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: "on number of almost blank subframes in heterogeneous cellular networks"
  Abstract: In heterogeneous cellular scenarios with macrocells, femtocells or picocells users may suffer from significant co-channel cross-tier interference. To manage this interference 3GPP introduced almost blank subframe (ABSF), a subframe in which the interferer tier is not allowed to transmit data. Vulnerable users thus get a chance to be scheduled in ABSFs with reduced cross-tier interference. We analyze downlink scenarios using stochastic geometry and formulate a condition for the required number of ABSFs based on base station placement statistics and user throughput requirement. The result is a semi-analytical formula that serves as a good initial estimate and offers an easy way to analyze impact of network parameters. We show that while in macro/femto scenario the residue ABSF interference can be well managed, in macro/pico scenario it affects the number of required ABSFs strongly. The effect of ABSFs is subsequently demonstrated via user throughput simulations. Especially in the macro/pico scenario, we find that using ABSFs is advantageous for the system since victim users no longer suffer from poor performance for the price of relatively small drop in higher throughput percentiles.

Connected through hyperedge HE-1 (induced by source paper "a multi traffic inter cell interference coordination scheme in dense cellular networks"):
  with members:
    - "algorithms for enhanced inter cell interference coordination eicic in lte hetnets"
    - "millimeter wave evolution for 5g cellular networks"
    - "joint resource partitioning and offloading in heterogeneous cellular networks"
    - "enhanced intercell interference coordination challenges in heterogeneous networks"
    - "refim a practical interference management in heterogeneous wireless access networks"

Connected through hyperedge HE-2 (induced by source paper "resource allocation in heterogeneous networks eicic approach"):
  with members:
    - "cooperative interference mitigation algorithm in heterogeneous networks"
    - "enhanced intercell interference coordination challenges in heterogeneous networks"

Connected through hyperedge HE-3 (induced by source paper "cooperative interference mitigation algorithm in heterogeneous networks"):
  with members:
    - "enhanced intercell interference coordination challenges in heterogeneous networks"

Connected through hyperedge HE-4 (induced by source paper "massive mimo meets hetnet interference coordination through spatial blanking"):
  with members:
    - "an overview of load balancing in hetnets old myths and open problems"
    - "on the optimality of treating interference as noise"
    - "downlink mimo hetnets modeling ordering results and performance analysis"
    - "joint resource partitioning and offloading in heterogeneous cellular networks"
    - "joint spatial division and multiplexing for mm wave channels"
    - "downlink multi antenna heterogeneous cellular network with load balancing"
    - "offloading in heterogeneous networks modeling analysis and design insights"
    - "achieving massive mimo spectral efficiency with a not so large number of antennas"

Connected through hyperedge HE-5 (induced by source paper "joint resource partitioning and offloading in heterogeneous cellular networks"):
  with members:
    - "algorithms for enhanced inter cell interference coordination eicic in lte hetnets"
    - "on association cells in random heterogeneous networks"
    - "offloading in heterogeneous networks modeling analysis and design insights"
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"
    - "user association for load balancing in heterogeneous cellular networks"
    - "modeling and analysis of k tier downlink heterogeneous cellular networks"
    - "analytical evaluation of fractional frequency reuse for heterogeneous cellular networks"
    - "enhanced intercell interference coordination challenges in heterogeneous networks"

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)