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: "relay selection in wireless powered cooperative networks with energy storage"
  Abstract: This paper deals with the problem of relay selection in wireless powered cooperative networks where spatially random relays are equipped with energy storage devices, e.g., batteries. In contrast to conventional techniques and in order to reduce complexity, the relay nodes can either harvest energy from the source signal (in case of uncharged battery) or attempt to decode and forward it (in case of charged battery). Several relay selection schemes that correspond to different state information requirements and implementation complexities are proposed. The charging/discharging behavior of the battery is modeled as a two-state Markov chain and analytical expressions for the steady-state distribution and the outage probability performance are derived for each relay selection scheme. We prove that energy storage significantly affects the performance of the system and results in a zeroth diversity gain at high signal-to-noise ratios; the convergence floors depend on the steady-state distribution of the battery and are derived in closed form by using appropriate approximations. The proposed relay selection schemes are generalized to a large-scale network with multiple access points (APs), where relays assist the closest AP and suffer from multiuser interference.

Connected through hyperedge HE-1 (induced by source paper "common throughput maximization for uav enabled interference channel with wireless powered communications"):
  with members:
    - "uav communications for 5g and beyond recent advances and future trends"
    - "fundamentals of wireless information and power transfer from rf energy harvester models to signal and system designs"
    - "capacity characterization of uav enabled two user broadcast channel"
    - "cellular enabled uav communication a connectivity constrained trajectory optimization perspective"
    - "optimal 1d trajectory design for uav enabled multiuser wireless power transfer"
    - "minimum throughput maximization in uav aided wireless powered communication networks"
    - "a tutorial on uavs for wireless networks applications challenges and open problems"
    - "uav enabled wireless power transfer with directional antenna a two user case"

Connected through hyperedge HE-2 (induced by source paper "delay outage probability of multi relay selection for mobile relay edge computing systems"):
  with members:
    - "joint computation and communication cooperation for energy efficient mobile edge computing"
    - "a survey on mobile edge computing the communication perspective"
    - "dynamic computation offloading for mobile edge computing with energy harvesting devices"
    - "fog computing based radio access networks issues and challenges"
    - "the three primary colors of mobile systems"
    - "energy efficient resource allocation for mobile edge computation offloading"
    - "diversity multiplexing tradeoffs in mimo relay channels"

Connected through hyperedge HE-3 (induced by source paper "performance analysis of energy harvesting underlay cooperative cognitive radio relay networks with randomly located nodes"):
  with members:
    - "interference aided energy harvesting cognitive relaying with multiple primary transceivers"
    - "wireless energy harvesting in a cognitive relay network"
    - "rf powered cognitive radio networks technical challenges and limitations"
    - "wireless information and power transfer in relay systems with multiple antennas and interference"
    - "opportunistic wireless energy harvesting in cognitive radio networks"
    - "relaying protocols for wireless energy harvesting and information processing"
    - "mimo broadcasting for simultaneous wireless information and power transfer"

Connected through hyperedge HE-4 (induced by source paper "accumulate then transmit multi user scheduling in full duplex wireless powered iot systems"):
  with members:
    - "optimal joint power and subcarrier allocation for full duplex multicarrier non orthogonal multiple access systems"
    - "wireless powered communication networks an overview"
    - "accumulate and jam towards secure communication via a wireless powered full duplex jammer"
    - "a discrete time switching protocol for wireless powered communications with energy accumulation"
    - "harvest then cooperate wireless powered cooperative communications"
    - "optimal resource allocation in full duplex wireless powered communication network"
    - "energy beamforming with one bit feedback"
    - "analysis of oscillator phase noise effects on self interference cancellation in full duplex ofdm radio transceivers"

Connected through hyperedge HE-5 (induced by source paper "group cooperation with optimal resource allocation in wireless powered communication networks"):
  with members:
    - "resource allocation and fairness in wireless powered cooperative cognitive radio networks"
    - "wireless powered communication networks an overview"
    - "wireless powered cooperative communications power splitting relaying with energy accumulation"
    - "wireless powered communication opportunities and challenges"
    - "resource allocation techniques for wireless powered communication networks with energy storage constraint"
    - "energy harvesting wireless communications a review of recent advances"
    - "placement optimization of energy and information access points in wireless powered communication networks"
    - "collaborative wireless energy and information transfer in interference channel"

Connected through hyperedge HE-6 (induced by source paper "power availability aware cell association for energy harvesting small cell base stations"):
  with members:
    - "distributed user association in energy harvesting small cell networks an exchange economy with uncertainty"
    - "distributed user association in energy harvesting small cell networks a probabilistic bandit model"
    - "distributed multi relay selection in accumulate then forward energy harvesting relay networks"
    - "user association in 5g networks a survey and an outlook"
    - "online ski rental for on off scheduling of energy harvesting base stations"
    - "a survey of energy efficient techniques for 5g networks and challenges ahead"
    - "ambient rf energy harvesting in ultra dense small cell networks performance and trade offs"
    - "millimeter wave energy harvesting"

Connected through hyperedge HE-7 (induced by source paper "distributed multi relay selection in accumulate then forward energy harvesting relay networks"):
  with members:
    - "wireless powered communication opportunities and challenges"
    - "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis"
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "full duplex mimo relaying powered by wireless energy transfer"
    - "wireless powered communications performance analysis and optimization"
    - "joint power splitting and antenna selection in energy harvesting relay channels"
    - "wireless information and energy transfer for two hop non regenerative mimo ofdm relay networks"
    - "wireless information and power transfer in relay systems with multiple antennas and interference"

Connected through hyperedge HE-8 (induced by source paper "on wireless energy and information transfer in relay networks"):
  with members:
    - "rf based energy harvesting in decode and forward relaying systems ergodic and outage capacities"
    - "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis"
    - "joint power splitting and antenna selection in energy harvesting relay channels"
    - "outage minimization for a fading wireless link with energy harvesting transmitter and receiver"
    - "harvest then cooperate wireless powered cooperative communications"
    - "wireless powered cooperative communications via a hybrid relay"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "outage probability of energy harvesting relay aided cooperative networks over rayleigh fading channel"

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.IT(Information Theory)