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 information and energy cooperation in energy harvesting cognitive radio"
  Abstract: This paper considers the cooperation between primary and secondary users at information and energy levels when both users are energy harvesting nodes. In particular, a secondary transmitter helps relaying the primary message, and in turn, gains the spectrum access as a reward. Also, the primary transmitter supplies energy to the secondary transmitter if the latter is energy-constrained, which facilitates an uninterrupted cooperation. We address this two-level cooperation over a finite horizon with the finite battery constraint at the secondary transmitter. While promising the rate-guaranteed service to both primary and secondary users, we aim to maximize the primary rate. We develop an iterative algorithm that obtains the optimal offline power policies for primary and secondary users. To acquire insights about the structure of the optimal solution, we examine specific scenarios. Furthermore, we investigate the effects of the secondary rate constraint and finite battery on the primary rate and the probability of cooperation. We show that the joint information and energy cooperation increases the chances of cooperation and achieves significant rate gains over only information cooperation.

Connected through hyperedge HE-1 (induced by source paper "optimal harvest or transmit strategy for energy harvesting underlay cognitive radio network"):
  with members:
    - "on energy cooperation in energy harvesting underlay cognitive radio network"
    - "optimal time sharing in underlay cognitive radio systems with rf energy harvesting"
    - "information and energy cooperation in cognitive radio networks"
    - "on green energy powered cognitive radio networks"

Connected through hyperedge HE-2 (induced by source paper "resource allocation and fairness in wireless powered cooperative cognitive radio networks"):
  with members:
    - "wireless powered communication opportunities and challenges"
    - "placement optimization of energy and information access points in wireless powered communication networks"
    - "cognitive wireless powered network spectrum sharing models and throughput maximization"
    - "optimum wirelessly powered relaying"
    - "harvest then cooperate wireless powered cooperative communications"
    - "user cooperation in wireless powered communication networks"
    - "information and energy cooperation in cognitive radio networks"
    - "optimal resource allocation in full duplex wireless powered communication network"

Connected through hyperedge HE-3 (induced by source paper "on energy cooperation in energy harvesting underlay cognitive radio network"):
  with members:
    - "optimal time sharing in underlay cognitive radio systems with rf energy harvesting"
    - "information and energy cooperation in cognitive radio networks"
    - "energy harvesting cognitive radio with channel aware sensing strategy"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "on green energy powered cognitive radio networks"
    - "cognitive energy harvesting and transmission from a network perspective"
    - "optimal random access and random spectrum sensing for an energy harvesting cognitive radio"
    - "optimal utilization of a cognitive shared channel with a rechargeable primary source node"

Connected through hyperedge HE-4 (induced by source paper "on optimal offline time sharing policy for energy harvesting underlay cognitive radio"):
  with members:
    - "optimal time sharing in underlay cognitive radio systems with rf energy harvesting"
    - "information and energy cooperation in cognitive radio networks"
    - "energy harvesting cognitive radio with channel aware sensing strategy"
    - "throughput maximization in wireless powered communication networks"
    - "cognitive energy harvesting and transmission from a network perspective"

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)