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: "operational region of d2d communications for enhancing cellular network performance"
  Abstract: An important enabler towards the successful deployment of any new element/feature to the cellular network is the investigation and characterization of the operational conditions where its introduction will enhance performance. Although there has been significant research activity on the potential of device-to-device (D2D) communications, there are currently no clear indications of whether D2D communications are actually able to provide benefits for a  wide range  of operational conditions, thus justifying their introduction to the system. This paper attempts to fill this gap by taking a stochastic geometry approach on characterizing the set (region) of operational conditions for which D2D communications enhance performance in terms of average user rate. For the practically interesting case of a heavy-loaded network, the operational region is provided in closed form as a function of a variety of parameters such as maximum D2D link distances and user densities, reflecting a wide range of operational conditions (points). It is shown that, under the appropriate deployment scheme, D2D communications can indeed be beneficial not only for the usually considered regime of “proximal communications” but to a wide range of operational conditions that include D2D link distances comparable to the distance to the cellular access point and considerably large user densities.

Connected through hyperedge HE-1 (induced by source paper "d2d multicast in underlay cellular networks with exclusion zones"):
  with members:
    - "optimal resource allocation in multicast device to device communications underlaying lte networks"
    - "a stochastic geometric analysis of device to device communications operating over generalized fading channels"
    - "poisson hole process theory and applications to wireless networks"
    - "modeling cellular networks with full duplex d2d communication a stochastic geometry approach"
    - "an analytical framework for device to device communication in cellular networks"
    - "device to device communication underlaying a finite cellular network region"
    - "spectrum sharing for device to device communication in cellular networks"
    - "what will 5g be"

Connected through hyperedge HE-2 (induced by source paper "cross mode interference characterization in cellular networks with voronoi guard regions"):
  with members:
    - "user point processes in cellular networks"
    - "the intensity matching approach a tractable stochastic geometry approximation to system level analysis of cellular networks"
    - "poisson hole process theory and applications to wireless networks"
    - "modeling cellular networks with full duplex d2d communication a stochastic geometry approach"
    - "decentralized opportunistic access for d2d underlaid cellular networks"
    - "an analytical framework for device to device communication in cellular networks"
    - "throughput analysis for full duplex wireless networks with imperfect self interference cancellation"
    - "on stochastic geometry modeling of cellular uplink transmission with truncated channel inversion power control"

Connected through hyperedge HE-3 (induced by source paper "device to device communication underlaying a finite cellular network region"):
  with members:
    - "performance analysis of arbitrarily shaped underlay cognitive networks effects of secondary user activity protocols"
    - "an analytical framework for device to device communication in cellular networks"
    - "on fundamental trade offs of device to device communications in large wireless networks"
    - "a geometrical based throughput bound analysis for device to device communications in cellular networks"
    - "renewable powered cellular networks energy field modeling and network coverage"
    - "a survey on device to device communication in cellular networks"
    - "downlink cellular network analysis with multi slope path loss models"
    - "spectrum sharing for device to device communication 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.IT(Information Theory)