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: "effect of los nlos propagation on area spectral efficiency and energy efficiency of small cells"
  Abstract: In this paper we investigate the effect of Line-of-Sight (LOS) and Non-Line-of-Sight (NLOS) propagation on the Area Spectral Efficiency (ASE) and on the energy efficiency of dense small-cell networks. We show that including both LOS and NLOS propagation in the path-loss model provides a completely different picture of the behaviours of ASE and energy efficiency than what would be observed in case of either LOS or NLOS propagation only. In particular, with combined LOS/NLOS path-loss, the ASE exhibits superlinear and sublinear behaviour at low and high cell densities, respectively. In addition, the energy efficiency as a function of the cell density has a global maximum and is not a monotonically increasing function like in case of LOS or NLOS propagation only. Based on our findings, we claim that Line-of-Sight (LOS) and Non-Line-of-Sight (NLOS) propagations play an important role in studying the performance of extremely dense small-cell networks.

Connected through hyperedge HE-1 (induced by source paper "coverage analysis of 3 d dense cellular networks with realistic propagation conditions"):
  with members:
    - "downlink cellular network analysis with los nlos propagation and elevated base stations"
    - "sinr and throughput scaling in ultradense urban cellular networks"
    - "what will 5g be"
    - "a stochastic geometry framework for los nlos propagation in dense small cell networks"
    - "coverage and economy of cellular networks with many base stations"
    - "a tractable approach to coverage and rate in cellular networks"

Connected through hyperedge HE-2 (induced by source paper "radio access network and spectrum sharing in mobile networks a stochastic geometry perspective"):
  with members:
    - "a primer on cellular network analysis using stochastic geometry"
    - "resource sharing in 5g mmwave cellular networks"
    - "on spectrum and infrastructure sharing in multi operator cellular networks"
    - "poisson hole process theory and applications to wireless networks"
    - "gains of restricted secondary licensing in millimeter wave cellular systems"
    - "co primary multi operator resource sharing for small cell networks"
    - "technical rate of substitution of spectrum in future mobile broadband provisioning"
    - "on the feasibility of sharing spectrum licenses in mmwave cellular systems"

Connected through hyperedge HE-3 (induced by source paper "performance analysis of outdoor mmwave ad hoc networks"):
  with members:
    - "device to device millimeter wave communications interference coverage rate and finite topologies"
    - "stochastic geometry modeling of cellular networks analysis simulation and experimental validation"
    - "spectrum sharing for device to device communication in cellular networks"
    - "tractable model for rate in self backhauled millimeter wave cellular networks"
    - "coverage and rate analysis for millimeter wave cellular networks"
    - "analysis of blockage effects on urban cellular networks"
    - "power control for d2d underlaid cellular networks modeling algorithms and analysis"
    - "an overview of the transmission capacity of wireless networks"

Connected through hyperedge HE-4 (induced by source paper "impact of dual slope path loss on user association in hetnets"):
  with members:
    - "why to decouple the uplink and downlink in cellular networks and how to do it"
    - "performance impact of los and nlos transmissions in small cell networks"
    - "analysis of the decoupled access for downlink and uplink in wireless heterogeneous networks"
    - "downlink cellular network analysis with multi slope path loss models"
    - "an overview of load balancing in hetnets old myths and open problems"
    - "joint rate and sinr coverage analysis for decoupled uplink downlink biased cell associations in hetnets"
    - "coverage and rate analysis for millimeter wave cellular networks"
    - "millimeter wave cellular wireless networks potentials and challenges"

Connected through hyperedge HE-5 (induced by source paper "a stochastic geometry framework for los nlos propagation in dense small cell networks"):
  with members:
    - "downlink cellular network analysis with multi slope path loss models"
    - "analysis of blockage effects on urban cellular networks"
    - "a tractable approach to coverage and rate in cellular 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)