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: "distributed time frequency division multiple access protocol for wireless sensor networks"
  Abstract: It is well known that biology-inspired self-maintaining algorithms in wireless sensor nodes achieve near optimum time division multiple access (TDMA) characteristics in a decentralized manner and with very low complexity. We extend such distributed TDMA approaches to multiple channels (frequencies). This is achieved by extending the concept of collaborative reactive listening in order to balance the number of nodes in all available channels. We prove the stability of the new protocol and estimate the delay until the balanced system state is reached. Our approach is benchmarked against single-channel distributed TDMA and channel hopping approaches using TinyOS imote2 wireless sensors.

Connected through hyperedge HE-1 (induced by source paper "query processing for the internet of things coupling of device energy consumption and cloud infrastructure billing"):
  with members:
    - "cloud based augmentation for mobile devices motivation taxonomies and open challenges"
    - "energy consumption of visual sensor networks impact of spatio temporal coverage"
    - "throughput distortion computation of generic matrix multiplication toward a computation channel for digital signal processing systems"
    - "internet of things iot a vision architectural elements and future directions"
    - "optimum transmission policies for battery limited energy harvesting nodes"
    - "optimal packet scheduling in an energy harvesting communication system"

Connected through hyperedge HE-2 (induced by source paper "2d time frequency interference modelling using stochastic geometry for performance evaluation in low power wide area networks"):
  with members:
    - "understanding the limits of lorawan"
    - "long range communications in unlicensed bands the rising stars in the iot and smart city scenarios"

Connected through hyperedge HE-3 (induced by source paper "convergence of desynchronization primitives in wireless sensor networks a stochastic modeling approach"):
  with members:
    - "discrete dithered desynchronization"
    - "deploying wireless networks with beeps"

Connected through hyperedge HE-4 (induced by source paper "fast desynchronization for decentralized multichannel medium access control"):
  with members:
    - "convergence of desynchronization primitives in wireless sensor networks a stochastic modeling approach"

Connected through hyperedge HE-5 (induced by source paper "energy consumption of visual sensor networks impact of spatio temporal coverage"):
  with members:
    - "internet of things iot a vision architectural elements and future directions"
    - "faster and better a machine learning approach to corner detection"

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)