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: "power and channel allocation for non orthogonal multiple access in 5g systems tractability and computation"
  Abstract: A promising multi-user access scheme, non-orthogonal multiple access (NOMA) with successive interference cancellation (SIC), is currently under consideration for 5G systems. NOMA allows more than one user to simultaneously access the same frequency-time resource and separates multi-user signals by SIC. These render resource optimization in NOMA different from orthogonal multiple access. We provide theoretical insights and algorithmic solutions to jointly optimize power and channel allocation in NOMA. We mathematically formulate NOMA resource allocation problems, and characterize and analyze the problems’ tractability under a range of constraints and utility functions. For tractable cases, we provide polynomial-time solutions for global optimality. For intractable cases, we prove the NP-hardness and propose an algorithmic framework combining Lagrangian duality and dynamic programming to deliver near-optimal solutions. To gauge the performance of the solutions, we also provide optimality bounds on the global optimum. Numerical results demonstrate that the proposed algorithmic solution can significantly improve the system performance in both throughput and fairness over orthogonal multiple access as well as over a previous NOMA resource allocation scheme.

Connected through hyperedge HE-1 (induced by source paper "non orthogonal multiple access noma how it meets 5g and beyond"):
  with members:
    - "securing downlink massive mimo noma networks with artificial noise"
    - "energy efficient joint user rb association and power allocation for uplink hybrid noma oma"
    - "capacity and outage analysis of a dual hop decode and forward relay aided noma scheme"
    - "energy efficient power allocation in uplink mmwave massive mimo with noma"
    - "optimal joint subcarrier and power allocation in noma is strongly np hard"
    - "power domain non orthogonal multiple access noma in 5g systems potentials and challenges"
    - "non orthogonal multiple access in large scale heterogeneous networks"
    - "a two phase power allocation scheme for crns employing noma"

Connected through hyperedge HE-2 (induced by source paper "a note on decoding order in optimizing multi cell noma"):
  with members:
    - "a robust machine learning method for cell load approximation in wireless networks"
    - "a framework for optimizing multi cell noma delivering demand with less resource"
    - "resource optimization with load coupling in multi cell noma"
    - "on optimal power allocation for downlink non orthogonal multiple access systems"
    - "energy aware wireless relay selection in load coupled ofdma cellular networks"
    - "load optimization with user association in cooperative and load coupled lte networks"
    - "dynamic user clustering and power allocation for uplink and downlink non orthogonal multiple access noma systems"
    - "elementary properties of positive concave mappings with applications to network planning and optimization"

Connected through hyperedge HE-3 (induced by source paper "performance analysis of ssk noma"):
  with members:
    - "derivation of the closed form ber expressions for dl noma over nakagami m fading channels"
    - "spatial modulation assisted multi antenna non orthogonal multiple access"
    - "power domain non orthogonal multiple access noma in 5g systems potentials and challenges"
    - "a fair power allocation approach to noma in multiuser siso systems"
    - "resource allocation for downlink noma systems key techniques and open issues"
    - "relay selection for cooperative noma"
    - "non orthogonal multiple access in multi cell networks theory performance and practical challenges"
    - "fairness for non orthogonal multiple access in 5g systems"

Connected through hyperedge HE-4 (induced by source paper "distributed cluster formation and power bandwidth allocation for imperfect noma in dl hetnets"):
  with members:
    - "optimal resource allocation for power efficient mc noma with imperfect channel state information"
    - "on optimal power allocation for downlink non orthogonal multiple access systems"
    - "joint rate control and power allocation for non orthogonal multiple access systems"
    - "sub channel assignment power allocation and user scheduling for non orthogonal multiple access networks"
    - "optimal joint power and subcarrier allocation for full duplex multicarrier non orthogonal multiple access systems"
    - "dynamic user clustering and power allocation for uplink and downlink non orthogonal multiple access noma systems"
    - "non orthogonal multiple access noma for downlink multiuser mimo systems user clustering beamforming and power allocation"

Connected through hyperedge HE-5 (induced by source paper "distributed user clustering and resource allocation for imperfect noma in heterogeneous networks"):
  with members:
    - "distributed cluster formation and power bandwidth allocation for imperfect noma in dl hetnets"
    - "optimal resource allocation for power efficient mc noma with imperfect channel state information"
    - "dynamic user clustering and power allocation for uplink and downlink non orthogonal multiple access noma systems"
    - "non orthogonal multiple access noma for downlink multiuser mimo systems user clustering beamforming and power allocation"
    - "why to decouple the uplink and downlink in cellular networks and how to do it"

Connected through hyperedge HE-6 (induced by source paper "weighted sum rate maximization in multi carrier noma with cellular power constraint"):
  with members:
    - "optimal joint subcarrier and power allocation in noma is strongly np hard"
    - "optimal joint power and subcarrier allocation for mc noma systems"
    - "a new noma approach for fair power allocation"
    - "complexity analysis of joint subcarrier and power allocation for the cellular downlink ofdma system"
    - "on the complexity of joint subcarrier and power allocation for multi user ofdma systems"

Connected through hyperedge HE-7 (induced by source paper "a novel channel reservation mechanism for next generation cellular networks"):
  with members:
    - "deep reinforcement learning for resource allocation in v2v communications"
    - "towards the 5th generation of wireless communication systems"
    - "proactive resource management in lte u systems a deep learning perspective"

Connected through hyperedge HE-8 (induced by source paper "intelligent scheduling and power control for multimedia transmission in 5g comp systems a dynamic bargaining game"):
  with members:
    - "towards 1 gbps ue in cellular systems understanding ultra dense small cell deployments"
    - "fundamental limits of cooperation"

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)