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: "coordination protocol for inter operator spectrum sharing in co primary 5g small cell networks"
  Abstract: We consider spectrum sharing between a limited set of operators having similar rights for accessing spectrum. A coordination protocol acting on the level of the RAN is designed. The protocol is non-cooperative, but assumes an agreement to a set of negotiation rules. The signaling overhead is low, and knowledge of a competitor’s channel state information is not assumed. No monetary transactions are involved; instead, spectrum sharing is based on a RAN-internal virtual currency. The protocol is applicable both in a scenario of mutual renting and when the operators form a spectrum pool. The protocol reacts to variations in interference and load of operators, and shows gains in a simulated small cell scenario.

Connected through hyperedge HE-1 (induced by source paper "distributed resource allocation for network slicing over licensed and unlicensed bands"):
  with members:
    - "network slicing games enabling customization in multi tenant networks"
    - "sharing of unlicensed spectrum by strategic operators"
    - "joint energy and spectrum cooperation for cellular communication systems"
    - "investment and pricing with spectrum uncertainty a cognitive operator s perspective"
    - "cooperative games with overlapping coalitions"

Connected through hyperedge HE-2 (induced by source paper "network resource sharing games with instantaneous reciprocity"):
  with members:
    - "asymptotically optimal distributed channel allocation a competitive game theoretic approach"
    - "a comprehensive survey of potential game approaches to wireless networks"
    - "coalitional game theory for communication networks a tutorial"

Connected through hyperedge HE-3 (induced by source paper "sharing of unlicensed spectrum by strategic operators"):
  with members:
    - "licensed and unlicensed spectrum allocation in heterogeneous networks"
    - "allocation of licensed and unlicensed spectrum in heterogeneous networks"
    - "non cooperative game for capacity offload"

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)