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: "time synchronization in vehicular ad hoc networks a survey on theory and practice"
  Abstract: Abstract   Time synchronization in communication networks provides a common time frame among all nodes, thus supporting various network functions such as message transmission, channel scheduling and resource sharing in real-time and in correct order. In vehicular ad-hoc networks (VANETs) for connected and automated vehicles, network nodes must be synchronized to exchange time-critical vehicle locations and warning messages for various road safety applications. However, this is challenging as the data communication systems need to achieve low latency and high reliability under the conditions of high user dynamics and density. While many synchronization techniques have been developed for general communications networks, it is necessary to understand the requirements for VANET time synchronization and the applicability of existing time synchronization techniques in VANET applications. This paper provides a survey on theory and practice of time synchronization in VANETs. It addresses some key factors in VANET time synchronization such as requirements analysis, precision, accuracy, availability, scalability and compatibility, and highlights the advantages of Global Navigation Satellite System (GNSS) in VANET time synchronization. Through this survey, some insights are developed into existing and emerging protocols for time synchronization in VANETs.

Connected through hyperedge HE-1 (induced by source paper "cognitive internet of vehicles motivation layered architecture and security issues"):
  with members:
    - "gnss time synchronization in vehicular ad hoc networks benefits and feasibility"

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)