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: "joint millimeter wave fronthaul and ofdma resource allocation in ultra dense cran"
  Abstract: Ultra-dense (UD) wireless networks and cloud radio access networks (CRAN) are two promising network architectures for the emerging fifth-generation wireless communication systems. By jointly employing them, a new appealing network solution is proposed in this paper, termed UD-CRAN. In a UD-CRAN, millimeter-wave (mmWave) wireless fronthaul is preferred for information exchange between the central processor and the distributed remote radio heads (RRHs), due to its lower cost and higher flexibility in deployment, compared with fixed optical links. This motivates our study in this paper on the downlink transmission in a mmWave fronthaul enabled, orthogonal frequency division multiple access (OFDMA)-based UD-CRAN. In particular, the fronthaul is shared among the RRHs via time division multiple access (TDMA), while the RRHs jointly transmit to the users on orthogonal frequency sub-channels using OFDMA. The joint resource allocation over the TDMA-based mmWave fronthaul and OFDMA-based wireless transmission is investigated to maximize the weighted sum rate of all users. Although the problem is non-convex, we propose a Lagrange duality-based solution, which can be efficiently computed with good accuracy. To further reduce the complexity, we also propose a greedy search-based heuristic, which achieves close to optimal performance under practical setups. Finally, we show the significant throughput gains of the proposed joint resource allocation approach compared with other benchmark schemes by simulations.

Connected through hyperedge HE-1 (induced by source paper "joint beamforming and power splitting design for c ran with multicast fronthaul"):
  with members:
    - "optimized base station cache allocation for cloud radio access network with multicast backhaul"
    - "beamforming design for max min fair swipt in green cloud ran with wireless fronthaul"
    - "energy efficient joint congestion control and resource optimization in heterogeneous cloud radio access networks"
    - "wireless powered communication opportunities and challenges"
    - "collaborative wireless energy and information transfer in interference channel"
    - "outage constrained robust transmit optimization for multiuser miso downlinks tractable approximations by conic optimization"

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"
    - "green ofdma resource allocation in cache enabled 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 "cloud based queuing model for tactile internet in next generation of ran"):
  with members:
    - "resource management and admission control for tactile internet in next generation of ran"
    - "joint uplink and downlink resource configuration for ultra reliable and low latency communications"
    - "network slicing based 5g and future mobile networks mobility resource management and challenges"
    - "power domain non orthogonal multiple access noma in 5g systems potentials and challenges"
    - "realizing the tactile internet haptic communications over next generation 5g cellular networks"
    - "uplink transmission design with massive machine type devices in tactile internet"
    - "fronthauling for 5g lte u ultra dense cloud small cell networks"
    - "resource management in non orthogonal multiple access networks for 5g and beyond"

Connected through hyperedge HE-4 (induced by source paper "resource management and admission control for tactile internet in next generation of ran"):
  with members:
    - "improving network availability of ultra reliable and low latency communications with multi connectivity"
    - "joint uplink and downlink resource configuration for ultra reliable and low latency communications"
    - "network slicing based 5g and future mobile networks mobility resource management and challenges"
    - "realizing the tactile internet haptic communications over next generation 5g cellular networks"
    - "uplink transmission design with massive machine type devices in tactile internet"
    - "fronthauling for 5g lte u ultra dense cloud small cell networks"
    - "joint user association and resource allocation in virtualized wireless networks"
    - "system architecture and key technologies for 5g heterogeneous cloud radio access networks"

Connected through hyperedge HE-5 (induced by source paper "uplink channel estimation and data transmission in millimeter wave cran with lens antenna arrays"):
  with members:
    - "fronthaul limited uplink ofdma in ultra dense cran with hybrid decoding"
    - "multi user millimeter wave mimo with full dimensional lens antenna array"
    - "rf lens embedded massive mimo systems fabrication issues and codebook design"
    - "channel estimation for hybrid architecture based wideband millimeter wave systems"
    - "cost effective millimeter wave communications with lens antenna array"
    - "millimeter wave mimo with lens antenna array a new path division multiplexing paradigm"
    - "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-6 (induced by source paper "beamforming design for max min fair swipt in green cloud ran with wireless fronthaul"):
  with members:
    - "energy throughput tradeoff in sustainable cloud ran with energy harvesting"
    - "greendelivery proactive content caching and push with energy harvesting based small cells"
    - "secure and green swipt in distributed antenna networks with limited backhaul capacity"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "sparse beamforming and user centric clustering for downlink cloud radio access network"
    - "group sparse beamforming for green cloud ran"
    - "coordinated multicast beamforming in multicell networks"

Connected through hyperedge HE-7 (induced by source paper "enhancing cellular performance through device to device distributed mimo"):
  with members:
    - "optimal resource allocation for power efficient mc noma with imperfect channel state information"
    - "energy efficient 5g outdoor to indoor communication sudas over licensed and unlicensed spectrum"
    - "on the minimum decoding delay of balanced complex orthogonal designs"
    - "what will 5g be"
    - "sparse beamforming and user centric clustering for downlink cloud radio access network"
    - "efficiency resource allocation for device to device underlay communication systems a reverse iterative combinatorial auction based approach"
    - "complex orthogonal designs with forbidden 2 times 2 submatrices"

Connected through hyperedge HE-8 (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"
    - "recent advances in cloud radio access networks system architectures key techniques and open issues"
    - "content centric sparse multicast beamforming for cache enabled cloud ran"
    - "green ofdma resource allocation in cache enabled cran"
    - "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"

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)