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: "cache enabled heterogeneous cellular networks comparison and tradeoffs"
  Abstract: Caching popular contents at base stations (BSs) is a promising way to unleash the potential of cellular heterogeneous networks (HetNets), where backhaul has become a bottleneck. In this paper, we compare a cache-enabled HetNet where a tier of multi-antenna macro BSs is overlaid by a tier of helper nodes having caches but no backhaul with a conventional HetNet where the macro BSs tier is overlaid by a tier of pico BSs with limited-capacity backhaul. We resort stochastic geometry theory to derive the area spectral efficiencies (ASEs) of these two kinds of HetNets and obtain the closed-form expressions under a special case. We use numerical results to show that the helper density is only 1/4 of the pico BS density to achieve the same target ASE, and the helper density can be further reduced by increasing cache capacity. With given total cache capacity within an area, there exists an optimal helper node density that maximizes the ASE.

Connected through hyperedge HE-1 (induced by source paper "enhancing performance of random caching in large scale heterogeneous wireless networks with random discontinuous transmission"):
  with members:
    - "enhancing performance of random caching in large scale wireless networks with multiple receive antennas"
    - "random caching based cooperative transmission in heterogeneous wireless networks"
    - "spatio temporal interference correlation and joint coverage in cellular networks"
    - "caching at the wireless edge design aspects challenges and future directions"
    - "optimal content placement for offloading in cache enabled heterogeneous wireless networks"
    - "effect of retransmissions on optimal caching in cache enabled small cell networks"
    - "wireless caching technical misconceptions and business barriers"
    - "a learning based approach to caching in heterogenous small cell networks"

Connected through hyperedge HE-2 (induced by source paper "a survey on mobile edge networks convergence of computing caching and communications"):
  with members:
    - "mobile edge computing fog et al a survey and analysis of security threats and challenges"
    - "pricing and resource allocation via game theory for a small cell video caching system"
    - "delay optimal computation task scheduling for mobile edge computing systems"
    - "caching at the wireless edge design aspects challenges and future directions"
    - "dynamic computation offloading for mobile edge computing with energy harvesting devices"
    - "energy efficient resource allocation for mobile edge computation offloading extended version"
    - "wireless caching technical misconceptions and business barriers"
    - "cooperative device to device communications with caching"

Connected through hyperedge HE-3 (induced by source paper "random caching based cooperative transmission in heterogeneous wireless networks"):
  with members:
    - "optimal content placement for offloading in cache enabled heterogeneous wireless networks"
    - "a learning based approach to caching in heterogenous small cell networks"
    - "edge caching for coverage and capacity aided heterogeneous networks"
    - "caching in wireless small cell networks a storage bandwidth tradeoff"
    - "optimization and analysis of probabilistic caching in n tier heterogeneous networks"
    - "analysis and optimization of caching and multicasting in large scale cache enabled heterogeneous wireless networks"
    - "caching placement in stochastic wireless caching helper networks channel selection diversity via caching"
    - "cooperative caching and transmission design in cluster centric small cell networks"

Connected through hyperedge HE-4 (induced by source paper "caching policy toward maximal success probability and area spectral efficiency of cache enabled hetnets"):
  with members:
    - "caching at the wireless edge design aspects challenges and future directions"
    - "optimal content placement for offloading in cache enabled heterogeneous wireless networks"
    - "edge caching for coverage and capacity aided heterogeneous networks"
    - "energy efficiency of downlink networks with caching at base stations"
    - "optimal caching placement for d2d assisted wireless caching networks"
    - "analysis on cache enabled wireless heterogeneous networks"
    - "optimal geographic caching in cellular networks"
    - "analysis and optimization of caching and multicasting in large scale cache enabled wireless networks"

Connected through hyperedge HE-5 (induced by source paper "joint and competitive caching designs in large scale multi tier wireless multicasting networks"):
  with members:
    - "ultra dense edge caching under spatio temporal demand and network dynamics"
    - "random caching based cooperative transmission in heterogeneous wireless networks"
    - "on optimal geographical caching in heterogeneous cellular networks"
    - "caching in wireless small cell networks a storage bandwidth tradeoff"
    - "optimal caching and user association in cache enabled heterogeneous wireless networks"
    - "a stackelberg game for incentive proactive caching mechanisms in wireless networks"
    - "optimization and analysis of probabilistic caching in n tier heterogeneous networks"
    - "analysis and optimization of caching and multicasting in large scale cache enabled heterogeneous wireless networks"

Connected through hyperedge HE-6 (induced by source paper "cache enabled device to device communications offloading gain and energy cost"):
  with members:
    - "optimal caching and scheduling for cache enabled d2d communications"
    - "wireless device to device caching networks basic principles and system performance"
    - "energy efficiency of downlink networks with caching at base stations"
    - "energy costs for traffic offloading by cache enabled d2d communications"
    - "a survey on device to device communication in cellular networks"
    - "living on the edge the role of proactive caching in 5g wireless networks"
    - "base station assisted device to device communications for high throughput wireless video networks"
    - "exploring social ties for enhanced device to device communications in wireless networks"

Connected through hyperedge HE-7 (induced by source paper "analysis and optimization of caching and multicasting in large scale cache enabled heterogeneous wireless networks"):
  with members:
    - "stochastic content centric multicast scheduling for cache enabled heterogeneous cellular networks"
    - "caching in wireless small cell networks a storage bandwidth tradeoff"
    - "optimal caching and user association in cache enabled heterogeneous wireless networks"
    - "cooperative caching and transmission design in cluster centric small cell networks"
    - "caching with unknown popularity profiles in small cell networks"
    - "analysis on cache enabled wireless heterogeneous networks"
    - "optimizing mds codes for caching at the edge"
    - "optimal geographic caching in cellular networks"

Connected through hyperedge HE-8 (induced by source paper "optimal caching and user association in cache enabled heterogeneous wireless networks"):
  with members:
    - "analysis on cache enabled wireless heterogeneous networks"
    - "capacity and stable scheduling in heterogeneous wireless 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)