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: "cache enabled device to device communications offloading gain and energy cost"
  Abstract: By caching files at users, content delivery traffic can be offloaded via device-to-device (D2D) links if a helper user is willing to transmit the cached file to the user who requests the file. In practice, the user device has limited battery capacity, and may terminate the D2D connection when its battery has little energy left. Thus, taking the battery consumption allowed by the helper users to support D2D into account introduces a reduction in the possible amount of offloading. In this paper, we investigate the relationship between offloading gain of the system and energy cost of each helper user. To this end, we introduce a user-centric protocol to control the energy cost for a helper user to transmit the file. Then, we optimize the proactive caching policy to maximize the offloading opportunity and the transmit power at each helper to maximize the offloading probability. Finally, we evaluate the overall amount of traffic offloaded to D2D links and the average energy consumption at each helper, with the optimized caching policy and transmit power. Simulations show that a significant amount of traffic can be offloaded even when the energy cost is kept low.

Connected through hyperedge HE-1 (induced by source paper "individual preference aware caching policy design in wireless d2d networks"):
  with members:
    - "throughput outage analysis and evaluation of cache aided d2d networks with measured popularity distributions"
    - "modeling and performance analysis of full duplex communications in cache enabled d2d networks"
    - "learning based delay aware caching in wireless d2d caching networks"
    - "caching policy optimization for d2d communications by learning user preference"
    - "high throughput opportunistic cooperative device to device communications with caching"
    - "on consideration of content preference and sharing willingness in d2d assisted offloading"
    - "optimizing content caching to maximize the density of successful receptions in device to device networking"
    - "caching at the wireless edge design aspects challenges and future directions"

Connected through hyperedge HE-2 (induced by source paper "throughput outage analysis and evaluation of cache aided d2d networks with measured popularity distributions"):
  with members:
    - "modeling and performance analysis of full duplex communications in cache enabled d2d networks"
    - "performance of caching based d2d video distribution with measured popularity distributions"
    - "high throughput opportunistic cooperative device to device communications with caching"
    - "cost optimal caching for d2d networks with user mobility modeling analysis and computational approaches"
    - "spatially correlated content caching for device to device communications"
    - "optimizing content caching to maximize the density of successful receptions in device to device networking"
    - "wireless device to device caching networks basic principles and system performance"
    - "a learning based approach to caching in heterogenous small cell networks"

Connected through hyperedge HE-3 (induced by source paper "wireless caching helper system with heterogeneous traffic and random availability"):
  with members:
    - "modeling and performance analysis of full duplex communications in cache enabled d2d networks"
    - "a survey on mobile edge networks convergence of computing caching and communications"
    - "optimal caching and scheduling for cache enabled d2d communications"
    - "spatially correlated content caching for device to device communications"
    - "wireless caching technical misconceptions and business barriers"
    - "on the delay of geographical caching methods in two tiered heterogeneous networks"
    - "content caching and distribution in smart grid enabled wireless networks"
    - "energy efficiency of downlink networks with caching at base stations"

Connected through hyperedge HE-4 (induced by source paper "economical caching for scalable videos in cache enabled heterogeneous networks"):
  with members:
    - "optimized base station cache allocation for cloud radio access network with multicast backhaul"
    - "cost effective cache deployment in mobile heterogeneous networks"
    - "random caching based cooperative transmission in heterogeneous wireless networks"
    - "fundamental tradeoff between storage and latency in cache aided wireless interference networks"
    - "cache enabled physical layer security for video streaming in backhaul limited cellular networks"
    - "modeling analysis and optimization of coded caching in small cell networks"
    - "stochastic content centric multicast scheduling for cache enabled heterogeneous cellular networks"
    - "caching in wireless small cell networks a storage bandwidth tradeoff"

Connected through hyperedge HE-5 (induced by source paper "caching policy for cache enabled d2d communications by learning user preference"):
  with members:
    - "caching policy optimization for d2d communications by learning user preference"
    - "modeling analysis and optimization of coded caching in small cell networks"
    - "caching at the wireless edge design aspects challenges and future directions"
    - "wireless device to device caching networks basic principles and system performance"
    - "energy efficiency of downlink networks with caching at base stations"
    - "placing dynamic content in caches with small population"
    - "cooperative local caching under heterogeneous file preferences"
    - "a provably efficient online collaborative caching algorithm for multicell coordinated systems"

Connected through hyperedge HE-6 (induced by source paper "on consideration of content preference and sharing willingness in d2d assisted offloading"):
  with members:
    - "optimizing content caching to maximize the density of successful receptions in device to device networking"
    - "echo state networks for proactive caching in cloud based radio access networks with mobile users"
    - "energy efficient transmission for multicast services in miso distributed antenna systems"
    - "wireless device to device caching networks basic principles and system performance"
    - "caching in the sky proactive deployment of cache enabled unmanned aerial vehicles for optimized quality of experience"
    - "totally distributed energy efficient transmission in mimo interference channels"
    - "cooperative local caching under heterogeneous file preferences"
    - "social data offloading in d2d enhanced cellular networks by network formation games"

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)