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: "on the transfer of information and energy in multi user systems"
  Abstract: The problem of joint transfer of information and energy for wireless links has been recently investigated in light of emerging applications such as RFID and body area networks. Specifically, recent work has shown that the additional requirements of providing sufficient energy to the receiver significantly affects the design of the optimal communication strategy. In contrast to most previous works, this letter focuses on baseline multi-user systems, namely multiple access and multi-hop channels, and demonstrates that energy transfer constraints call for additional coordination among distributed nodes of a wireless network. The analysis is carried out using information-theoretic tools, and specific examples are worked out to illustrate the main conclusions.

Connected through hyperedge HE-1 (induced by source paper "energy sustainable paradigms and methods for future mobile networks a survey"):
  with members:
    - "information exchange in randomly deployed dense wsns with wireless energy harvesting capabilities"
    - "a stochastic geometry based demand response management framework for cellular networks powered by smart grid"
    - "fog computing based radio access networks issues and challenges"
    - "a hybrid energy sharing framework for green cellular networks"
    - "recent advances in cloud radio access networks system architectures key techniques and open issues"
    - "green networking in cellular hetnets a unified radio resource management framework with base station on off switching"
    - "online ski rental for on off scheduling of energy harvesting base stations"
    - "dynamic clustering and on off strategies for wireless small cell networks"

Connected through hyperedge HE-2 (induced by source paper "optimal and near optimal policies for wireless power transfer in energy limited and power limited scenarios"):
  with members:
    - "battery powered devices in wpcns"
    - "wireless power transfer survey and roadmap"
    - "distributed energy beamforming with one bit feedback"
    - "recent advances in joint wireless energy and information transfer"
    - "user cooperation in wireless powered communication networks"
    - "optimal resource allocation in full duplex wireless powered communication network"
    - "energy beamforming with one bit feedback"
    - "optimized training design for wireless energy transfer"

Connected through hyperedge HE-3 (induced by source paper "information and energy transmission with experimentally sampled harvesting functions"):
  with members:
    - "fundamentals of wireless information and power transfer from rf energy harvester models to signal and system designs"
    - "multicasting energy and information simultaneously"
    - "wireless information and power transfer over an awgn channel nonlinearity and asymmetric gaussian signaling"
    - "wireless information and power transfer nonlinearity waveform design and rate energy tradeoff"
    - "practical non linear energy harvesting model and resource allocation for swipt systems"
    - "feedback enhances simultaneous wireless information and energy transmission in multiple access channels"
    - "wireless information and power transfer architecture design and rate energy tradeoff"

Connected through hyperedge HE-4 (induced by source paper "multicasting energy and information simultaneously"):
  with members:
    - "fundamentals of wireless information and power transfer from rf energy harvester models to signal and system designs"
    - "skip sliding window codes"
    - "communications and signals design for wireless power transmission"
    - "subblock constrained codes for real time simultaneous energy and information transfer"
    - "optimal grouping for group minimax hypothesis testing"
    - "wireless information transfer with opportunistic energy harvesting"
    - "mimo broadcasting for simultaneous wireless information and power transfer"

Connected through hyperedge HE-5 (induced by source paper "ultra reliable short message relaying with wireless power transfer"):
  with members:
    - "finite blocklength performance of multi terminal wireless industrial networks"
    - "analysis of wireless communications with finite blocklength and imperfect channel knowledge"
    - "on wirelessly powered communications with short packets"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "power allocation strategies in energy harvesting wireless cooperative networks"
    - "ultra reliable communication in 5g wireless systems"
    - "simultaneous information and power transfer for broadband wireless systems"
    - "relaying protocols for wireless energy harvesting and information processing"

Connected through hyperedge HE-6 (induced by source paper "generalised precoded spatial modulation for integrated wireless information and power transfer"):
  with members:
    - "localisation communication and networking with vlc challenges and opportunities"
    - "adaptive coding and modulation for large scale antenna array based aeronautical communications in the presence of co channel interference"
    - "synthesis and optimization of reversible circuits a survey"
    - "interactive joint transfer of energy and information"
    - "wireless information and power transfer a dynamic power splitting approach"
    - "wireless information transfer with opportunistic energy harvesting"
    - "large system analysis of linear precoding in correlated miso broadcast channels under limited feedback"
    - "robust beamforming for wireless information and power transmission"

Connected through hyperedge HE-7 (induced by source paper "joint transfer of energy and information in a two hop relay channel"):
  with members:
    - "a survey of energy efficient techniques for 5g networks and challenges ahead"
    - "constrained codes for joint energy and information transfer"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "interactive joint transfer of energy and information"
    - "binary energy harvesting channel with finite energy storage"
    - "information theoretic analysis of an energy harvesting communication system"

Connected through hyperedge HE-8 (induced by source paper "robust transceiver design for miso interference channel with energy harvesting"):
  with members:
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "secure beamforming for mimo broadcasting with wireless information and power transfer"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "joint transmit beamforming and receive power splitting for miso swipt systems"
    - "beamforming for miso interference channels with qos and rf energy transfer"
    - "interactive joint transfer of energy and information"
    - "wireless information and power transfer a dynamic power splitting approach"
    - "two way communication with energy exchange"

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)