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: "hierarchical radio resource optimization for heterogeneous networks with enhanced inter cell interference coordination eicic"
  Abstract: Interference is a major performance bottleneck in Heterogeneous Network (HetNet) due to its multi-tier structure. We propose almost blank resource block (ABRB) for interference control in HetNet. When an ABRB is scheduled in a macro BS, a resource block (RB) with blank payload is transmitted and this eliminates the interference from this macro BS to the pico BSs. We study a two timescale hierarchical radio resource management (RRM) scheme for HetNet with dynamic ABRB control. The long term controls, such as dynamic ABRB, are adaptive to the large scale fading at a RRM server for co-Tier and cross-Tier interference control. The short term control (user scheduling) is adaptive to the local channel state information at each BS to exploit the multi-user diversity. The two timescale optimization problem is challenging due to the exponentially large solution space. We exploit the sparsity in the interference graph of the HetNet topology and derive structural properties for the optimal ABRB control. Based on that, we propose a two timescale alternative optimization solution for user scheduling and ABRB control. The solution has low complexity and is asymptotically optimal at high SNR. Simulations show that the proposed solution has significant gain over various baselines.

Connected through hyperedge HE-1 (induced by source paper "optimal hierarchical radio resource management for hetnets with flexible backhaul"):
  with members:
    - "programming flows in dense mobile environments a multi user diversity perspective"
    - "algorithms for enhanced inter cell interference coordination eicic in lte hetnets"

Connected through hyperedge HE-2 (induced by source paper "separation framework an enabler for cooperative and d2d communication for future 5g networks"):
  with members:
    - "d2d enhanced heterogeneous cellular networks with dynamic tdd"
    - "algorithms for enhanced inter cell interference coordination eicic in lte hetnets"
    - "software defined networking a comprehensive survey"
    - "a survey on device to device communication in cellular networks"
    - "what will 5g be"
    - "cache enabled opportunistic cooperative mimo for video streaming in wireless systems"
    - "millimeter wave cellular wireless networks potentials and challenges"
    - "mixed timescale precoding and cache control in cached mimo interference network"

Connected through hyperedge HE-3 (induced by source paper "user association and interference management in massive mimo hetnets"):
  with members:
    - "performance analysis of massive mimo for cell boundary users"
    - "harmonized cellular and distributed massive mimo load balancing and scheduling"
    - "algorithms for enhanced inter cell interference coordination eicic in lte hetnets"
    - "an overview of load balancing in hetnets old myths and open problems"
    - "optimal user cell association for massive mimo wireless networks"
    - "massive mimo for next generation wireless systems"
    - "what will 5g be"
    - "evolution toward 5g multi tier cellular wireless networks an interference management perspective"

Connected through hyperedge HE-4 (induced by source paper "licensed and unlicensed spectrum allocation in heterogeneous networks"):
  with members:
    - "scalable spectrum allocation and user association in networks with many small cells"
    - "hybrid spectrum sharing in mmwave cellular networks"
    - "the impact of unlicensed access on small cell resource allocation"
    - "energy management in heterogeneous networks with cell activation user association and interference coordination"
    - "dual timescale spectrum management in wireless heterogeneous networks"
    - "cell free massive mimo versus small cells"
    - "energy efficient cell activation user association and spectrum allocation in heterogeneous networks"
    - "small cell traffic balancing over licensed and unlicensed bands"

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)