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: "an adaptive transmission protocol for wireless powered cooperative communications"
  Abstract: In this paper, we consider a wireless-powered cooperative communication network, which consists of one hybrid access point (AP), one source and one relay to assist information transmission. Unlike conventional cooperative networks, the source and relay are assumed to have no embedded energy supplies in the considered system. Hence, they need to first harvest energy from the radio-frequency (RF) signals radiated by the AP in the downlink (DL) before information transmission in the uplink (UL). Inspired by the recently proposed harvest-then-transmit (HTT) and harvest-then-cooperate (HTC) protocols, we develop a new adaptive transmission (AT) protocol. In the proposed protocol, at the beginning of each transmission block, the AP charges the source. AP and source then perform channel estimation to acquire the channel state information (CSI) between them. Based on the CSI estimate, the AP adaptively chooses the source to perform UL information transmission either directly or cooperatively with the relay. We derive an approximate closed-form expression for the average throughput of the proposed AT protocol over Nakagami-m fading channels. The analysis is then verified by Monte Carlo simulations. Results show that the proposed AT protocol considerably outperforms both the HTT and HTC protocols.

Connected through hyperedge HE-1 (induced by source paper "relay selection scheduling and power control in wireless powered cooperative communication networks"):
  with members:
    - "rf based energy harvesting in decode and forward relaying systems ergodic and outage capacities"
    - "harvest then cooperate wireless powered cooperative communications"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "full duplex wireless powered communication network with energy causality"
    - "simultaneous information and energy transfer in large scale networks with without relaying"
    - "throughput maximization in wireless powered communication networks"

Connected through hyperedge HE-2 (induced by source paper "finite horizon throughput maximization and sensing optimization in wireless powered devices over fading channels"):
  with members:
    - "a survey on mobile edge computing the communication perspective"
    - "a tutorial on thompson sampling"
    - "computation rate maximization for wireless powered mobile edge computing"
    - "non orthogonal multiple access schemes in wireless powered communication networks"
    - "user cooperation for enhanced throughput fairness in wireless powered communication networks"
    - "battery powered devices in wpcns"
    - "on optimal policies in full duplex wireless powered communication networks"
    - "optimum wirelessly powered relaying"

Connected through hyperedge HE-3 (induced by source paper "on the performance of multi antenna wireless powered communications with energy beamforming"):
  with members:
    - "resource allocation in wireless networks with rf energy harvesting and transfer"
    - "wireless powered communication opportunities and challenges"
    - "harvest then cooperate wireless powered cooperative communications"
    - "wireless powered cooperative communications via a hybrid relay"
    - "user cooperation in wireless powered communication networks"
    - "multi user scheduling schemes for simultaneous wireless information and power transfer over fading channels"
    - "power allocation strategies in energy harvesting wireless cooperative networks"
    - "optimized training design for wireless energy transfer"

Connected through hyperedge HE-4 (induced by source paper "distributed and optimal resource allocation for power beacon assisted wireless powered communications"):
  with members:
    - "on the performance of multi antenna wireless powered communications with energy beamforming"
    - "wireless powered communication opportunities and challenges"
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "collaborative wireless energy and information transfer in interference channel"
    - "enhancing wireless information and power transfer by exploiting multi antenna techniques"
    - "harvest then cooperate wireless powered cooperative communications"
    - "user cooperation in wireless powered communication networks"
    - "cutting last wires for mobile communication by microwave power transfer"

Connected through hyperedge HE-5 (induced by source paper "a discrete time switching protocol for wireless powered communications with energy accumulation"):
  with members:
    - "on the performance of multi antenna wireless powered communications with energy beamforming"
    - "harvest then cooperate wireless powered cooperative communications"
    - "throughput maximization in wireless powered communication networks"
    - "multi antenna wireless powered communication with energy beamforming"

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)