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: "optimal caching placement for d2d assisted wireless caching networks"
  Abstract: In this paper, we devise the optimal caching placement to maximize the offloading probability for a two-tier wireless caching system, where the helpers and a part of users have caching ability. The offloading comes from the local caching, D2D sharing and the helper transmission. In particular, to maximize the offloading probability we reformulate the caching placement problem for users and helpers into a difference of convex (DC) problem which can be effectively solved by DC programming. Moreover, we analyze the two extreme cases where there is only help-tier caching network and only user-tier. Specifically, the placement problem for the helper-tier caching network is reduced to a convex problem, and can be effectively solved by the classical water-filling method. We notice that users and helpers prefer to cache popular contents under low node density and prefer to cache different contents evenly under high node density. Simulation results indicate a great performance gain of the proposed caching placement over existing approaches.

Connected through hyperedge HE-1 (induced by source paper "cacheable and non cacheable traffic interplay in a relay assisted wireless network"):
  with members:
    - "learning to cache with no regrets"
    - "wireless caching technical misconceptions and business barriers"
    - "energy efficiency of downlink networks with caching at base stations"

Connected through hyperedge HE-2 (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"
    - "cache enabled device to device communications offloading gain and energy cost"
    - "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"

Connected through hyperedge HE-3 (induced by source paper "caching at base stations with heterogeneous user demands and spatial locality"):
  with members:
    - "when exploiting individual user preference is beneficial for caching at base stations"
    - "optimal cache leasing from a mobile network operator to a content provider"
    - "3gpp inspired hetnet model using poisson cluster process sum product functionals and downlink coverage"
    - "caching policy optimization for d2d communications by learning user preference"
    - "modeling analysis and optimization of coded caching in small cell networks"
    - "understanding performance of edge content caching for mobile video streaming"
    - "wireless caching technical misconceptions and business barriers"
    - "big data caching for networking moving from cloud to edge"

Connected through hyperedge HE-4 (induced by source paper "content placement in cache networks using graph coloring"):
  with members:
    - "mobility aware caching for content centric wireless networks modeling and methodology"
    - "optimal storage allocation for wireless cloud caching systems with a limited sum storage capacity"
    - "wireless content caching for small cell and d2d networks"
    - "caching placement in stochastic wireless caching helper networks channel selection diversity via caching"
    - "cache enabled heterogeneous cellular networks optimal tier level content placement"
    - "cooperative local caching under heterogeneous file preferences"
    - "cache enabled opportunistic cooperative mimo for video streaming in wireless systems"
    - "base station assisted device to device communications for high throughput wireless video networks"

Connected through hyperedge HE-5 (induced by source paper "cost optimal caching for d2d networks with user mobility modeling analysis and computational approaches"):
  with members:
    - "incentive mechanism design for cache assisted d2d communications a mobility aware approach"
    - "mobility increases the data offloading ratio in d2d caching networks"
    - "stochastic content centric multicast scheduling for cache enabled heterogeneous cellular networks"
    - "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"
    - "fog computing based radio access networks issues and challenges"
    - "mobility aware caching for content centric wireless networks modeling and methodology"
    - "mobility aware caching in d2d networks"

Connected through hyperedge HE-6 (induced by source paper "caching policy toward maximal success probability and area spectral efficiency of cache enabled hetnets"):
  with members:
    - "caching at the wireless edge design aspects challenges and future directions"
    - "optimal content placement for offloading in cache enabled heterogeneous wireless networks"
    - "edge caching for coverage and capacity aided heterogeneous networks"
    - "cache enabled heterogeneous cellular networks comparison and tradeoffs"
    - "energy efficiency of downlink networks with caching at base stations"
    - "analysis on cache enabled wireless heterogeneous networks"
    - "optimal geographic caching in cellular networks"
    - "analysis and optimization of caching and multicasting in large scale cache enabled wireless networks"

Connected through hyperedge HE-7 (induced by source paper "high throughput opportunistic cooperative device to device communications with caching"):
  with members:
    - "wireless device to device caching networks basic principles and system performance"
    - "energy efficiency of downlink networks with caching at base stations"
    - "optimal geographic caching in cellular networks"
    - "a survey on device to device communication in cellular networks"
    - "living on the edge the role of proactive caching in 5g wireless networks"
    - "mixed timescale precoding and cache control in cached mimo interference network"
    - "base station assisted device to device communications for high throughput wireless video networks"
    - "exploring social ties for enhanced device to device communications in wireless networks"

Connected through hyperedge HE-8 (induced by source paper "coded caching clusters with device to device communications"):
  with members:
    - "mobility increases the data offloading ratio in d2d caching networks"
    - "on consideration of content preference and sharing willingness in d2d assisted offloading"
    - "spatially correlated content caching for device to device communications"
    - "fundamentals of cluster centric content placement in cache enabled device to device networks"
    - "optimal geographic caching in finite wireless networks"
    - "wireless device to device caching networks basic principles and system performance"
    - "wireless content caching for small cell and d2d networks"
    - "energy costs for traffic offloading by cache enabled d2d communications"

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)