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: "robust monotonic optimization framework for multicell miso systems"
  Abstract: The performance of multiuser systems is both difficult to measure fairly and to optimize. Most resource allocation problems are nonconvex and NP-hard, even under simplifying assumptions such as perfect channel knowledge, homogeneous channel properties among users, and simple power constraints. We establish a general optimization framework that systematically solves these problems to global optimality. The proposed branch-reduce-and-bound (BRB) algorithm handles general multicell downlink systems with single-antenna users, multiantenna transmitters, arbitrary quadratic power constraints, and robust- ness to channel uncertainty. A robust fairness-profile optimization (RFO) problem is solved at each iteration, which is a quasiconvex problem and a novel generalization of max-min fairness. The BRB algorithm is computationally costly, but it shows better convergence than the previously proposed outer polyblock approximation algorithm. Our framework is suitable for computing benchmarks in general multicell systems with or without channel uncertainty. We illustrate this by deriving and evaluating a zero-forcing solution to the general problem.

Connected through hyperedge HE-1 (induced by source paper "robust resource allocation for pd noma based miso heterogeneous networks with comp technology"):
  with members:
    - "radio resource allocation for device to device underlay communication using hypergraph theory"
    - "user association in 5g networks a survey and an outlook"
    - "optimal joint power and subcarrier allocation for full duplex multicarrier non orthogonal multiple access systems"
    - "optimal dynamic point selection for power minimization in multiuser downlink comp"
    - "optimal stochastic coordinated beamforming for wireless cooperative networks with csi uncertainty"
    - "low complexity delay constrained beamforming for multi user mimo systems with imperfect csit"
    - "worst case sinr constrained robust coordinated beamforming for multicell wireless systems"
    - "probabilistic sinr constrained robust transmit beamforming a bernstein type inequality based conservative approach"

Connected through hyperedge HE-2 (induced by source paper "mixed monotonic programming for fast global optimization"):
  with members:
    - "optimization of weighted individual energy efficiencies in interference networks"
    - "efficient global optimal resource allocation in non orthogonal interference networks"
    - "energy efficient power control a look at 5g wireless technologies"
    - "resource allocation for energy efficient 3 way relay channels"
    - "achieving global optimality for weighted sum rate maximization in the k user gaussian interference channel with multiple antennas"
    - "framework for link level energy efficiency optimization with informed transmitter"
    - "mapel achieving global optimality for a non convex wireless power control problem"
    - "optimal linear precoding strategies for wideband non cooperative systems based on game theory part ii algorithms"

Connected through hyperedge HE-3 (induced by source paper "age of information aware cache updating with file and age dependent update durations"):
  with members:
    - "scheduling to minimize age of synchronization in wireless broadcast networks with random updates"
    - "age of information for updates with distortion"
    - "scheduling policies for minimizing age of information in broadcast wireless networks"
    - "joint status sampling and updating for minimizing age of information in the internet of things"
    - "when to preempt age of information minimization under link capacity constraint"
    - "scheduling policies for age minimization in wireless networks with unknown channel state"
    - "the age of information real time status updating by multiple sources"

Connected through hyperedge HE-4 (induced by source paper "robust radio resource allocation in miso scma assisted c ran in 5g networks"):
  with members:
    - "a survey on non orthogonal multiple access for 5g networks research challenges and future trends"
    - "iterative receivers for downlink mimo scma message passing and distributed cooperative detection"
    - "a minorization maximization method for optimizing sum rate in the downlink of non orthogonal multiple access systems"
    - "scma for downlink multiple access of 5g wireless networks"
    - "mechanism design for base station association and resource allocation in downlink ofdma network"

Connected through hyperedge HE-5 (induced by source paper "efficient global optimal resource allocation in non orthogonal interference networks"):
  with members:
    - "optimization of weighted individual energy efficiencies in interference networks"
    - "distributed optimization for coordinated beamforming in multicell multigroup multicast systems power minimization and sinr balancing"
    - "energy efficient beam coordination strategies with rate dependent processing power"
    - "energy efficient power control a look at 5g wireless technologies"
    - "optimal achievable rates for interference networks with random codes"
    - "resource allocation for energy efficient 3 way relay channels"
    - "instantaneous relaying for the 3 way relay channel with circular message exchanges"
    - "wireless information and power transfer energy efficiency optimization in ofdma systems"

Connected through hyperedge HE-6 (induced by source paper "energy efficiency maximization for c rans discrete monotonic optimization penalty and ell _ 0 approximation methods"):
  with members:
    - "globally optimal beamforming design for downlink comp transmission with limited backhaul capacity"
    - "elastic net boosting energy efficiency and resource utilization in 5g c rans"
    - "understanding the computational requirements of virtualized baseband units using a programmable cloud radio access network testbed"
    - "recent advances in cloud radio access networks system architectures key techniques and open issues"
    - "energy efficiency of downlink transmission strategies for cloud radio access networks"
    - "fronthaul constrained cloud radio access networks insights and challenges"
    - "backhaul limited asymmetric cooperation for mimo cellular networks via semidefinite relaxation"
    - "sparse beamforming and user centric clustering for downlink cloud radio access network"

Connected through hyperedge HE-7 (induced by source paper "is self interference in full duplex communications a foe or a friend"):
  with members:
    - "energy efficient power control a look at 5g wireless technologies"
    - "wireless powered communication opportunities and challenges"
    - "energy recycling full duplex radios for next generation networks"
    - "on the spectral efficiency of full duplex small cell wireless systems"
    - "full duplex wireless powered relay with self energy recycling"
    - "wireless information and power transfer with full duplex relaying"
    - "fast converging algorithm for weighted sum rate maximization in multicell miso downlink"

Connected through hyperedge HE-8 (induced by source paper "a survey on mimo transmission with discrete input signals technical challenges advances and future trends"):
  with members:
    - "asymptotic performance analysis of a k hop amplify and forward relay mimo channel"
    - "iterative distributed minimum total mse approach for secure communications in mimo interference channels"
    - "asymptotic analysis of su mimo channels with transmitter noise and mismatched joint decoding"
    - "secure massive mimo transmission with an active eavesdropper"
    - "interference aligned space time transmission with diversity for the 2 times 2 x network"
    - "space time encoded miso broadcast channel with outdated csit an error rate and diversity performance analysis"
    - "high snr asymptotics of mutual information for discrete constellations with applications to bicm"
    - "differential distributed space time coding with imperfect synchronization in frequency selective channels"

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)