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: "content centric multicast beamforming in cache enabled cloud radio access networks"
  Abstract: Multicast transmission and wireless caching are effective ways of reducing air and backhaul traffic load in wireless networks. This paper proposes to incorporate these two key ideas for content-centric multicast transmission in a cloud radio access network (RAN) where multiple base stations (BSs) are connected to a central processor (CP) via finite-capacity backhaul links. Each BS has a cache with finite storage size and is equipped with multiple antennas. The BSs cooperatively transmit contents, which are either stored in the local cache or fetched from the CP, to multiple users in the network. Users requesting a same content form a multicast group and are served by a same cluster of BSs cooperatively using multicast beamforming. Assuming fixed cache placement, this paper investigates the joint design of multicast beamforming and content-centric BS clustering by formulating an optimization problem of minimizing the total network cost under the quality-of-service (QoS) constraints for each multicast group. The network cost involves both the transmission power and the backhaul cost. We model the backhaul cost using the mixed $\ell_0/\ell_2$-norm of beamforming vectors. To solve this non-convex problem, we first approximate it using the semidefinite relaxation (SDR) method and concave smooth functions. We then propose a difference of convex functions (DC) programming algorithm to obtain suboptimal solutions and show the connection of three smooth functions. Simulation results validate the advantage of multicasting and show the effects of different cache size and caching policies in cloud RAN.

Connected through hyperedge HE-1 (induced by source paper "caching placement in stochastic wireless caching helper networks channel selection diversity via caching"):
  with members:
    - "on optimal geographical caching in heterogeneous cellular networks"
    - "fundamentals of cluster centric content placement in cache enabled device to device networks"
    - "cooperative caching and transmission design in cluster centric small cell networks"
    - "modeling and performance analysis of clustered device to device networks"
    - "optimal caching placement for d2d assisted wireless caching networks"
    - "analysis on cache enabled wireless heterogeneous networks"
    - "cooperative local caching under heterogeneous file preferences"
    - "optimal geographic caching in cellular networks"

Connected through hyperedge HE-2 (induced by source paper "content centric sparse multicast beamforming for cache enabled cloud ran"):
  with members:
    - "rank two beamforming and power allocation in multicasting relay networks"
    - "cellular broadcast service convergence through caching for comp cloud rans"
    - "on content centric wireless delivery networks"
    - "backhaul limited asymmetric cooperation for mimo cellular networks via semidefinite relaxation"
    - "caching eliminates the wireless bottleneck in video aware wireless networks"
    - "weighted fair multicast multigroup beamforming under per antenna power constraints"
    - "living on the edge the role of proactive caching in 5g wireless networks"
    - "sparse beamforming and user centric clustering for downlink cloud radio access network"

Connected through hyperedge HE-3 (induced by source paper "tradeoff caching strategy of outage probability and fronthaul usage in cloud ran"):
  with members:
    - "joint precoding and rrh selection for user centric green mimo c ran"
    - "cache enabled heterogeneous cellular networks optimal tier level content placement"
    - "content centric sparse multicast beamforming for cache enabled cloud ran"
    - "distributed edge caching scheme considering the tradeoff between the diversity and redundancy of cached content"
    - "redesigning fronthaul for next generation networks beyond baseband samples and point to point links"
    - "backhaul aware caching placement for wireless networks"
    - "base station assisted device to device communications for high throughput wireless video networks"
    - "fundamental limits of caching"

Connected through hyperedge HE-4 (induced by source paper "energy efficiency of downlink transmission strategies for cloud radio access networks"):
  with members:
    - "energy efficient resource assignment and power allocation in heterogeneous cloud radio access networks"
    - "optimized backhaul compression for uplink cloud radio access network"
    - "backhaul limited asymmetric cooperation for mimo cellular networks via semidefinite relaxation"
    - "sparse beamforming and user centric clustering for downlink cloud radio access network"
    - "group sparse beamforming for green cloud ran"
    - "joint precoding and multivariate backhaul compression for the downlink of cloud radio access networks"
    - "uplink multicell processing with limited backhaul via per base station successive interference cancellation"
    - "compute and forward strategies for cooperative distributed antenna systems"

Connected through hyperedge HE-5 (induced by source paper "cooperative hierarchical caching in 5g cloud radio access networks c rans"):
  with members:
    - "fog computing based radio access networks issues and challenges"
    - "content centric sparse multicast beamforming for cache enabled cloud ran"
    - "a provably efficient online collaborative caching algorithm for multicell coordinated systems"
    - "living on the edge the role of proactive caching in 5g wireless networks"
    - "femtocaching wireless video content delivery through distributed caching helpers"

Connected through hyperedge HE-6 (induced by source paper "performance bounds for antenna domain systems"):
  with members:
    - "rrh clustering and transmit precoding for interference limited 5g cran downlink"
    - "fundamental limits of cooperation"
    - "optimality properties distributed strategies and measurement based evaluation of coordinated multicell ofdma transmission"
    - "user partitioning for less overhead in mimo interference channels"

Connected through hyperedge HE-7 (induced by source paper "backhaul traffic balancing and dynamic content centric clustering for the downlink of fog radio access network"):
  with members:
    - "joint optimization of cloud and edge processing for fog radio access networks"
    - "content centric sparse multicast beamforming for cache enabled cloud ran"
    - "cloud radio access networks with coded caching"
    - "fundamental limits of caching"

Connected through hyperedge HE-8 (induced by source paper "robust beamforming in cache enabled cloud radio access networks"):
  with members:
    - "joint hybrid backhaul and access links design in cloud radio access networks"
    - "what will 5g be"
    - "group sparse beamforming for green cloud ran"

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)