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 performance of the relay arq networks"
  Abstract: This paper investigates the performance of relay networks in the presence of hybrid automatic repeat request (ARQ) feedback and adaptive power allocation. The throughput and the outage probability of different hybrid ARQ protocols are studied for independent and spatially correlated fading channels. The results are obtained for the cases where there is a sum power constraint on the source and the relay or when each of the source and the relay are power-limited individually. With adaptive power allocation, the results demonstrate the efficiency of relay–ARQ techniques under different conditions.

Connected through hyperedge HE-1 (induced by source paper "a semi linear approximation of the first order marcum q function with application to predictor antenna systems"):
  with members:
    - "integrated access backhauled networks"
    - "ultra reliable uav communication using altitude and cooperation diversity"
    - "solutions to integrals involving the marcum q function and applications"
    - "analytic expressions and bounds for special functions and applications in communication theory"
    - "an approximation of the first order marcum q function with application to network connectivity analysis"

Connected through hyperedge HE-2 (induced by source paper "power allocation for type i arq two hop cooperative networks for ultra reliable communication"):
  with members:
    - "ultra reliable communication via optimum power allocation for type i arq in finite block length"

Connected through hyperedge HE-3 (induced by source paper "on the performance of rf fso links with and without hybrid arq"):
  with members:
    - "on noisy arq in block fading channels"
    - "finite block length analysis of the incremental redundancy harq"
    - "on the benefits of partial channel state information for repetition protocols in block fading channels"
    - "lecture notes on network information theory"
    - "on the capacity of free space optical intensity channels"
    - "hybrid arq in multiple antenna slow fading channels performance limits and optimal linear dispersion code design"
    - "performance of hybrid arq in block fading channels a fixed outage probability analysis"

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)