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: "next generation m2m cellular networks challenges and practical considerations"
  Abstract: In this article, we present the major challenges of future machine-to-machine (M2M) cellular networks such as spectrum scarcity problem, support for low-power, low-cost, and numerous number of devices. As being an integral part of the future Internet-of-Things (IoT), the true vision of M2M communications cannot be reached with conventional solutions that are typically cost inefficient. Cognitive radio concept has emerged to significantly tackle the spectrum under-utilization or scarcity problem. Heterogeneous network model is another alternative to relax the number of covered users. To this extent, we present a complete fundamental understanding and engineering knowledge of cognitive radios, heterogeneous network model, and power and cost challenges in the context of future M2M cellular networks.

Connected through hyperedge HE-1 (induced by source paper "a throughput and energy efficiency scheme for unlicensed massive machine type communications"):
  with members:
    - "finite blocklength communications in smart grids for dynamic spectrum access and locally licensed scenarios"
    - "5g wireless network slicing for embb urllc and mmtc a communication theoretic view"
    - "energy efficiency of an unlicensed wireless network in the presence of retransmissions"
    - "increasing the throughput of an unlicensed wireless network through retransmissions"
    - "massive machine type communications in 5g physical and mac layer solutions"
    - "a survey on internet of things from industrial market perspective"
    - "on the joint impact of beamwidth and orientation error on throughput in directional wireless poisson networks"
    - "green cellular networks a survey some research issues and challenges"

Connected through hyperedge HE-2 (induced by source paper "energy efficient massive iot shared spectrum access over uav enabled cellular networks"):
  with members:
    - "cellular connected uav uplink association power control and interference coordination"
    - "performance analysis of uplink cellular iot using different deployments of data aggregators"
    - "aeronautical data aggregation and field estimation in iot networks hovering traveling time dilemma of uavs"
    - "mobile unmanned aerial vehicles uavs for energy efficient internet of things communications"
    - "on the energy distortion tradeoff in the iot"
    - "energy efficient data collection in uav enabled wireless sensor network"
    - "energy efficient uav communication with trajectory optimization"
    - "energy efficient power control a look at 5g wireless technologies"

Connected through hyperedge HE-3 (induced by source paper "finite blocklength communications in smart grids for dynamic spectrum access and locally licensed scenarios"):
  with members:
    - "ultra reliable cooperative short packet communications with wireless energy transfer"
    - "5g mobile cellular networks enabling distributed state estimation for smart grids"
    - "ultra reliable communication via optimum power allocation for type i arq in finite block length"
    - "convolutive superposition for multicarrier cognitive radio systems"
    - "maximizing the link throughput between smart meters and aggregators as secondary users under power and outage constraints"
    - "massive machine type communications in 5g physical and mac layer solutions"
    - "contention based geographic forwarding strategies for wireless sensors networks"
    - "a survey on internet of things from industrial market perspective"

Connected through hyperedge HE-4 (induced by source paper "statistical qos provisioning for mtc networks under finite blocklength"):
  with members:
    - "on the effective capacity of mtc networks in the finite blocklength regime"
    - "ultra reliable communication via optimum power allocation for type i arq in finite block length"
    - "low latency ultra reliable 5g communications finite blocklength bounds and coding schemes"
    - "blocklength limited performance of relaying under quasi static rayleigh channels"
    - "ultra reliable communication in 5g wireless systems"
    - "throughput analysis of buffer constrained wireless systems in the finite blocklength regime"

Connected through hyperedge HE-5 (induced by source paper "enhanced uplink resource allocation in non orthogonal multiple access systems"):
  with members:
    - "many to many matching games for proactive social caching in wireless small cell networks"

Connected through hyperedge HE-6 (induced by source paper "on the limits of coexisting coverage and capacity in multi rat heterogeneous networks"):
  with members:
    - "fundamentals of the downlink green coverage and energy efficiency in heterogeneous networks"
    - "coexisting success probability and throughput of multi rat wireless networks with unlicensed band access"
    - "random cell association and void probability in poisson distributed cellular networks"
    - "optimal cell load and throughput in green small cell networks with generalized cell association"
    - "coexistence of wi fi and heterogeneous small cell networks sharing unlicensed spectrum"
    - "adaptive downlink comp in heterogeneous cellular networks with imperfect overhead messaging"
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"
    - "modeling and analysis of k tier downlink heterogeneous cellular networks"

Connected through hyperedge HE-7 (induced by source paper "machine to machine m2m communications in software defined and virtualized cellular networks"):
  with members:
    - "distributed virtual resource allocation in small cell networks with full duplex self backhauls and virtualization"
    - "reliable reporting for massive m2m communications with periodic resource pooling"
    - "fundamentals of throughput maximization with random arrivals for m2m communications"

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)