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: "a new analysis of the ds cdma cellular downlink under spatial constraints"
  Abstract: The direct-sequence code-division multiple access (DS-CDMA) cellular downlink is modeled by a constrained random spatial model involving a fixed number of base stations placed over a finite area with a minimum separation. The analysis is driven by a new closed-form expression for the conditional outage probability at each mobile, where the conditioning is with respect to the network realization. The analysis features a flexible channel model, accounting for path loss, Nakagami fading, and shadowing. By generating many random networks and applying a given resource allocation policy, the distribution of the rates provided to each user is obtained. In addition to determining the average rate, the analysis can determine the transmission capacity of the network and can characterize fairness in terms of the fraction of users that achieve a specified rate. The analysis is used to compare a rate-control policy against a power-control policy and investigate the influence of the minimum base-station separation.

Connected through hyperedge HE-1 (induced by source paper "an accurate and efficient analysis of a mbsfn network"):
  with members:
    - "an analysis of the ds cdma cellular uplink for arbitrary and constrained topologies"
    - "analysis of multi cell downlink cooperation with a constrained spatial model"
    - "the outage probability of a finite ad hoc network in nakagami fading"
    - "a tractable approach to coverage and rate in cellular networks"

Connected through hyperedge HE-2 (induced by source paper "analysis of multi cell downlink cooperation with a constrained spatial model"):
  with members:
    - "downlink coordinated multi point with overhead modeling in heterogeneous cellular networks"
    - "the outage probability of a finite ad hoc network in nakagami fading"
    - "a tractable approach to coverage and rate in cellular networks"
    - "an overview of the transmission capacity of wireless networks"

Connected through hyperedge HE-3 (induced by source paper "an analysis of the ds cdma cellular uplink for arbitrary and constrained topologies"):
  with members:
    - "the outage probability of a finite ad hoc network in nakagami fading"
    - "a tractable approach to coverage and rate in cellular networks"
    - "an overview of the transmission capacity of 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)