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: "hybrid millimeter wave systems a novel paradigm for hetnets"
  Abstract: Heterogeneous networks, HetNets, are known to enhance the bandwidth efficiency and throughput of wireless networks by more effectively utilizing the network resources. However, the higher density of users and access points in HetNets introduces significant inter-user interference that needs to be mitigated through complex and sophisticated interference cancellation schemes. Moreover, due to significant channel attenuation and the presence of hardware impairments, e.g. phase noise and amplifier nonlinearities, the vast bandwidth in the millimeterwave band has not been fully utilized to date. In order to enable the development of multi-Gigabit per second wireless networks, we introduce a novel millimeter-wave HetNet paradigm, termed hybrid HetNet, which exploits the vast bandwidth and propagation characteristics in the 60 GHz and 70–80 GHz bands to reduce the impact of interference in HetNets. Simulation results are presented to illustrate the performance advantage of hybrid HetNets with respect to traditional networks. Next, two specific transceiver structures that enable hand-offs from the 60 GHz band, i.e. the V-band to the 70–80 GHz band, i.e. the E-band, and vice versa are proposed. Finally, the practical and regulatory challenges for establishing a hybrid HetNet are outlined.

Connected through hyperedge HE-1 (induced by source paper "dual band fading multiple access relay channels"):
  with members:
    - "gaussian 1 2 1 networks capacity results for mmwave communications"
    - "secure communication over 1 2 1 networks"
    - "beam management for millimeter wave beamspace mu mimo systems"
    - "millimeter wave beam selection using out of band spatial information"
    - "downlink and uplink cell association with traditional macrocells and millimeter wave small cells"
    - "link regime and power savings of decode forward relaying in fading channels"
    - "joint millimeter wave and microwave resources allocation in cellular networks with dual mode base stations"

Connected through hyperedge HE-2 (induced by source paper "caching aided collaborative d2d operation for predictive data dissemination in industrial iot"):
  with members:
    - "on the temporal effects of mobile blockers in urban millimeter wave cellular scenarios"
    - "caching at the wireless edge design aspects challenges and future directions"
    - "living on the edge the role of proactive caching in 5g wireless networks"

Connected through hyperedge HE-3 (induced by source paper "a machine learning approach for power allocation in hetnets considering qos"):
  with members:
    - "a quantitative measure of fairness and discrimination for resource allocation in shared computer systems"

Connected through hyperedge HE-4 (induced by source paper "fundamental green tradeoffs progresses challenges and impacts on 5g networks"):
  with members:
    - "spectrum power trading for energy efficient small cell"
    - "power efficient resource allocation for full duplex radio distributed antenna networks"
    - "energy recycling full duplex radios for next generation networks"
    - "energy efficient resource allocation for wireless powered communication networks"
    - "multi objective optimization for robust power efficient and secure full duplex wireless communication systems"
    - "coexistence of wi fi and heterogeneous small cell networks sharing unlicensed spectrum"
    - "on the spectral efficiency of full duplex small cell wireless systems"
    - "filter bank multicarrier for massive mimo"

Connected through hyperedge HE-5 (induced by source paper "when mmwave communications meet network densification a scalable interference coordination perspective"):
  with members:
    - "downlink and uplink cell association with traditional macrocells and millimeter wave small cells"
    - "alternating minimization algorithms for hybrid precoding in millimeter wave mimo systems"
    - "delay and backlog analysis for 60 ghz wireless networks"
    - "device to device millimeter wave communications interference coverage rate and finite topologies"
    - "frequency selective hybrid precoding for limited feedback millimeter wave systems"
    - "channel estimation and hybrid precoding for millimeter wave cellular systems"
    - "coverage and rate analysis for millimeter wave cellular networks"
    - "what will 5g be"

Connected through hyperedge HE-6 (induced by source paper "context aware scheduling of joint millimeter wave and microwave resources for dual mode base stations"):
  with members:
    - "millimeter wave cellular networks a mac layer perspective"
    - "millimeter wave cellular wireless networks potentials and challenges"
    - "five disruptive technology directions for 5g"

Connected through hyperedge HE-7 (induced by source paper "a multiband ofdma heterogeneous network for millimeter wave 5g wireless applications"):
  with members:
    - "coverage and rate analysis for millimeter wave cellular networks"
    - "what will 5g be"
    - "joint subcarrier pairing and power allocation for ofdm transmission with decode and forward relaying"

Connected through hyperedge HE-8 (induced by source paper "a survey of millimeter wave mmwave communications for 5g opportunities and challenges"):
  with members:
    - "channel estimation and hybrid precoding for millimeter wave cellular systems"
    - "coverage and rate analysis for millimeter wave cellular networks"
    - "millimeter wave cellular wireless networks potentials and challenges"
    - "spatially sparse precoding in millimeter wave mimo systems"
    - "on the feasibility of beamforming in millimeter wave communication systems with multiple antenna arrays"
    - "suboptimal spatial diversity scheme for 60 ghz millimeter wave wlan"
    - "millimeter wave channel modeling and cellular capacity evaluation"
    - "coding the beams improving beamforming training in mmwave communication system"

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)