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: "spectrum leasing as an incentive towards uplink macrocell and femtocell cooperation"
  Abstract: The concept of femtocell access points underlaying existing communication infrastructure has recently emerged as a key technology that can significantly improve the coverage and performance of next-generation wireless networks. In this paper, we propose a framework for macrocell-femtocell cooperation under a closed access policy, in which a femtocell user may act as a relay for macrocell users. In return, each cooperative macrocell user grants the femtocell user a fraction of its superframe. We formulate a coalitional game with macrocell and femtocell users being the players, which can take individual and distributed decisions on whether to cooperate or not, while maximizing a utility function that captures the cooperative gains, in terms of throughput and delay. We show that the network can self-organize into a partition composed of disjoint coalitions which constitutes the recursive core of the game which is a key solution concept for coalition formation games in partition form. Simulation results show that the proposed coalition formation algorithm yields significant gains in terms of average rate per macrocell user, reaching up to 239%, relative to the non-cooperative case. Moreover, the proposed approach shows an improvement in terms of femtocell users' rate of up to 21% when compared to the traditional closed access policy.

Connected through hyperedge HE-1 (induced by source paper "matching based two timescale resource allocation for cooperative d2d communication"):
  with members:
    - "learning for matching game in cooperative d2d communication with incomplete information"
    - "cooperative spectrum sharing between d2d users and edge users a matching theory perspective"
    - "a survey on device to device communication in cellular networks"
    - "relay selection and power allocation in cooperative cellular networks"

Connected through hyperedge HE-2 (induced by source paper "outage analysis of offloading in heterogeneous networks composite fading channels"):
  with members:
    - "towards 1 gbps ue in cellular systems understanding ultra dense small cell deployments"
    - "analysis and optimization of inter tier interference coordination in downlink multi antenna hetnets with offloading"
    - "joint resource partitioning and offloading in heterogeneous cellular networks"
    - "offloading in heterogeneous networks modeling analysis and design insights"
    - "modeling heterogeneous network interference using poisson point processes"
    - "non cooperative game for capacity offload"
    - "price based resource allocation for spectrum sharing femtocell networks a stackelberg game approach"
    - "a tractable approach to coverage and rate in cellular networks"

Connected through hyperedge HE-3 (induced by source paper "shared spectrum access communications a neutral host micro operator approach"):
  with members:
    - "ultra dense small cell networks turning density into energy efficiency"
    - "from network sharing to multi tenancy the 5g network slice broker"
    - "resource allocation in shared spectrum access communications for operators with diverse service requirements"
    - "filtered ofdm enabler for flexible waveform in the 5th generation cellular networks"
    - "towards 1 gbps ue in cellular systems understanding ultra dense small cell deployments"
    - "what will 5g be"

Connected through hyperedge HE-4 (induced by source paper "network wide distributed carrier frequency offsets estimation and compensation"):
  with members:
    - "interference mitigation through limited receiver cooperation"

Connected through hyperedge HE-5 (induced by source paper "spectrum and energy efficiency evaluation of two tier femtocell networks with partially open channels"):
  with members:
    - "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"
    - "interference mitigation using uplink power control for two tier femtocell networks"
    - "femtocell networks a survey"
    - "uplink capacity and interference avoidance for two tier femtocell networks"

Connected through hyperedge HE-6 (induced by source paper "broadcast channel games equilibrium characterization and a mimo mac bc game duality"):
  with members:
    - "power allocation games in wireless networks of multi antenna terminals"
    - "a simple characterization of strategic behaviors in broadcast channels"
    - "weighted sum rate optimization for cognitive radio mimo broadcast channels"
    - "distributed power allocation with rate constraints in gaussian parallel interference channels"

Connected through hyperedge HE-7 (induced by source paper "competition vs cooperation a game theoretic decision analysis for mimo hetnets"):
  with members:
    - "price based resource allocation for spectrum sharing femtocell networks a stackelberg game approach"
    - "adaptive spatial intercell interference cancellation in multicell wireless networks"
    - "coalitions in cooperative 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.GT(Computer Science and Game Theory)