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: "effect of retransmissions on optimal caching in cache enabled small cell networks"
  Abstract: Caching popular content in the storage of small cells is being considered as an efficient technique to complement limited backhaul of small cells in ultra-dense heterogeneous cellular networks. Limited storage capacity of the small cells renders it important to determine the optimal set of files (cache) to be placed on each small cell. In contrast to prior works on optimal caching, in this work we study the effect of retransmissions on the optimal cache placement policy for both static and mobile user scenarios. With the popularity of files modeled as a Zipf distribution and a maximum n transmissions, i.e., n-1 retransmissions, allowed to receive each file, we determine the optimal caching probability of the files that maximizes the hit probability. Our closed-form optimal solutions concretely demonstrate that the optimal caching probabilities are very sensitive to the number of retransmissions.

Connected through hyperedge HE-1 (induced by source paper "stochastic design and analysis of wireless cloud caching networks"):
  with members:
    - "3gpp inspired hetnet model using poisson cluster process sum product functionals and downlink coverage"
    - "random caching based cooperative transmission in heterogeneous wireless networks"
    - "stochastic geometry modeling and analysis of single and multi cluster wireless networks"
    - "fundamentals of cluster centric content placement in cache enabled device to device networks"
    - "optimizing content caching to maximize the density of successful receptions in device to device networking"
    - "poisson cluster process based analysis of hetnets with correlated user and base station locations"
    - "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-2 (induced by source paper "energy efficient cooperative caching in uav networks"):
  with members:
    - "energy minimization for wireless communication with rotary wing uav"
    - "random caching based cooperative transmission in heterogeneous wireless networks"
    - "joint trajectory and communication design for multi uav enabled wireless networks"
    - "power control in uav supported ultra dense networks communications caching and energy transfer"
    - "modeling and analysis of cellular networks using stochastic geometry a tutorial"
    - "overcoming endurance issue uav enabled communications with proactive caching"
    - "mitigating interference in content delivery networks by spatial signal alignment the approach of shot noise ratio"
    - "optimization and analysis of probabilistic caching in n tier heterogeneous networks"

Connected through hyperedge HE-3 (induced by source paper "caching or no caching in dense hetnets"):
  with members:
    - "modeling and analysis of cellular networks using stochastic geometry a tutorial"
    - "optimization and analysis of probabilistic caching in n tier heterogeneous networks"
    - "cache enabled heterogeneous cellular networks optimal tier level content placement"
    - "optimal geographic caching in cellular networks"
    - "downlink cellular network analysis with multi slope path loss models"
    - "what will 5g be"
    - "five disruptive technology directions for 5g"
    - "modeling and analysis of k tier downlink heterogeneous cellular networks"

Connected through hyperedge HE-4 (induced by source paper "exploiting moving intelligence delay optimized computation offloading in vehicular fog networks"):
  with members:
    - "learning based task offloading for vehicular cloud computing systems"
    - "coding for distributed fog computing"
    - "a survey on mobile edge computing the communication perspective"
    - "towards low latency and ultra reliable vehicle to vehicle communication"
    - "task replication for deadline constrained vehicular cloud computing optimal policy performance analysis and implications on road traffic"
    - "effect of user mobility on the performance of device to device networks with distributed caching"

Connected through hyperedge HE-5 (induced by source paper "enhancing performance of random caching in large scale heterogeneous wireless networks with random discontinuous transmission"):
  with members:
    - "enhancing performance of random caching in large scale wireless networks with multiple receive antennas"
    - "random caching based cooperative transmission in heterogeneous wireless networks"
    - "spatio temporal interference correlation and joint coverage in cellular networks"
    - "caching at the wireless edge design aspects challenges and future directions"
    - "optimal content placement for offloading in cache enabled heterogeneous wireless networks"
    - "wireless caching technical misconceptions and business barriers"
    - "a learning based approach to caching in heterogenous small cell networks"
    - "cache enabled heterogeneous cellular networks comparison and tradeoffs"

Connected through hyperedge HE-6 (induced by source paper "on the interplay between edge caching and harq in fog ran"):
  with members:
    - "fog aided wireless networks for content delivery fundamental latency tradeoffs"
    - "degrees of freedom of cache aided wireless interference networks"
    - "fog computing based radio access networks issues and challenges"
    - "joint optimization of cloud and edge processing for fog radio access networks"
    - "cloud and cache aided wireless networks fundamental latency trade offs"
    - "placing dynamic content in caches with small population"
    - "content centric sparse multicast beamforming for cache enabled cloud ran"
    - "wireless communications in the era of big data"

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)