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: "optimal power allocation for energy harvesting and power grid coexisting wireless communication systems"
  Abstract: This paper considers the power allocation of a single-link wireless communication with joint energy harvesting and grid power supply. We formulate the problem as minimizing the grid power consumption with random energy and data arrival, and analyze the structure of the optimal power allocation policy in some special cases. For the case that all the packets are arrived before transmission, it is a dual problem of throughput maximization, and the optimal solution is found by the two-stage water filling (WF) policy, which allocates the harvested energy in the first stage, and then allocates the power grid energy in the second stage. For the random data arrival case, we first assume grid energy or harvested energy supply only, and then combine the results to obtain the optimal structure of the coexisting system. Specifically, the reverse multi-stage WF policy is proposed to achieve the optimal power allocation when the battery capacity is infinite. Finally, some heuristic online schemes are proposed, of which the performance is evaluated by numerical simulations.

Connected through hyperedge HE-1 (induced by source paper "flexible functional split and power control for energy harvesting cloud radio access networks"):
  with members:
    - "optimal placement of baseband functions for energy harvesting virtual small cells"
    - "on the fronthaul statistical multiplexing gain"
    - "online ski rental for on off scheduling of energy harvesting base stations"
    - "greendelivery proactive content caching and push with energy harvesting based small cells"
    - "redesigning fronthaul for next generation networks beyond baseband samples and point to point links"
    - "5g wireless backhaul networks challenges and research advances"
    - "energy harvesting broadband communication systems with processing energy cost"
    - "transmission with energy harvesting nodes in fading wireless channels optimal policies"

Connected through hyperedge HE-2 (induced by source paper "a survey on mobile edge computing the communication perspective"):
  with members:
    - "mobile edge computing fog et al a survey and analysis of security threats and challenges"
    - "joint energy minimization and resource allocation in c ran with mobile cloud"
    - "latency optimization for resource allocation in mobile edge computation offloading"
    - "a survey on mobile edge networks convergence of computing caching and communications"
    - "proactive edge computing in latency constrained fog networks"
    - "computation peer offloading for energy constrained mobile edge computing in small cell networks"
    - "mobile edge computing a survey on architecture and computation offloading"
    - "online placement of multi component applications in edge computing environments"

Connected through hyperedge HE-3 (induced by source paper "backhaul aware user association and resource allocation for energy constrained hetnets"):
  with members:
    - "joint downlink cell association and bandwidth allocation for wireless backhauling in two tier hetnets with large scale antenna arrays"
    - "energy harvesting wireless communications a review of recent advances"
    - "5g wireless backhaul networks challenges and research advances"
    - "a traffic load balancing framework for software defined radio access networks powered by hybrid energy sources"
    - "an overview of load balancing in hetnets old myths and open problems"
    - "distributed pricing based user association for downlink heterogeneous cellular networks"
    - "unified and distributed qos driven cell association algorithms in heterogeneous networks"
    - "distributed resource allocation for relay aided device to device communication a message passing approach"

Connected through hyperedge HE-4 (induced by source paper "reconstruction of correlated sources with energy harvesting constraints in delay constrained and delay tolerant communication scenarios"):
  with members:
    - "energy harvesting wireless communications a review of recent advances"
    - "a general utility optimization framework for energy harvesting based wireless communications"
    - "dynamic compression transmission for energy harvesting multihop networks with correlated sources"
    - "energy neutral source channel coding with battery and memory size constraints"
    - "throughput optimal policies for energy harvesting wireless transmitters with non ideal circuit power"
    - "energy management policies for energy neutral source channel coding"
    - "a general framework for the optimization of energy harvesting communication systems with battery imperfections"
    - "transmission with energy harvesting nodes in fading wireless channels optimal policies"

Connected through hyperedge HE-5 (induced by source paper "grid energy consumption and qos tradeoff in hybrid energy supply wireless networks"):
  with members:
    - "transmit power minimization for wireless networks with energy harvesting relays"
    - "energy harvesting wireless communications a review of recent advances"
    - "comp meets smart grid a new communication and energy cooperation paradigm"
    - "energy harvesting small cell networks feasibility deployment and operation"
    - "a lyapunov optimization approach for green cellular networks with hybrid energy supplies"
    - "cost minimization for fading channels with energy harvesting and conventional energy"
    - "power allocation for conventional and buffer aided link adaptive relaying systems with energy harvesting nodes"
    - "multiuser joint energy bandwidth allocation with energy harvesting part i optimum algorithm multiple point to point channels"

Connected through hyperedge HE-6 (induced by source paper "policy optimization for content push via energy harvesting small cells in heterogeneous networks"):
  with members:
    - "stochastic content centric multicast scheduling for cache enabled heterogeneous cellular networks"
    - "wireless caching technical misconceptions and business barriers"
    - "on the tradeoff between energy harvesting and caching in wireless networks"
    - "greendelivery proactive content caching and push with energy harvesting based small cells"
    - "proactive push with energy harvesting based small cells in heterogeneous networks"
    - "energy harvesting small cell networks feasibility deployment and operation"
    - "learning based optimization of cache content in a small cell base station"
    - "multicast aware caching for small cell networks"

Connected through hyperedge HE-7 (induced by source paper "joint energy bandwidth allocation for multi user channels with cooperating hybrid energy nodes"):
  with members:
    - "iterative dynamic water filling for fading multiple access channels with energy harvesting"
    - "comp meets smart grid a new communication and energy cooperation paradigm"
    - "joint energy and spectrum cooperation for cellular communication systems"
    - "energy cooperation in energy harvesting communications"
    - "throughput maximization for the gaussian relay channel with energy harvesting constraints"
    - "energy cooperation in cellular networks with renewable powered base stations"
    - "relaying protocols for wireless energy harvesting and information processing"
    - "decentralized delay optimal control for interference networks with limited renewable energy storage"

Connected through hyperedge HE-8 (induced by source paper "wireless information and power transfer design for energy cooperation distributed antenna systems"):
  with members:
    - "throughput optimization for massive mimo systems powered by wireless energy transfer"
    - "multiuser mimo wireless energy transfer with coexisting opportunistic communication"
    - "energy beamforming with one bit feedback"
    - "cost minimization for fading channels with energy harvesting and conventional energy"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "cost aware green cellular networks with energy and communication cooperation"
    - "multi antenna wireless powered communication with energy beamforming"
    - "wireless information transfer with opportunistic energy harvesting"

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)