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: "greendelivery proactive content caching and push with energy harvesting based small cells"
  Abstract: The explosive growth of mobile multimedia traffic calls for scalable wireless access with high quality of service and low energy cost. Motivated by the emerging energy harvesting communications, and the trend of caching multimedia contents at the access edge and user terminals, we propose a paradigm shifting framework, GreenDelivery, enabling efficient content delivery with energy harvesting based small cells. To resolve the two-dimensional randomness of energy harvesting and content request arrivals, proactive caching and push are jointly optimized, with respect to the content popularity distribution and battery states. We thus develop a novel way of understanding the interplay between content and energy over time and space. Case studies are provided to show the substantial reduction of macro BS activities, and thus the related energy consumption from the power grid is reduced. Research issues of the proposed GreenDelivery framework are also discussed.

Connected through hyperedge HE-1 (induced by source paper "on the effective throughput of coded caching a game theoretic perspective"):
  with members:
    - "the exact rate memory tradeoff for caching with uncoded prefetching"
    - "energy efficiency gains of caching for interference channels"
    - "caching meets millimeter wave communications for enhanced mobility management in 5g networks"
    - "on coded caching in the overloaded miso broadcast channel"
    - "a survey on low latency towards 5g ran core network and caching solutions"
    - "cost optimal caching for d2d networks with user mobility modeling analysis and computational approaches"
    - "caching at the wireless edge design aspects challenges and future directions"
    - "a stackelberg game for incentive proactive caching mechanisms in wireless networks"

Connected through hyperedge HE-2 (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"
    - "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"
    - "optimal power allocation for energy harvesting and power grid coexisting wireless communication systems"
    - "transmission with energy harvesting nodes in fading wireless channels optimal policies"

Connected through hyperedge HE-3 (induced by source paper "beamforming design for max min fair swipt in green cloud ran with wireless fronthaul"):
  with members:
    - "energy throughput tradeoff in sustainable cloud ran with energy harvesting"
    - "joint millimeter wave fronthaul and ofdma resource allocation in ultra dense cran"
    - "secure and green swipt in distributed antenna networks with limited backhaul capacity"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "sparse beamforming and user centric clustering for downlink cloud radio access network"
    - "group sparse beamforming for green cloud ran"
    - "coordinated multicast beamforming in multicell networks"

Connected through hyperedge HE-4 (induced by source paper "downlink user association and uplink scheduling for energy harvesting users in software defined mobile networks"):
  with members:
    - "user association in massive mimo hetnets"
    - "energy efficient precoding design for swipt in mimo two way relay networks"
    - "energy efficiency in massive mimo based 5g networks opportunities and challenges"
    - "software defined and virtualized future mobile and wireless networks a survey"

Connected through hyperedge HE-5 (induced by source paper "cost effective cache deployment in mobile heterogeneous networks"):
  with members:
    - "on optimal geographical caching in heterogeneous cellular networks"
    - "cache size allocation in backhaul limited wireless networks"
    - "a learning based approach to caching in heterogenous small cell networks"
    - "optimal caching and user association in cache enabled heterogeneous wireless networks"
    - "on the delay of geographical caching methods in two tiered heterogeneous networks"
    - "mobility aware caching for content centric wireless networks modeling and methodology"
    - "wireless content caching for small cell and d2d networks"
    - "energy efficiency of downlink networks with caching at base stations"

Connected through hyperedge HE-6 (induced by source paper "spatial alignment of coding and modulation helps content delivery"):
  with members:
    - "sinr outage evaluation in cellular networks saddle point approximation spa using normal inverse gaussian nig distribution"
    - "effect of user mobility on the performance of device to device networks with distributed caching"
    - "content delivery in erasure broadcast channels with cache and feedback"
    - "wireless device to device caching networks basic principles and system performance"
    - "wireless caching technical misconceptions and business barriers"
    - "analysis and optimization of caching and multicasting in large scale cache enabled heterogeneous wireless networks"
    - "cooperative caching and transmission design in cluster centric small cell networks"
    - "cache enabled heterogeneous cellular networks optimal tier level content placement"

Connected through hyperedge HE-7 (induced by source paper "mitigating interference in content delivery networks by spatial signal alignment the approach of shot noise ratio"):
  with members:
    - "sinr outage evaluation in cellular networks saddle point approximation spa using normal inverse gaussian nig distribution"
    - "effect of user mobility on the performance of device to device networks with distributed caching"
    - "optimal geographic caching in finite wireless networks"
    - "content delivery in erasure broadcast channels with cache and feedback"
    - "wireless device to device caching networks basic principles and system performance"
    - "wireless caching technical misconceptions and business barriers"
    - "cooperative caching and transmission design in cluster centric small cell networks"
    - "cache enabled heterogeneous cellular networks optimal tier level content placement"

Connected through hyperedge HE-8 (induced by source paper "cooperative edge caching in user centric clustered mobile networks"):
  with members:
    - "cost effective cache deployment in mobile heterogeneous networks"
    - "policy optimization for content push via energy harvesting small cells in heterogeneous networks"
    - "on optimal geographical caching in heterogeneous cellular networks"
    - "on the delay of geographical caching methods in two tiered heterogeneous networks"
    - "octopus a cooperative hierarchical caching strategy for cloud radio access networks"
    - "mobility aware caching for content centric wireless networks modeling and methodology"
    - "caching placement in stochastic wireless caching helper networks channel selection diversity via caching"
    - "cooperative caching and transmission design in cluster centric small cell networks"

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)