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: "design aspects of short range millimeter wave networks a mac layer perspective"
  Abstract: Increased density of wireless devices, ever growing demands for extremely high data rate, and spectrum scarcity at microwave bands make the millimeter wave (mmWave) frequencies an important player in future wireless networks. However, mmWave communication systems exhibit severe attenuation, blockage, deafness, and may need microwave networks for coordination and fall-back support. To compensate for high attenuation, mmWave systems exploit highly directional operation, which in turn substantially reduces the interference footprint. The significant differences between mmWave networks and legacy communication technologies challenge the classical design approaches, especially at the medium access control (MAC) layer, which has received comparatively less attention than PHY and propagation issues in the literature so far. In this paper, the MAC layer design aspects of short range mmWave networks are discussed. In particular, we explain why current mmWave standards fail to fully exploit the potential advantages of short range mmWave technology, and argue for the necessity of new collision-aware hybrid resource allocation frameworks with on-demand control messages, the advantages of a collision notification message, and the potential of multihop communication to provide reliable mmWave connections.

Connected through hyperedge HE-1 (induced by source paper "mac protocols for terahertz communication a comprehensive survey"):
  with members:
    - "on the reliability of wireless virtual reality at terahertz thz frequencies"
    - "a tutorial on beam management for 3gpp nr at mmwave frequencies"
    - "on unified vehicular communications and radar sensing in millimeter wave and low terahertz bands"
    - "survey on terahertz nanocommunication and networking a top down perspective"
    - "end to end simulation of 5g mmwave networks"
    - "wireless terahertz system architectures for networks beyond 5g"
    - "terahertz technologies to deliver optical network quality of experience in wireless systems beyond 5g"
    - "slotted csma ca based energy efficient mac protocol design in nanonetworks"

Connected through hyperedge HE-2 (induced by source paper "ieee 802 11ay based mmwave wlans design challenges and solutions"):
  with members:
    - "performance analysis of integrated sub 6 ghz millimeter wave wireless local area networks"
    - "beamspace su mimo for future millimeter wave wireless communications"
    - "ieee 802 11ax high efficiency wlans"
    - "initial access in 5g mmwave cellular networks"
    - "flexible dual connectivity spectrum aggregation for decoupled uplink and downlink access in 5g heterogeneous systems"
    - "joint millimeter wave and microwave resources allocation in cellular networks with dual mode base stations"
    - "reciprocity calibration for massive mimo proposal modeling and validation"
    - "beam searching and transmission scheduling in millimeter wave communications"

Connected through hyperedge HE-3 (induced by source paper "dual sub 6 ghz millimeter wave beamforming and communications to achieve low latency and high energy efficiency in 5g systems"):
  with members:
    - "modeling and analyzing millimeter wave cellular systems"
    - "millimeter wave beam selection using out of band spatial information"
    - "hybrid architectures with few bit adc receivers achievable rates and energy rate tradeoffs"
    - "millimeter wave cellular wireless networks potentials and challenges"
    - "joint spatial division and multiplexing for mm wave channels"

Connected through hyperedge HE-4 (induced by source paper "energy efficiency and sum rate tradeoffs for massive mimo systems with underlaid device to device communications"):
  with members:
    - "massive mimo ten myths and one critical question"
    - "energy efficiency and sum rate when massive mimo meets device to device communication"
    - "an analytical framework for device to device communication in cellular networks"
    - "energy efficient resource allocation for device to device underlay communication"
    - "the interplay between massive mimo and underlaid d2d networking"
    - "optimal multiuser transmit beamforming a difficult problem with a simple solution structure"
    - "spectrum sharing for device to device communication in cellular networks"
    - "multiobjective signal processing optimization the way to balance conflicting metrics in 5g systems"

Connected through hyperedge HE-5 (induced by source paper "millimeter wave cellular networks a mac layer perspective"):
  with members:
    - "stochastic geometry modeling and analysis of multi tier millimeter wave cellular networks"
    - "beam searching and transmission scheduling in millimeter wave communications"
    - "a survey of millimeter wave mmwave communications for 5g opportunities and challenges"
    - "subspace estimation and decomposition for hybrid analog digital millimetre wave mimo systems"
    - "on the joint impact of beamwidth and orientation error on throughput in directional wireless poisson networks"
    - "an overview of load balancing in hetnets old myths and open problems"
    - "channel estimation and hybrid precoding for millimeter wave cellular systems"
    - "massive mimo for next generation wireless systems"

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)