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: "green ofdma resource allocation in cache enabled cran"
  Abstract: Cloud radio access network (CRAN), in which remote radio heads (RRHs) are deployed to serve users in a target area, and connected to a central processor (CP) via limited-capacity links termed the fronthaul, is a promising candidate for the next-generation wireless communication systems. Due to the content-centric nature of future wireless communications, it is desirable to cache popular contents beforehand at the RRHs, to reduce the burden on the fronthaul and achieve energy saving through cooperative transmission. This motivates our study in this paper on the energy efficient transmission in an orthogonal frequency division multiple access (OFDMA)-based CRAN with multiple RRHs and users, where the RRHs can prefetch popular contents. We consider a joint optimization of the user-SC assignment, RRH selection and transmit power allocation over all the SCs to minimize the total transmit power of the RRHs, subject to the RRHs' individual fronthaul capacity constraints and the users' minimum rate constraints, while taking into account the caching status at the RRHs. Although the problem is non-convex, we propose a Lagrange duality based solution, which can be efficiently computed with good accuracy. We compare the minimum transmit power required by the proposed algorithm with different caching strategies against the case without caching by simulations, which show the significant energy saving with caching.

Connected through hyperedge HE-1 (induced by source paper "cooperative multi bitrate video caching and transcoding in multicarrier noma assisted heterogeneous virtualized mec networks"):
  with members:
    - "latency optimization for resource allocation in mobile edge computation offloading"
    - "fairness and transmission aware caching and delivery policies in ofdma based hetnets"
    - "noma assisted wireless caching strategies and performance analysis"
    - "dynamic computation offloading for mobile edge computing with energy harvesting devices"
    - "optimal joint power and subcarrier allocation for mc noma systems"
    - "energy efficient resource allocation for mobile edge computation offloading"
    - "collaborative mobile edge computing in 5g networks new paradigms scenarios and challenges"
    - "optimal joint power and subcarrier allocation for full duplex multicarrier non orthogonal multiple access systems"

Connected through hyperedge HE-2 (induced by source paper "joint uplink and downlink transmissions in user centric ofdma cloud ran"):
  with members:
    - "joint precoding and rrh selection for user centric green mimo c ran"
    - "fronthaul limited uplink ofdma in ultra dense cran with hybrid decoding"
    - "joint millimeter wave fronthaul and ofdma resource allocation in ultra dense cran"
    - "why to decouple the uplink and downlink in cellular networks and how to do it"
    - "fronthaul constrained cloud radio access networks insights and challenges"
    - "coordinated scheduling for the downlink of cloud radio access networks"
    - "what will 5g be"
    - "sparse beamforming and user centric clustering for downlink cloud radio access network"

Connected through hyperedge HE-3 (induced by source paper "cache placement in two tier hetnets with limited storage capacity cache or buffer"):
  with members:
    - "optimal fairness aware time and power allocation in wireless powered communication networks"
    - "energy efficient resource allocation in machine to machine communications with multiple access and energy harvesting for iot"
    - "cooperative edge caching in user centric clustered mobile networks"
    - "association and load optimization with user priorities in load coupled heterogeneous networks"
    - "on consideration of content preference and sharing willingness in d2d assisted offloading"
    - "stochastic content centric multicast scheduling for cache enabled heterogeneous cellular networks"
    - "caching at the wireless edge design aspects challenges and future directions"
    - "wireless caching technical misconceptions and business barriers"

Connected through hyperedge HE-4 (induced by source paper "single or multiple frames content delivery for robust and secure communication in energy and spectrum efficient 5g networks"):
  with members:
    - "cost effective cache deployment in mobile heterogeneous networks"
    - "fairness and transmission aware caching and delivery policies in ofdma based hetnets"
    - "a new look at physical layer security caching and wireless energy harvesting for heterogeneous ultra dense networks"
    - "limited feedback scheme for device to device communications in 5g cellular networks with reliability and cellular secrecy outage constraints"
    - "joint backhaul access analysis of full duplex self backhauling heterogeneous networks"
    - "joint hybrid backhaul and access links design in cloud radio access networks"
    - "exploiting device to device communications in joint scheduling of access and backhaul for mmwave small cells"
    - "uplink contention based scma for 5g radio access"

Connected through hyperedge HE-5 (induced by source paper "r fft function split at ifft fft in unified lte cran and cable access network"):
  with members:
    - "on the fronthaul statistical multiplexing gain"
    - "recent advances in cloud radio access networks system architectures key techniques and open issues"
    - "cluster content caching an energy efficient approach to improve quality of service in cloud radio access networks"
    - "statistical multiplexing gain analysis of heterogeneous virtual base station pools in cloud radio access networks"
    - "software defined optical networks sdons a comprehensive survey"
    - "upstream polling protocols for flow control in pon xdsl hybrid access networks"
    - "optimized configurable architectures for scalable soft input soft output mimo detectors with 256 qam"
    - "quantized massive mu mimo ofdm uplink"

Connected through hyperedge HE-6 (induced by source paper "fronthaul limited uplink ofdma in ultra dense cran with hybrid decoding"):
  with members:
    - "cross layer design for downlink multihop cloud radio access networks with network coding"
    - "joint millimeter wave fronthaul and ofdma resource allocation in ultra dense cran"
    - "recent advances in cloud radio access networks system architectures key techniques and open issues"
    - "content centric sparse multicast beamforming for cache enabled cloud ran"
    - "wireless communications in the era of big data"
    - "large scale convex optimization for ultra dense cloud ran"
    - "optimized uplink transmission in multi antenna c ran with spatial compression and forward"
    - "optimized backhaul compression for uplink cloud radio access network"

Connected through hyperedge HE-7 (induced by source paper "user centric performance optimization with remote radio head cooperation in c ran"):
  with members:
    - "joint precoding and rrh selection for user centric green mimo c ran"
    - "load balancing via joint transmission in heterogeneous lte modeling and computation"
    - "joint comp cell selection and resource allocation with fronthaul constrained c ran"
    - "load optimization with user association in cooperative and load coupled lte networks"
    - "dynamic joint uplink and downlink optimization for uplink and downlink decoupling enabled 5g heterogeneous networks"
    - "cooperative interference mitigation and handover management for heterogeneous cloud small cell networks"
    - "system architecture and key technologies for 5g heterogeneous cloud radio access networks"
    - "analysis of cell load coupling for lte network planning and optimization"

Connected through hyperedge HE-8 (induced by source paper "fairness and transmission aware caching and delivery policies in ofdma based hetnets"):
  with members:
    - "wireless device to device caching networks basic principles and system performance"
    - "backhaul aware caching placement for wireless networks"
    - "living on the edge the role of proactive caching in 5g wireless networks"
    - "the throughput outage tradeoff of wireless one hop caching networks"
    - "femtocaching wireless video content delivery through distributed caching helpers"
    - "a quantitative measure of fairness and discrimination for resource allocation in shared computer systems"

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)