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: "a discrete time switching protocol for wireless powered communications with energy accumulation"
  Abstract: This paper investigates a wireless-powered communication network (WPCN) setup with one multi-antenna access point (AP) and one single-antenna source. It is assumed that the AP is connected to an external power supply, while the source does not have an embedded energy supply. But the source could harvest energy from radio frequency (RF) signals sent by the AP and store it for future information transmission. We develop a discrete time-switching (DTS) protocol for the considered WPCN. In the proposed protocol, either energy harvesting (EH) or information transmission (IT) operation is performed during each transmission block. Specifically, based on the channel state information (CSI) between source and AP, the source can determine the minimum energy required for an outage-free IT operation. If the residual energy of the source is sufficient, the source will start the IT phase. Otherwise, EH phase is invoked and the source accumulates the harvested energy. To characterize the performance of the proposed protocol, we adopt a discrete Markov chain (MC) to model the energy accumulation process at the source battery. A closed-form expression for the average throughput of the DTS protocol is derived. Numerical results validate our theoretical analysis and show that the proposed DTS protocol considerably outperforms the existing harvest-then-transmit protocol when the battery capacity at the source is large.

Connected through hyperedge HE-1 (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"
    - "relay selection in wireless powered cooperative networks with energy storage"
    - "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-2 (induced by source paper "performance of energy buffer aided incremental relaying in cooperative networks"):
  with members:
    - "incremental accumulate then forward relaying in wireless energy harvesting cooperative networks"
    - "wireless powered communication networks an overview"
    - "performance of adaptive link selection with buffer aided relays in underlay cognitive networks"
    - "energy harvesting two hop communication networks"
    - "on off transmission policy for wireless powered communication with energy storage"
    - "performance analysis of wireless powered communication with finite infinite energy storage"
    - "relaying protocols for wireless energy harvesting and information processing"
    - "buffer aided relaying with adaptive link selection fixed and mixed rate transmission"

Connected through hyperedge HE-3 (induced by source paper "performance analysis of energy buffer aided wireless powered communication"):
  with members:
    - "wireless powered communication networks an overview"
    - "resource allocation techniques for wireless powered communication networks with energy storage constraint"
    - "on off transmission policy for wireless powered communication with energy storage"
    - "throughput maximization in wireless powered communication networks"
    - "on online energy harvesting in multiple access communication systems"
    - "wireless information and power transfer architecture design and rate energy tradeoff"

Connected through hyperedge HE-4 (induced by source paper "full duplex cooperative cognitive radio networks with wireless energy harvesting"):
  with members:
    - "cooperative strategies for wireless powered communications"
    - "ergodic capacity comparison of different relay precoding schemes in dual hop af systems with co channel interference"
    - "full duplex cooperative cognitive radio with transmit imperfections"
    - "wireless information and power transfer architecture design and rate energy tradeoff"

Connected through hyperedge HE-5 (induced by source paper "wireless powered two way relaying with power splitting based energy accumulation"):
  with members:
    - "relay selection in wireless powered cooperative networks with energy storage"
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "wireless powered communications performance analysis and optimization"
    - "time switching based swipt for network coded two way relay transmission with data rate fairness"
    - "relaying protocols for wireless energy harvesting and information processing"
    - "wireless information and power transfer in two way amplify and forward relaying channels"

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)