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: "dronecells improving 5g spectral efficiency using drone mounted flying base stations"
  Abstract: We study a cellular networking scenario, called DroneCells, where miniaturized base stations (BSs) are mounted on flying drones to serve mobile users. We propose that the drones never stop, and move continuously within the cell in a way that reduces the distance between the BS and the serving users, thus potentially improving the spectral efficiency of the network. By considering the practical mobility constraints of commercial drones, we design drone mobility algorithms to improve the spectral efficiency of DroneCells. As the optimal problem is NP-hard, we propose a range of practically realizable heuristics with varying complexity and performance. Simulations show that, using the existing consumer drones, the proposed algorithms can readily improve spectral efficiency by 34\% and the 5-percentile packet throughput by 50\% compared to the scenario, where drones hover over fixed locations. More significant gains can be expected with more agile drones in the future. A surprising outcome is that the drones need to fly only at minimal speeds to achieve these gains, avoiding any negative effect on drone battery lifetime. We further demonstrate that the optimal solution provides only modest improvements over the best heuristic algorithm, which employs Game Theory to make mobility decisions for drone BSs.

Connected through hyperedge HE-1 (induced by source paper "trajectory design for multiple uav assisted wireless networks"):
  with members:
    - "adaptive deployment for uav aided communication networks"
    - "energy minimization for wireless communication with rotary wing uav"
    - "a tutorial on uavs for wireless networks applications challenges and open problems"
    - "survey on uav cellular communications practical aspects standardization advancements regulation and security challenges"
    - "placement optimization of uav mounted mobile base stations"
    - "joint trajectory and communication design for multi uav enabled wireless networks"
    - "mobile unmanned aerial vehicles uavs for energy efficient internet of things communications"
    - "coverage analysis for low altitude uav networks in urban environments"

Connected through hyperedge HE-2 (induced by source paper "underlay drone cell for temporary events impact of drone height and aerial channel environments"):
  with members:
    - "uav aided offloading for cellular hotspot"
    - "coverage and rate analysis for unmanned aerial vehicle base stations with los nlos propagation"
    - "uplink coverage performance of an underlay drone cell for temporary events"
    - "a tutorial on uavs for wireless networks applications challenges and open problems"
    - "joint trajectory and communication design for multi uav enabled wireless networks"
    - "coverage analysis for low altitude uav networks in urban environments"
    - "uplink performance analysis of a drone cell in a random field of ground interferers"
    - "coexistence of terrestrial and aerial users in cellular networks"

Connected through hyperedge HE-3 (induced by source paper "capacity characterization of uav enabled two user broadcast channel"):
  with members:
    - "the sky is not the limit lte for unmanned aerial vehicles"
    - "placement optimization of uav mounted mobile base stations"
    - "joint trajectory and communication design for multi uav enabled wireless networks"
    - "securing uav communications via trajectory optimization"
    - "power control in uav supported ultra dense networks communications caching and energy transfer"
    - "joint trajectory and communication design for uav enabled multiple access"
    - "uav enabled wireless power transfer trajectory design and energy optimization"
    - "cyclical multiple access in uav aided communications a throughput delay tradeoff"

Connected through hyperedge HE-4 (induced by source paper "uplink coverage performance of an underlay drone cell for temporary events"):
  with members:
    - "joint trajectory and communication design for multi uav enabled wireless networks"
    - "coverage analysis for low altitude uav networks in urban environments"
    - "coexistence of terrestrial and aerial users in cellular networks"
    - "spectrum sharing and cyclical multiple access in uav aided cellular offloading"
    - "coverage maximization for a poisson field of drone cells"
    - "joint altitude and beamwidth optimization for uav enabled multiuser communications"
    - "designing and implementing future aerial communication networks"
    - "the new frontier in ran heterogeneity multi tier drone cells"

Connected through hyperedge HE-5 (induced by source paper "a unified framework for joint mobility prediction and object profiling of drones in uav networks"):
  with members:
    - "on greedy routing in dynamic uav networks"
    - "optimal measurement policy for predicting uav network topology"
    - "a coalition formation approach to coordinated task allocation in heterogeneous uav networks"
    - "amateur drone monitoring state of the art architectures key enabling technologies and future research directions"
    - "survey of important issues in uav communication networks"
    - "dynamic routing for flying ad hoc networks"
    - "internet of things applications animal monitoring with unmanned aerial vehicle"
    - "machine learning in wireless sensor networks algorithms strategies and applications"

Connected through hyperedge HE-6 (induced by source paper "post disaster 4g 5g network rehabilitation using drones solving battery and backhaul issues"):
  with members:
    - "hybrid cell outage compensation in 5g networks sky ground approach"

Connected through hyperedge HE-7 (induced by source paper "service on demand drone base stations cruising in the cellular network"):
  with members:
    - "dynamic base station repositioning to improve performance of drone small cells"
    - "dynamic base station repositioning to improve spectral efficiency of drone small cells"
    - "please lower small cell antenna heights in 5g"
    - "user mobility evaluation for 5g small cell networks based on individual mobility model"
    - "towards understanding the fundamentals of mobility in cellular networks"

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)