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: "on the delay of geographical caching methods in two tiered heterogeneous networks"
  Abstract: We consider a hierarchical network that consists of mobile users, a two-tiered cellular network (namely small cells and macro cells) and central routers, each of which follows a Poisson point process (PPP). In this scenario, small cells with limited-capacity backhaul are able to cache content under a given set of randomized caching policies and storage constraints. Moreover, we consider three different content popularity models, namely fixed content popularity, distance-dependent and load-dependent, in order to model the spatio-temporal behavior of users' content request patterns. We derive expressions for the average delay of users assuming perfect knowledge of content popularity distributions and randomized caching policies. Although the trend of the average delay for all three content popularity models is essentially identical, our results show that the overall performance of cached-enabled heterogeneous networks can be substantially improved, especially under the load-dependent content popularity model.

Connected through hyperedge HE-1 (induced by source paper "wireless caching helper system with heterogeneous traffic and random availability"):
  with members:
    - "modeling and performance analysis of full duplex communications in cache enabled d2d networks"
    - "a survey on mobile edge networks convergence of computing caching and communications"
    - "optimal caching and scheduling for cache enabled d2d communications"
    - "cache enabled device to device communications offloading gain and energy cost"
    - "spatially correlated content caching for device to device communications"
    - "wireless caching technical misconceptions and business barriers"
    - "content caching and distribution in smart grid enabled wireless networks"
    - "energy efficiency of downlink networks with caching at base stations"

Connected through hyperedge HE-2 (induced by source paper "cost effective cache deployment in mobile heterogeneous networks"):
  with members:
    - "on optimal geographical caching in heterogeneous cellular networks"
    - "cache size allocation in backhaul limited wireless networks"
    - "a learning based approach to caching in heterogenous small cell networks"
    - "optimal caching and user association in cache enabled heterogeneous wireless networks"
    - "mobility aware caching for content centric wireless networks modeling and methodology"
    - "wireless content caching for small cell and d2d networks"
    - "energy efficiency of downlink networks with caching at base stations"
    - "content centric sparse multicast beamforming for cache enabled cloud ran"

Connected through hyperedge HE-3 (induced by source paper "cooperative edge caching in user centric clustered mobile networks"):
  with members:
    - "cost effective cache deployment in mobile heterogeneous networks"
    - "policy optimization for content push via energy harvesting small cells in heterogeneous networks"
    - "on optimal geographical caching in heterogeneous cellular networks"
    - "octopus a cooperative hierarchical caching strategy for cloud radio access networks"
    - "mobility aware caching for content centric wireless networks modeling and methodology"
    - "caching placement in stochastic wireless caching helper networks channel selection diversity via caching"
    - "cooperative caching and transmission design in cluster centric small cell networks"
    - "joint caching routing and channel assignment for collaborative small cell cellular networks"

Connected through hyperedge HE-4 (induced by source paper "optimal geographic caching in cellular networks with linear content coding"):
  with members:
    - "optimization of caching devices with geometric constraints"
    - "a provably efficient online collaborative caching algorithm for multicell coordinated systems"
    - "optimal geographic caching in cellular networks"
    - "femtocaching and device to device collaboration a new architecture for wireless video distribution"

Connected through hyperedge HE-5 (induced by source paper "gibbsian on line distributed content caching strategy for cellular networks"):
  with members:
    - "caching policy toward maximal success probability and area spectral efficiency of cache enabled hetnets"
    - "a low complexity approach to distributed cooperative caching with geographic constraints"
    - "on optimal geographical caching in heterogeneous cellular networks"
    - "a learning based approach to caching in heterogenous small cell networks"
    - "edge caching for coverage and capacity aided heterogeneous networks"
    - "placing dynamic content in caches with small population"
    - "optimization of caching devices with geometric constraints"
    - "optimal geographic caching 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)