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: "physical layer security in three tier wireless sensor networks a stochastic geometry approach"
  Abstract: This paper develops a tractable framework for exploiting the potential benefits of physical layer security in three-tier wireless sensor networks using stochastic geometry. In such networks, the sensing data from the remote sensors are collected by sinks with the help of access points, and the external eavesdroppers intercept the data transmissions.We focus on the secure transmission in two scenarios: i) the active sensors transmit their sensing data to the access points, and ii) the active access points forward the data to the sinks. We derive new compact expressions for the average secrecy rate in these two scenarios. We also derive a new compact expression for the overall average secrecy rate. Numerical results corroborate our analysis and show that multiple antennas at the access points can enhance the security of three-tier wireless sensor networks. Our results show that increasing the number of access points decreases the average secrecy rate between the access point and its associated sink. However, we find that increasing the number of access points first increases the overall average secrecy rate, with a critical value beyond which the overall average secrecy rate then decreases. When increasing the number of active sensors, both the average secrecy rate between the sensor and its associated access point and the overall average secrecy rate decrease. In contrast, increasing the number of sinks improves both the average secrecy rate between the access point and its associated sink, as well as the overall average secrecy rate.

Connected through hyperedge HE-1 (induced by source paper "secure and energy efficient transmissions in cache enabled heterogeneous cellular networks performance analysis and optimization"):
  with members:
    - "generalization of lru cache replacement policy with applications to video streaming"
    - "cache enabled physical layer security for video streaming in backhaul limited cellular networks"
    - "safeguarding decentralized wireless networks using full duplex jamming receivers"
    - "secure video streaming in heterogeneous small cell networks with untrusted cache helpers"
    - "sprout a functional caching approach to minimize service latency in erasure coded storage"
    - "wireless caching technical misconceptions and business barriers"
    - "on edge caching with secrecy constraints"
    - "a survey on wireless security technical challenges recent advances and future trends"

Connected through hyperedge HE-2 (induced by source paper "stochastic geometry modeling of cellular v2x communication over shared channels"):
  with members:
    - "success probability and area spectral efficiency of a vanet modeled as a cox process"
    - "an analytical framework for coverage in cellular networks leveraging vehicles"
    - "coverage analysis of a vehicular network modeled as cox process driven by poisson line process"
    - "asymptotic blind spot analysis of localization networks under correlated blocking using a poisson line process"
    - "a primer on cellular network analysis using stochastic geometry"
    - "artificial noise aided secure transmission in large scale spectrum sharing networks"
    - "d2d based v2v communications with latency and reliability constraints"
    - "on stochastic geometry modeling of cellular uplink transmission with truncated channel inversion power control"

Connected through hyperedge HE-3 (induced by source paper "physical layer security in heterogeneous networks with jammer selection and full duplex users"):
  with members:
    - "exploiting full duplex receivers for achieving secret communications in multiuser miso networks"
    - "power allocation for secure swipt systems with wireless powered cooperative jamming"
    - "hybrid duplex switching in heterogeneous networks"
    - "opportunistic jamming for enhancing security stochastic geometry modeling and analysis"
    - "physical layer security in millimeter wave cellular networks"
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "physical layer security in heterogeneous cellular networks"
    - "secure communication in uplink transmissions user selection and multiuser secrecy gain"

Connected through hyperedge HE-4 (induced by source paper "boundaries as an enhancement technique for physical layer security"):
  with members:
    - "temporal correlation of interference and outage in mobile networks over one dimensional finite regions"
    - "stochastic geometry based comparison of secrecy enhancement techniques in d2d networks"
    - "temporal correlation of interference in bounded mobile ad hoc networks with blockage"
    - "distribution of cell size in bounded voronoi tesselations with application to secure local connectivity"
    - "device to device millimeter wave communications interference coverage rate and finite topologies"
    - "physical layer security in heterogeneous cellular networks"
    - "analyzing the impact of access point density on the performance of finite area networks"
    - "more is less connectivity in fractal regions"

Connected through hyperedge HE-5 (induced by source paper "boundaries can enhance physical layer security at high data rates"):
  with members:
    - "temporal correlation of interference and outage in mobile networks over one dimensional finite regions"
    - "physical layer security in wireless ad hoc networks under a hybrid full half duplex receiver deployment strategy"
    - "stochastic geometry based comparison of secrecy enhancement techniques in d2d networks"
    - "temporal correlation of interference in bounded mobile ad hoc networks with blockage"
    - "physical layer security in heterogeneous cellular networks"
    - "improving physical layer security in wireless communications using diversity techniques"
    - "analyzing the impact of access point density on the performance of finite area networks"
    - "more is less connectivity in fractal regions"

Connected through hyperedge HE-6 (induced by source paper "analyzing large scale multiuser molecular communication via 3d stochastic geometry"):
  with members:
    - "reactive receiver modeling for diffusive molecular communication systems with molecule degradation"
    - "3d stochastic geometry model for large scale molecular communication systems"
    - "modeling and simulation of molecular communication systems with a reversible adsorption receiver"
    - "improving receiver performance of diffusive molecular communication with enzymes"
    - "a unifying model for external noise sources and isi in diffusive molecular communication"
    - "isi mitigation techniques in molecular communication"
    - "effect of degradation in molecular communication impairment or enhancement"
    - "using dimensional analysis to assess scalability and accuracy in molecular communication"

Connected through hyperedge HE-7 (induced by source paper "random access analysis for massive iot networks under a new spatio temporal model a stochastic geometry approach"):
  with members:
    - "stochastic coalitional games for cooperative random access in m2m communications"
    - "spatiotemporal stochastic modeling of iot enabled cellular networks scalability and stability analysis"
    - "artificial noise aided secure transmission in large scale spectrum sharing networks"
    - "heterogeneous cellular networks with spatio temporal traffic delay analysis and scheduling"
    - "on stochastic geometry modeling of cellular uplink transmission with truncated channel inversion power control"
    - "analytical modeling of uplink cellular networks"
    - "internet of things iot a vision architectural elements and future directions"
    - "downlink capacity and base station density in cellular networks"

Connected through hyperedge HE-8 (induced by source paper "artificial interference aided physical layer security in cache enabled heterogeneous networks"):
  with members:
    - "the three primary colors of mobile systems"
    - "cache enabled physical layer security for video streaming in wireless networks with limited backhaul"
    - "analysis on cache enabled wireless heterogeneous networks"
    - "fundamental limits of caching with secure delivery"
    - "enhancing secrecy with multi antenna transmission in wireless ad hoc networks"
    - "physical layer security in cellular networks a stochastic geometry approach"
    - "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.IT(Information Theory)