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: "impact of propagation environment on energy efficient relay placement model and performance analysis"
  Abstract: The performance of a relay-based cellular network is greatly affected by the relay location within a cell. Existing results for optimal relay placement do not reflect how the radio propagation environment and choice of the coding scheme can impact system performance. In this paper, we analyze the impact on relaying performance of node distances, relay height and line-of-sight conditions for both uplink and downlink transmissions, using several relay coding schemes. Our first objective is to propose a geometrical model for energy-efficient relay placement that requires only a small number of characteristic distances. Our second objective is to estimate the maximum cell coverage of a relay-aided cell given power constraints, and conversely, the averaged energy consumption given a cell radius. We show that the practical full decode-forward scheme performs close to the energy-optimized partial decode-forward scheme when the relay is ideally located. However, away from this optimum relay location, performance rapidly degrades and more advanced coding scheme, such as partial decode-forward, is needed to maintain good performance and allow more freedom in the relay placement. Finally, we define a trade-off between cell coverage and energy efficiency, and show that there exists a relay location for which increasing the cell coverage has a minimal impact on the average energy consumed per unit area.

Connected through hyperedge HE-1 (induced by source paper "optimal scheduling of reliability constrained relaying system under outdated csi in the finite blocklength regime"):
  with members:
    - "on the performance of ultra reliable decode and forward relaying under the finite blocklength"
    - "energy efficient packet scheduling with finite blocklength codes convexity analysis and efficient algorithms"
    - "blocklength limited performance of relaying under quasi static rayleigh channels"
    - "on the capacity of decode and forward relaying over rician fading channels"
    - "finite block length analysis of the incremental redundancy harq"
    - "throughput of cognitive radio systems with finite blocklength codes"
    - "the diversity multiplexing tradeoff of the dynamic decode and forward protocol on a mimo half duplex relay channel"
    - "coding versus arq in fading channels how reliable should the phy be"

Connected through hyperedge HE-2 (induced by source paper "the impact of outdated csi on the finite blocklength performance of relaying"):
  with members:
    - "blocklength limited performance of relaying under quasi static rayleigh channels"
    - "on the capacity of decode and forward relaying over rician fading channels"
    - "finite block length analysis of the incremental redundancy harq"
    - "the diversity multiplexing tradeoff of the dynamic decode and forward protocol on a mimo half duplex relay channel"
    - "coding versus arq in fading channels how reliable should the phy be"

Connected through hyperedge HE-3 (induced by source paper "blocklength limited performance of relaying under quasi static rayleigh channels"):
  with members:
    - "on the capacity of decode and forward relaying over rician fading channels"
    - "finite block length analysis of the incremental redundancy harq"
    - "quasi static multiple antenna fading channels at finite blocklength"
    - "the diversity multiplexing tradeoff of the dynamic decode and forward protocol on a mimo half duplex relay channel"
    - "coding versus arq in fading channels how reliable should the phy be"

Connected through hyperedge HE-4 (induced by source paper "modeling and analysis of energy efficiency and interference for cellular relay deployment"):
  with members:
    - "energy minimization for the half duplex relay channel with decode forward relaying"

Connected through hyperedge HE-5 (induced by source paper "analysis of coverage region for mimo relay network with multiple cooperative df relays"):
  with members:
    - "analysis of coverage region for mimo relay channel"
    - "transmit signal and bandwidth optimization in multiple antenna relay channels"
    - "on maximizing coverage in gaussian relay channels"

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.NI(Networking and Internet Architecture)