloud based deep learning of big eeg data for epileptic seizure prediction"
    - "dynamic radio cooperation for downlink cloud rans with computing resource sharing"

Connected through hyperedge HE-7 (induced by source paper "echo state networks for proactive caching in cloud based radio access networks with mobile users"):
  with members:
    - "echo state networks for self organizing resource allocation in lte u with uplink downlink decoupling"
    - "joint millimeter wave fronthaul and ofdma resource allocation in ultra dense cran"
    - "optimal fronthaul quantization for cloud radio positioning"
    - "recent advances in cloud radio access networks system architectures key techniques and open issues"
    - "joint wireless fronthaul and ofdma resource allocation in ultra dense cran"
    - "mobility aware caching for content centric wireless networks modeling and methodology"
    - "cluster content caching an energy efficient approach to improve quality of service in cloud radio access networks"
    - "caching improvement using adaptive user clustering"

Connected through hyperedge HE-8 (induced by source paper "joint caching and pricing strategies for popular content in information centric networks"):
  with members:
    - "echo state networks for proactive caching in cloud based radio access networks with mobile users"
    - "wireless device to device caching networks basic principles and system performance"
    - "a learning based approach to caching in heterogenous small cell networks"
    - "a stackelberg game for incentive proactive caching mechanisms in wireless networks"
    - "collaborative multi bitrate video caching and processing in mobile edge computing networks"
    - "big data meets telcos a proactive caching perspective"
    - "cooperative hierarchical caching in 5g cloud radio access networks c rans"
    - "mean field games for distributed caching in ultra dense small cell networks"

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)