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: "service quality improvement of mobile users in vehicular environment by mobile femtocell network deployment"
  Abstract: The femto-access-point (FAP), a low power small cellular base station provides better signal quality for the indoor users. The mobile users in the vehicular environment suffer for the low quality signal from the outside wireless networks. The deployment of femtocells in the vehicular environment can solve the low level signal-to-noise plus interference problem. In this paper, we propose new application of the femtocell technology. The femtocells are deployed in the vehicular environment. Short distance between the user and the FAP provides better signal quality. The inside FAPs are connected to the core network through the outside macrocellular networks or the satellite networks. One stronger transceiver is installed at outside the vehicle. This transceiver is connected to FAPs using wired connection and to macrocellular or the satellite access networks through wireless link. The capacity and the outage probability are analyzed. The simulation results show that the proposed mobile femtocell deployment significantly enhances the service quality of mobile users in the vehicular environment.

Connected through hyperedge HE-1 (induced by source paper "interference mitigation and capacity enhancement based on dynamic frequency reuse for femtocell networks"):
  with members:
    - "radio resource management based on reused frequency allocation for dynamic channel borrowing scheme in wireless networks"
    - "cost effective frequency planning for capacity enhancement of femtocellular networks"

Connected through hyperedge HE-2 (induced by source paper "group handover management in mobile femtocellular network deployment"):
  with members:
    - "femtocell networks a survey"

Connected through hyperedge HE-3 (induced by source paper "radio resource management based on reused frequency allocation for dynamic channel borrowing scheme in wireless networks"):
  with members:
    - "radio resource allocation for scalable video services over wireless cellular networks"
    - "call admission control based on adaptive bandwidth allocation for wireless networks"
    - "cost effective frequency planning for capacity enhancement of femtocellular networks"

Connected through hyperedge HE-4 (induced by source paper "energy efficient cellular communications powered by smart grid technology"):
  with members:
    - "group handover management in mobile femtocellular network deployment"

Connected through hyperedge HE-5 (induced by source paper "class based interference management in wireless networks"):
  with members:
    - "radio resource management for dynamic channel borrowing scheme in wireless networks"
    - "interference declination for dynamic channel borrowing scheme in wireless networks"
    - "call admission control based on adaptive bandwidth allocation for wireless networks"

Connected through hyperedge HE-6 (induced by source paper "intelligent interference management based on on demand service connectivity for femtocellular networks"):
  with members:
    - "cost effective frequency planning for capacity enhancement of femtocellular networks"
    - "network evolution and qos provisioning for integrated femtocell macrocell networks"
    - "femtocell networks a survey"

Connected through hyperedge HE-7 (induced by source paper "design of two port mimo antennas without space for isolation"):
  with members:
    - "cost effective frequency planning for capacity enhancement of femtocellular 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)