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: "characterization of rate region in interference channels with constrained power"
  Abstract: In this paper, an n-user Gaussian interference channel under arbitrary linear power constraints is considered. Using Perron-Frobenius theorem, a closed-form expression for the boundary points of the rate region of such a channel is derived. This is a generalization of the well-known result on the maximum rate that some interfering links can simultaneously achieve when the power is unbounded. Moreover, this result is extended to the time-varying channels with constraints on the average power.

Connected through hyperedge HE-1 (induced by source paper "a geometrical description of the sinr region of the gaussian interference channel the two and three user case"):
  with members:
    - "capacity bounds for the gaussian interference channel"

Connected through hyperedge HE-2 (induced by source paper "optimal order of decoding for max min fairness in k user memoryless interference channels"):
  with members:
    - "fairness in multiuser systems with polymatroid capacity region"

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)