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: "medium access control protocols for wireless sensor networks with energy harvesting"
  Abstract: The design of Medium Access Control (MAC) protocols for wireless sensor networks (WSNs) has been conventionally tackled by assuming battery-powered devices and by adopting the network lifetime as the main performance criterion. While WSNs operated by energy-harvesting (EH) devices are not limited by network lifetime, they pose new design challenges due to the uncertain amount of energy that can be harvested from the environment. Novel design criteria are thus required to capture the trade-offs between the potentially infinite network lifetime and the uncertain energy availability. This paper addresses the analysis and design of WSNs with EH devices by focusing on conventional MAC protocols, namely TDMA, framed-ALOHA (FA) and dynamic-FA (DFA), and by accounting for the performance trade-offs and design issues arising due to EH. A novel metric, referred to as delivery probability, is introduced to measure the capability of a MAC protocol to deliver the measurement of any sensor in the network to the intended destination (or fusion center, FC). The interplay between delivery efficiency and time efficiency (i.e., the data collection rate at the FC), is investigated analytically using Markov models. Numerical results validate the analysis and emphasize the critical importance of accounting for both delivery probability and time efficiency in the design of EH-WSNs.

Connected through hyperedge HE-1 (induced by source paper "proportional fairness in aloha networks with rf energy harvesting"):
  with members:
    - "massive machine type communications in 5g physical and mac layer solutions"
    - "wireless powered communication opportunities and challenges"
    - "on the stability of random multiple access with stochastic energy harvesting"
    - "stability analysis of slotted aloha with opportunistic rf energy harvesting"
    - "throughput maximization in wireless powered communication networks"
    - "asymptotically optimal power allocation for energy harvesting communication networks"
    - "optimal energy management policies for energy harvesting sensor nodes"
    - "a quantitative measure of fairness and discrimination for resource allocation in shared computer systems"

Connected through hyperedge HE-2 (induced by source paper "information exchange in randomly deployed dense wsns with wireless energy harvesting capabilities"):
  with members:
    - "spatial throughput characterization in cognitive radio networks with threshold based opportunistic spectrum access"
    - "simultaneous information and energy transfer in large scale networks with without relaying"
    - "energy cooperation in energy harvesting communications"
    - "wireless information and power transfer a dynamic power splitting approach"
    - "wireless information transfer with opportunistic energy harvesting"
    - "mimo broadcasting for simultaneous wireless information and power transfer"
    - "a tractable approach to coverage and rate in cellular networks"
    - "optimum transmission policies for battery limited energy harvesting nodes"

Connected through hyperedge HE-3 (induced by source paper "distributed opportunistic scheduling for energy harvesting based wireless networks a two stage probing approach"):
  with members:
    - "throughput maximization for the gaussian relay channel with energy harvesting constraints"
    - "optimal save then transmit protocol for energy harvesting wireless transmitters"
    - "optimal energy allocation for wireless communications with energy harvesting constraints"
    - "transmission with energy harvesting nodes in fading wireless channels optimal policies"

Connected through hyperedge HE-4 (induced by source paper "energy harvesting wireless communications a review of recent advances"):
  with members:
    - "renewable powered cellular networks energy field modeling and network coverage"
    - "dynamic compression transmission for energy harvesting multihop networks with correlated sources"
    - "constrained codes for joint energy and information transfer"
    - "energy harvesting broadband communication systems with processing energy cost"
    - "spatial throughput of mobile ad hoc networks powered by energy harvesting"
    - "energy cooperation in energy harvesting communications"
    - "interactive joint transfer of energy and information"
    - "opportunistic wireless energy harvesting in cognitive radio networks"

Connected through hyperedge HE-5 (induced by source paper "spatial throughput maximization of wireless powered communication networks"):
  with members:
    - "on spatial capacity of wireless ad hoc networks with threshold based scheduling"
    - "spatial throughput of mobile ad hoc networks powered by energy harvesting"
    - "throughput maximization in wireless powered communication networks"
    - "opportunistic wireless energy harvesting in cognitive radio networks"
    - "fundamentals of heterogeneous cellular networks with energy harvesting"
    - "downlink rate distribution in heterogeneous cellular networks under generalized cell selection"
    - "throughput optimal policies for energy harvesting wireless transmitters with non ideal circuit power"
    - "radio frequency energy harvesting and management for wireless sensor networks"

Connected through hyperedge HE-6 (induced by source paper "renewable powered cellular networks energy field modeling and network coverage"):
  with members:
    - "joint energy and spectrum cooperation for cellular communication systems"
    - "spatial throughput of mobile ad hoc networks powered by energy harvesting"
    - "opportunistic wireless energy harvesting in cognitive radio networks"
    - "throughput maximization for the gaussian relay channel with energy harvesting constraints"
    - "energy cooperation in cellular networks with renewable powered base stations"
    - "fundamentals of heterogeneous cellular networks with energy harvesting"
    - "enabling wireless power transfer in cellular networks architecture modeling and deployment"
    - "sum rate optimal power policies for energy harvesting transmitters in an interference channel"

Connected through hyperedge HE-7 (induced by source paper "optimal adaptive random multiaccess in energy harvesting wireless sensor networks"):
  with members:
    - "cross layer design of distributed sensing estimation with quality feedback part i optimal schemes"
    - "dynamic compression transmission for energy harvesting multihop networks with correlated sources"
    - "solarstat modeling photovoltaic sources through stochastic markov processes"
    - "asymptotically optimal power allocation for energy harvesting communication networks"
    - "transmission with energy harvesting nodes in fading wireless channels optimal policies"
    - "optimal energy management policies for energy harvesting sensor nodes"
    - "efficient energy management policies for networks with energy harvesting sensor nodes"

Connected through hyperedge HE-8 (induced by source paper "on the stability of random multiple access with stochastic energy harvesting"):
  with members:
    - "neighbor discovery in a wireless sensor network multipacket reception capability and physical layer signal processing"
    - "optimal utilization of a cognitive shared channel with a rechargeable primary source node"
    - "information theoretic analysis of an energy harvesting communication system"
    - "efficient energy management policies for networks with energy harvesting sensor nodes"
    - "asymptotic stability region of slotted aloha"

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)