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: "network level cooperation in energy harvesting wireless networks"
  Abstract: We consider a two-hop communication network consisted of a source node, a relay and a destination node in which the source and the relay node have external traffic arrivals. The relay forwards a fraction of the source node's traffic to the destination and the cooperation is performed at the network level. In addition, both source and relay nodes have energy harvesting capabilities and an unlimited battery to store the harvested energy. We study the impact of the energy constraints on the stability region. Specifically, we provide inner and outer bounds on the stability region of the two-hop network with energy harvesting source and relay.

Connected through hyperedge HE-1 (induced by source paper "performance analysis of a cooperative wireless network with adaptive relays"):
  with members:
    - "network level cooperation in random access iot networks with aggregators"
    - "stable throughput and delay analysis of a random access network with queue aware transmission"
    - "wireless network level partial relay cooperation a stable throughput analysis"
    - "random access in c ran for user activity detection with limited capacity fronthaul"
    - "relay assisted multiple access with full duplex multi packet reception"
    - "analysis of an offloading scheme for data centers in the framework of fog computing"
    - "network level performance evaluation of a two relay cooperative random access wireless system"
    - "a retrial system with two input streams and two orbit queues"

Connected through hyperedge HE-2 (induced by source paper "on the benefits of network level cooperation in iot networks with aggregators"):
  with members:
    - "iot u cellular internet of things networks over unlicensed spectrum"
    - "performance analysis of a cooperative wireless network with adaptive relays"
    - "network level cooperation in random access iot networks with aggregators"
    - "performance analysis of uplink cellular iot using different deployments of data aggregators"
    - "on the benefits of network level cooperation in millimeter wave communications"
    - "aggregation and resource scheduling in machine type communication networks a stochastic geometry approach"
    - "wireless network level partial relay cooperation a stable throughput analysis"
    - "massive machine type communication with data aggregation and resource scheduling"

Connected through hyperedge HE-3 (induced by source paper "network level cooperation in random access iot networks with aggregators"):
  with members:
    - "stable throughput and delay analysis of a random access network with queue aware transmission"
    - "aggregation and resource scheduling in machine type communication networks a stochastic geometry approach"
    - "wireless network level partial relay cooperation a stable throughput analysis"
    - "allocation of heterogeneous resources of an iot device to flexible services"
    - "massive machine type communication with data aggregation and resource scheduling"
    - "effect of energy harvesting on stable throughput in cooperative relay systems"
    - "optimizing data aggregation for uplink machine to machine communication networks"
    - "network level performance evaluation of a two relay cooperative random access wireless system"

Connected through hyperedge HE-4 (induced by source paper "wireless network level partial relay cooperation a stable throughput analysis"):
  with members:
    - "relay selection in cooperative power line communication a multi armed bandit approach"
    - "wireless energy harvesting in a cognitive relay network"
    - "energy aware wireless relay selection in load coupled ofdma cellular networks"
    - "probabilistic cooperation of a full duplex relay in random access networks"
    - "on the stability of random multiple access with stochastic energy harvesting"
    - "effect of energy harvesting on stable throughput in cooperative relay systems"
    - "relay assisted multiple access with full duplex multi packet reception"
    - "5g cellular key enabling technologies and research challenges"

Connected through hyperedge HE-5 (induced by source paper "relay assisted multiple access with full duplex multi packet reception"):
  with members:
    - "effect of energy harvesting on stable throughput in cooperative relay systems"
    - "stability and performance issues of a relay assisted multiple access scheme with mpr capabilities"
    - "on the stability region of a relay assisted multiple access scheme"
    - "half duplex or full duplex relaying a capacity analysis under self interference"
    - "relay assisted multiple access with multi packet reception capability and simultaneous transmission and reception"
    - "cellular systems with full duplex compress and forward relaying and cooperative base stations"

Connected through hyperedge HE-6 (induced by source paper "effect of energy harvesting on stable throughput in cooperative relay systems"):
  with members:
    - "on the stability of random multiple access with stochastic energy harvesting"
    - "optimal utilization of a cognitive shared channel with a rechargeable primary source node"

Connected through hyperedge HE-7 (induced by source paper "network level performance evaluation of a two relay cooperative random access wireless system"):
  with members:
    - "polynomial complexity minimum time scheduling in a class of wireless networks"
    - "relay assisted multiple access with full duplex multi packet reception"
    - "stability and performance issues of a relay assisted multiple access scheme with mpr capabilities"
    - "on the stability region of a relay assisted multiple access scheme"
    - "relay assisted multiple access with multi packet reception capability and simultaneous transmission and reception"

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)