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: "multi tier network performance analysis using a shotgun cellular system"
  Abstract: Abstract--- This paper studies the carrier-to-interference ratio (CIR) and carrier-to-interference-plus-noise ratio (CINR) performance at the mobile station (MS) within a multi-tier network composed of M tiers of wireless networks, with each tier modeled as the homogeneous n-dimensional (n-D, n=1,2, and 3) shotgun cellular system, where the base station (BS) distribution is given by the homogeneous Poisson point process in n-D. The CIR and CINR at the MS in a single tier network are thoroughly analyzed to simplify the analysis of the multi-tier network. For the multi-tier network with given system parameters, the following are the main results of this paper: (1) semi-analytical expressions for the tail probabilities of CIR and CINR; (2) a closed form expression for the tail probability of CIR in the range [1,infinity); (3) a closed form expression for the tail probability of an approximation to CINR in the entire range [0,infinity); (4) a lookup table based approach for obtaining the tail probability of CINR, and (5) the study of the effect of shadow fading and BSs with ideal sectorized antennas on the CIR and CINR. Based on these results, it is shown that, in a practical cellular system, the installation of additional wireless networks (microcells, picocells and femtocells) with low power BSs over the already existing macrocell network will always improve the CINR performance at the MS.

Connected through hyperedge HE-1 (induced by source paper "modeling and performance of uplink cache enabled massive mimo heterogeneous networks"):
  with members:
    - "toward a realistic assessment of multiple antenna hcns residual additive transceiver hardware impairments and channel aging"
    - "impact of general channel aging conditions on the downlink performance of massive mimo"
    - "downlink mimo hcns with residual transceiver hardware impairments"
    - "cluster content caching an energy efficient approach to improve quality of service in cloud radio access networks"
    - "impact of user mobility on optimal linear receivers in cellular networks"
    - "deploying dense networks for maximal energy efficiency small cells meet massive mimo"
    - "an uplink interference analysis for massive mimo systems with mrc and zf receivers"
    - "massive mimo with non ideal arbitrary arrays hardware scaling laws and circuit aware design"

Connected through hyperedge HE-2 (induced by source paper "performance laws of large heterogeneous cellular networks"):
  with members:
    - "wireless networks appear poissonian due to strong shadowing"
    - "what frequency bandwidth to run cellular network in a given country a downlink dimensioning problem"
    - "how user throughput depends on the traffic demand in large cellular networks"
    - "equivalence and comparison of heterogeneous cellular networks"
    - "analysis of cell load coupling for lte network planning and optimization"
    - "modeling and analysis of k tier downlink heterogeneous cellular networks"
    - "a tractable approach to coverage and rate in cellular networks"

Connected through hyperedge HE-3 (induced by source paper "studying the sinr process of the typical user in poisson networks by using its factorial moment measures"):
  with members:
    - "a stochastic geometry framework for analyzing pairwise cooperative cellular networks"
    - "the performance of successive interference cancellation in random wireless networks"
    - "wireless networks appear poissonian due to strong shadowing"
    - "successive interference cancellation in heterogeneous cellular networks"
    - "sinr based k coverage probability in cellular networks with arbitrary shadowing"
    - "equivalence and comparison of heterogeneous cellular networks"
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"
    - "modeling and analysis of k tier downlink heterogeneous cellular networks"

Connected through hyperedge HE-4 (induced by source paper "statistical modeling and probabilistic analysis of cellular networks with determinantal point processes"):
  with members:
    - "studying the sinr process of the typical user in poisson networks by using its factorial moment measures"
    - "the ginibre point process as a model for wireless networks with repulsion"
    - "wireless networks appear poissonian due to strong shadowing"
    - "hetnets and massive mimo modeling potential gains and performance analysis"
    - "downlink mimo hetnets modeling ordering results and performance analysis"
    - "load aware modeling and analysis of heterogeneous cellular networks"
    - "modeling heterogeneous network interference using poisson point processes"
    - "modeling and analysis of k tier downlink heterogeneous cellular networks"

Connected through hyperedge HE-5 (induced by source paper "downlink analysis for a heterogeneous cellular network"):
  with members:
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"
    - "stochastic ordering based carrier to interference ratio analysis for the shotgun cellular systems"
    - "modeling and analysis of k tier downlink heterogeneous cellular networks"
    - "downlink coverage analysis in a heterogeneous cellular network"
    - "a tractable approach to coverage and rate in cellular networks"
    - "downlink performance analysis for a generalized shotgun cellular system"
    - "femtocell networks a survey"

Connected through hyperedge HE-6 (induced by source paper "average rate of downlink heterogeneous cellular networks over generalized fading channels a stochastic geometry approach"):
  with members:
    - "interference coordination random clustering and adaptive limited feedback"
    - "modeling analysis and design for carrier aggregation in heterogeneous cellular networks"
    - "quality of service in wireless cellular networks subject to log normal shadowing"
    - "offloading in heterogeneous networks modeling analysis and design insights"
    - "analytical modeling of uplink cellular networks"
    - "load aware modeling and analysis of heterogeneous cellular networks"
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"
    - "modeling heterogeneous network interference using poisson point processes"

Connected through hyperedge HE-7 (induced by source paper "downlink mimo hetnets modeling ordering results and performance analysis"):
  with members:
    - "downlink rate distribution in heterogeneous cellular networks under generalized cell selection"
    - "offloading in heterogeneous networks modeling analysis and design insights"
    - "modeling non uniform ue distributions in downlink cellular networks"
    - "analytical modeling of uplink cellular networks"
    - "load aware modeling and analysis of heterogeneous cellular networks"
    - "stochastic ordering of interferences in large scale wireless networks"
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"
    - "modeling heterogeneous network interference using poisson point processes"

Connected through hyperedge HE-8 (induced by source paper "fundamentals of heterogeneous cellular networks with energy harvesting"):
  with members:
    - "spatial throughput of mobile ad hoc networks powered by energy harvesting"
    - "throughput and energy efficiency analysis of small cell networks with multi antenna base stations"
    - "sinr based k coverage probability in cellular networks with arbitrary shadowing"
    - "downlink mimo hetnets modeling ordering results and performance analysis"
    - "downlink rate distribution in heterogeneous cellular networks under generalized cell selection"
    - "offloading in heterogeneous networks modeling analysis and design insights"
    - "modeling non uniform ue distributions in downlink cellular networks"
    - "analytical modeling of uplink 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)