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: "asymptotic behavior of ultra dense cellular networks and its economic impact"
  Abstract: This paper investigates the relationship between base station (BS) density and average spectral efficiency (SE) in the downlink of a cellular network. This relationship has been well known for sparse deployment, i.e. when the number of BSs is small compared to the number of users. In this case the SE is independent of BS density. As BS density grows, on the other hand, it has previously been shown that increasing the BS density increases the SE, but no tractable form for the SE-BS density relationship has yet been derived. In this paper we derive such a closed-form result that reveals the SE is asymptotically a logarithmic function of BS density as the density grows. Further, we study the impact of this result on the network operator's profit when user demand varies, and derive the profit maximizing BS density and the optimal amount of spectrum to be utilized in closed forms. In addition, we provide deployment planning guidelines that will aid the operator in his decision if he should invest in densifying his network or in acquiring more spectrum.

Connected through hyperedge HE-1 (induced by source paper "self organized scheduling request for uplink 5g networks a d2d clustering approach"):
  with members:
    - "power control and channel allocation for d2d underlaid cellular networks"
    - "ultra reliable and low latency wireless communication tail risk and scale"
    - "sinr and throughput of dense cellular networks with stretched exponential path loss"
    - "modeling and analysis of cellular networks using stochastic geometry a tutorial"
    - "the meta distribution of the sir for cellular networks with power control"
    - "stochastic geometry modeling and analysis of single and multi cluster wireless networks"
    - "spatiotemporal stochastic modeling of iot enabled cellular networks scalability and stability analysis"
    - "analytical modeling of interference aware power control for the uplink of heterogeneous cellular networks"

Connected through hyperedge HE-2 (induced by source paper "millimeter wave interference avoidance via building aware associations"):
  with members:
    - "modeling and analyzing millimeter wave cellular systems"
    - "coverage analysis for millimeter wave networks the impact of directional antenna arrays"
    - "user attraction via wireless charging in downlink cellular networks"
    - "downlink and uplink cell association with traditional macrocells and millimeter wave small cells"
    - "design and analysis of initial access in millimeter wave cellular networks"
    - "initial access in 5g mmwave cellular networks"
    - "tractable resource management with uplink decoupled millimeter wave overlay in ultra dense cellular networks"
    - "on the feasibility of sharing spectrum licenses in mmwave cellular systems"

Connected through hyperedge HE-3 (induced by source paper "cooperative transmissions in ultra dense networks under a bounded dual slope path loss model"):
  with members:
    - "tractable resource management with uplink decoupled millimeter wave overlay in ultra dense cellular networks"
    - "towards 1 gbps ue in cellular systems understanding ultra dense small cell deployments"
    - "downlink cellular network analysis with multi slope path loss models"
    - "will the area spectral efficiency monotonically grow as small cells go dense"
    - "how user throughput depends on the traffic demand in large cellular networks"
    - "downlink capacity and base station density in cellular networks"

Connected through hyperedge HE-4 (induced by source paper "joint transmission with dummy symbols for dynamic tdd in ultra dense deployments"):
  with members:
    - "interference management in 5g reverse tdd hetnets with wireless backhaul a large system analysis"
    - "technical rate of substitution of spectrum in future mobile broadband provisioning"

Connected through hyperedge HE-5 (induced by source paper "tractable resource management with uplink decoupled millimeter wave overlay in ultra dense cellular networks"):
  with members:
    - "low power analog to digital conversion in millimeter wave systems impact of resolution and bandwidth on performance"
    - "why to decouple the uplink and downlink in cellular networks and how to do it"
    - "resource management and cell planning in millimeter wave overlaid ultra dense cellular networks"
    - "towards 1 gbps ue in cellular systems understanding ultra dense small cell deployments"
    - "effect of los nlos propagation on ultra dense networks"
    - "tractable resource management in millimeter wave overlaid ultra dense cellular networks"
    - "are we approaching the fundamental limits of wireless network densification"
    - "downlink cellular network analysis with multi slope path loss models"

Connected through hyperedge HE-6 (induced by source paper "energy efficiency of downlink networks with caching at base stations"):
  with members:
    - "content caching and delivery over heterogeneous wireless networks"
    - "multicast aware caching for small cell networks"
    - "living on the edge the role of proactive caching in 5g wireless networks"
    - "on the complexity of optimal routing and content caching in heterogeneous networks"
    - "throughput and energy efficiency analysis of small cell networks with multi antenna base stations"
    - "downlink multi antenna heterogeneous cellular network with load balancing"
    - "fundamental limits of caching"
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"

Connected through hyperedge HE-7 (induced by source paper "user attraction via wireless charging in downlink cellular networks"):
  with members:
    - "cutting last wires for mobile communication by microwave power transfer"
    - "offloading in heterogeneous networks modeling analysis and design insights"
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"
    - "enabling wireless power transfer in cellular networks architecture modeling and deployment"

Connected through hyperedge HE-8 (induced by source paper "traffic convexity aware cellular networks a vehicular heavy user perspective"):
  with members:
    - "handoff rate and coverage analysis in multi tier heterogeneous networks"
    - "offloading in heterogeneous networks modeling analysis and design insights"

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)