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: "interference mitigation using uplink power control for two tier femtocell networks"
  Abstract: This paper proposes two interference mitigation strategies that adjust the maximum transmit power of femtocell users to suppress the cross-tier interference at a macrocell base station (BS). The open-loop and the closed-loop control suppress the cross-tier interference less than a fixed threshold and an adaptive threshold based on the noise and interference (NI) level at the macrocell BS, respectively. Simulation results show that both schemes effectively compensate the uplink throughput degradation of the macrocell BS due to the cross-tier interference and that the closed-loop control provides better femtocell throughput than the open-loop control at a minimal cost of macrocell throughput.

Connected through hyperedge HE-1 (induced by source paper "efficient interference management policies for femtocell networks"):
  with members:
    - "energy efficient nonstationary spectrum sharing"
    - "on achieving local view capacity via maximal independent graph scheduling"
    - "power control in two tier femtocell networks"

Connected through hyperedge HE-2 (induced by source paper "spectrum and energy efficiency evaluation of two tier femtocell networks with partially open channels"):
  with members:
    - "spectrum leasing as an incentive towards uplink macrocell and femtocell cooperation"
    - "capacity analysis of a multi cell multi antenna cooperative cellular network with co channel interference"
    - "green cellular networks a survey some research issues and challenges"
    - "open vs closed access femtocells in the uplink"
    - "power control in two tier femtocell networks"
    - "femtocell networks a survey"
    - "uplink capacity and interference avoidance for two tier femtocell networks"

Connected through hyperedge HE-3 (induced by source paper "coalitional games with overlapping coalitions for interference management in small cell networks"):
  with members:
    - "a study of trade off between opportunistic resource allocation and interference alignment in femtocell scenarios"
    - "on the coexistence of macrocell spatial multiplexing and cognitive femtocells"
    - "price based resource allocation for spectrum sharing femtocell networks a stackelberg game approach"
    - "on providing downlink services in collocated spectrum sharing macro and femto networks"
    - "cooperative games with overlapping coalitions"
    - "power control in two tier femtocell networks"
    - "femtocell networks a survey"

Connected through hyperedge HE-4 (induced by source paper "distributed interference management policies for heterogeneous small cell networks"):
  with members:
    - "enhanced intercell interference coordination challenges in heterogeneous networks"
    - "power control in two tier femtocell networks"

Connected through hyperedge HE-5 (induced by source paper "outage analysis of uplink two tier networks"):
  with members:
    - "on stochastic geometry modeling of cellular uplink transmission with truncated channel inversion power control"
    - "uplink interference analysis for two tier cellular networks with diverse users under random spatial patterns"
    - "understanding the benefits of open access in femtocell networks stochastic geometric analysis in the uplink"
    - "analytical modeling of uplink cellular networks"
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"
    - "modeling and analysis of k tier downlink heterogeneous cellular networks"
    - "a tractable approach to coverage and rate in cellular networks"
    - "open vs closed access femtocells in the uplink"

Connected through hyperedge HE-6 (induced by source paper "on improving energy efficiency within green femtocell networks a hierarchical reinforcement learning approach"):
  with members:
    - "dynamics of boltzmann q learning in two player two action games"
    - "price based resource allocation for spectrum sharing femtocell networks a stackelberg game approach"
    - "power control in two tier femtocell networks"
    - "introducing hierarchy in energy games"
    - "femtocell networks a survey"

Connected through hyperedge HE-7 (induced by source paper "femtocell architectures with spectrum sharing for cellular radio networks"):
  with members:
    - "spectrum sharing scheme between cellular users and ad hoc device to device users"
    - "power control in two tier femtocell networks"
    - "bandwidth partitioning in decentralized wireless networks"
    - "femtocell networks a survey"

Connected through hyperedge HE-8 (induced by source paper "open closed and shared access femtocells in the downlink"):
  with members:
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"
    - "fundamentals of inter cell overhead signaling in heterogeneous cellular networks"
    - "modeling and analysis of k tier downlink heterogeneous cellular networks"
    - "open vs closed access femtocells in the uplink"
    - "self optimized coverage coordination in femtocell networks"
    - "power control in two tier femtocell networks"
    - "coverage in multi antenna two tier networks"
    - "femtocell networks a survey"

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)