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: "a utility proportional fairness resource allocation in spectrally radar coexistent cellular networks"
  Abstract: Spectrum sharing is an elegant solution to addressing the scarcity of the bandwidth for wireless communications systems. This research studies the feasibility of sharing the spectrum between sectorized cellular systems and stationary radars interfering with certain sectors of the communications infrastructure. It also explores allocating optimal resources to mobile devices in order to provide with the quality of service for all running applications whilst growing the communications network spectrally coexistent with the radar systems. The rate allocation problem is formulated as two convex optimizations, where the radar-interfering sector assignments are extracted from the portion of the spectrum non-overlapping with the radar operating frequency. Such a double-stage resource allocation procedure inherits the fairness into the rate allocation scheme by first assigning the spectrally radar-overlapping resources.

Connected through hyperedge HE-1 (induced by source paper "position estimation of robotic mobile nodes in wireless testbed using geni"):
  with members:
    - "an online delay efficient multi class packet scheduler for heterogeneous m2m uplink traffic"
    - "an online delay efficient packet scheduler for m2m traffic in industrial automation"
    - "a qos based power allocation for cellular users with different modulations"
    - "optimal downlink power allocation in cellular networks"
    - "a price selective centralized algorithm for resource allocation with carrier aggregation in lte cellular networks"
    - "an efficient multi carrier resource allocation with user discrimination framework for 5g wireless systems"
    - "application aware resource block and power allocation for lte"
    - "an optimal application aware resource block scheduling in lte"

Connected through hyperedge HE-2 (induced by source paper "coexistence analysis between radar and cellular system in los channel"):
  with members:
    - "separation of signals consisting of amplitude and instantaneous frequency rrc pulses using snr uniform training"
    - "qpsk waveform for mimo radar with spectrum sharing constraints"
    - "target detection performance of spectrum sharing mimo radars"
    - "overlapped mimo radar waveform design for coexistence with communication systems"
    - "radar precoder design for spectral coexistence with coordinated multi point comp system"
    - "on the impact of time varying interference channel on the spatial approach of spectrum sharing between s band radar and communication system"

Connected through hyperedge HE-3 (induced by source paper "an optimal resource allocation with frequency reuse in cellular networks"):
  with members:
    - "signal processing and optimal resource allocation for the interference channel"
    - "multi application resource allocation with users discrimination in cellular networks"

Connected through hyperedge HE-4 (induced by source paper "3d channel modeling between seaborne mimo radar and mimo cellular system"):
  with members:
    - "coexistence analysis between radar and cellular system in los channel"
    - "qpsk waveform for mimo radar with spectrum sharing constraints"
    - "target detection performance of spectrum sharing mimo radars"
    - "overlapped mimo radar waveform design for coexistence with communication systems"
    - "on the impact of time varying interference channel on the spatial approach of spectrum sharing between s band radar and communication system"
    - "preliminary results on 3d channel modeling from theory to standardization"

Connected through hyperedge HE-5 (induced by source paper "target detection performance of spectrum sharing mimo radars"):
  with members:
    - "coexistence analysis between radar and cellular system in los channel"
    - "qpsk waveform for mimo radar with spectrum sharing constraints"
    - "3d channel modeling between seaborne mimo radar and mimo cellular system"
    - "overlapped mimo radar waveform design for coexistence with communication systems"
    - "radar precoder design for spectral coexistence with coordinated multi point comp system"
    - "on the impact of time varying interference channel on the spatial approach of spectrum sharing between s band radar and communication system"

Connected through hyperedge HE-6 (induced by source paper "three dimensional 3d channel modeling between seaborne mimo radar and mimo cellular system"):
  with members:
    - "qpsk waveform for mimo radar with spectrum sharing constraints"
    - "target detection performance of spectrum sharing mimo radars"
    - "overlapped mimo radar waveform design for coexistence with communication systems"
    - "on the impact of time varying interference channel on the spatial approach of spectrum sharing between s band radar and communication system"
    - "preliminary results on 3d channel modeling from theory to standardization"

Connected through hyperedge HE-7 (induced by source paper "qpsk waveform for mimo radar with spectrum sharing constraints"):
  with members:
    - "coexistence analysis between radar and cellular system in los channel"
    - "3d channel modeling between seaborne mimo radar and mimo cellular system"
    - "target detection performance of spectrum sharing mimo radars"
    - "on the impact of time varying interference channel on the spatial approach of spectrum sharing between s band radar and communication system"

Connected through hyperedge HE-8 (induced by source paper "radar precoder design for spectral coexistence with coordinated multi point comp system"):
  with members:
    - "qpsk waveform for mimo radar with spectrum sharing constraints"
    - "target detection performance of spectrum sharing mimo radars"
    - "on the impact of time varying interference channel on the spatial approach of spectrum sharing between s band radar and communication system"

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.NI(Networking and Internet Architecture)