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: "probabilistic omnidirectional path loss models for millimeter wave outdoor communications"
  Abstract: This letter presents a probabilistic omnidirectional millimeter-wave path loss model based on real-world 28 GHz and 73 GHz measurements collected in New York City. The probabilistic path loss approach uses a free space line-of-sight propagation model, and for non-line-of-sight conditions uses either a close-in free space reference distance path loss model or a floating-intercept path loss model. The probabilistic model employs a weighting function that specifies the line-of-sight probability for a given transmitter-receiver separation distance. Results show that the probabilistic path loss model offers virtually identical results whether one uses a non-line-of-sight close-in free space reference distance path loss model, with a reference distance of 1 meter, or a floating-intercept path loss model. This letter also shows that site-specific environmental information may be used to yield the probabilistic weighting function for choosing between line-of-sight and non-line-of-sight conditions.

Connected through hyperedge HE-1 (induced by source paper "early acceptance matching game for user association in 5g cellular hetnet"):
  with members:
    - "load balancing user association in millimeter wave mimo networks"
    - "matching theory for priority based cell association in the downlink of wireless small cell networks"
    - "optimal user cell association for massive mimo wireless networks"
    - "user association for load balancing in heterogeneous cellular networks"

Connected through hyperedge HE-2 (induced by source paper "load balancing user association in millimeter wave mimo networks"):
  with members:
    - "time fractional user association in millimeter wave mimo networks"
    - "downlink cell association and load balancing for joint millimeter wave microwave cellular networks"
    - "large scale convex optimization for ultra dense cloud ran"
    - "a survey of millimeter wave mmwave communications for 5g opportunities and challenges"
    - "heterogeneous cloud radio access networks a new perspective for enhancing spectral and energy efficiencies"
    - "optimal user cell association for massive mimo wireless networks"
    - "distributed linear precoder optimization and base station selection for an uplink heterogeneous network"
    - "millimeter wave channel modeling and cellular capacity evaluation"

Connected through hyperedge HE-3 (induced by source paper "time fractional user association in millimeter wave mimo networks"):
  with members:
    - "a survey of millimeter wave mmwave communications for 5g opportunities and challenges"
    - "optimal user cell association for massive mimo wireless networks"
    - "spatially sparse precoding in millimeter wave mimo systems"
    - "distributed linear precoder optimization and base station selection for an uplink heterogeneous network"

Connected through hyperedge HE-4 (induced by source paper "overview of millimeter wave communications for fifth generation 5g wireless networks with a focus on propagation models"):
  with members:
    - "indoor office wideband penetration loss measurements at 73 ghz"
    - "study on 3gpp rural macrocell path loss models for millimeter wave wireless communications"
    - "investigation and comparison of 3gpp and nyusim channel models for 5g wireless communications"
    - "millimeter wave small scale spatial statistics in an urban microcell scenario"
    - "a novel millimeter wave channel simulator and applications for 5g wireless communications"
    - "small scale local area and transitional millimeter wave propagation for 5g communications"
    - "5g 3gpp like channel models for outdoor urban microcellular and macrocellular environments"
    - "millimeter wave human blockage at 73 ghz with a simple double knife edge diffraction model and extension for directional antennas"

Connected through hyperedge HE-5 (induced by source paper "improved handover through dual connectivity in 5g mmwave mobile networks"):
  with members:
    - "adaptive beamwidth selection for contention based access periods in millimeter wave wlans"
    - "performance comparison of dual connectivity and hard handover for lte 5g tight integration"
    - "channel dynamics and snr tracking in millimeter wave cellular systems"
    - "transport layer performance in 5g mmwave cellular"
    - "a framework for end to end evaluation of 5g mmwave cellular networks in ns 3"
    - "multi connectivity in 5g mmwave cellular networks"
    - "uplink based framework for control plane applications in 5g mmwave cellular networks"
    - "comparative analysis of initial access techniques in 5g mmwave cellular networks"

Connected through hyperedge HE-6 (induced by source paper "interference modeling for cellular networks under beamforming transmission"):
  with members:
    - "understanding noise and interference regimes in 5g millimeter wave cellular networks"
    - "gaussian approximation for the downlink interference in heterogeneous cellular networks"
    - "coverage in heterogeneous downlink millimeter wave cellular networks"
    - "a stochastic geometry framework for analyzing pairwise cooperative cellular networks"
    - "a survey of millimeter wave mmwave communications for 5g opportunities and challenges"
    - "analysis of a cooperative strategy for a large decentralized wireless network"
    - "coverage and rate analysis for millimeter wave cellular networks"
    - "uplink user assisted relaying in cellular networks"

Connected through hyperedge HE-7 (induced by source paper "inter operator resource management for millimeter wave multi hop backhaul networks"):
  with members:
    - "user association in 5g networks a survey and an outlook"
    - "5g ultra dense cellular networks"
    - "joint deployment of small cells and wireless backhaul links in next generation networks"
    - "matching theory for backhaul management in small cell networks with mmwave capabilities"
    - "tractable model for rate in self backhauled millimeter wave cellular networks"
    - "distributed resource allocation in device to device enhanced cellular networks"
    - "matching theory for future wireless networks fundamentals and applications"
    - "millimeter wave cellular wireless networks potentials and challenges"

Connected through hyperedge HE-8 (induced by source paper "investigation and comparison of 3gpp and nyusim channel models for 5g wireless communications"):
  with members:
    - "millimeter wave mimo channel estimation based on adaptive compressed sensing"
    - "a novel millimeter wave channel simulator and applications for 5g wireless communications"
    - "overview of millimeter wave communications for fifth generation 5g wireless networks with a focus on propagation models"
    - "investigation of prediction accuracy sensitivity and parameter stability of large scale propagation path loss models for 5g wireless communications"
    - "a prediction study of path loss models from 2 73 5 ghz in an urban macro environment"
    - "local multipath model parameters for generating 5g millimeter wave 3gpp like channel impulse response"
    - "limited feedback hybrid precoding for multi user millimeter wave systems"
    - "synthesizing omnidirectional antenna patterns received power and path loss from directional antennas for 5g millimeter wave communications"

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.IT(Information Theory)