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 performance evaluation of a two relay cooperative random access wireless system"
  Abstract: In wireless networks relay nodes can be used to assist the users' transmissions to reach their destination. Work on relay cooperation, from a physical layer perspective, has up to now yielded well-known results. This paper takes a different stance focusing on network-level cooperation. Extending previous results for a single relay, we investigate here the benefits from the deployment of a second one. We assume that the two relays do not generate packets of their own and the system employs random access to the medium; we further consider slotted time and that the users have saturated queues. We obtain analytical expressions for the arrival and service rates of the queues of the two relays and the stability conditions. We investigate a model of the system, in which the users are divided into clusters, each being served by one relay, and show its advantages in terms of aggregate and throughput per user. We quantify the above, analytically for the case of the collision channel and through simulations for the case of Multi-Packet Reception (MPR), and we provide insight on when the deployment of a second relay in the system can yield significant advantages.

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 cooperation in energy harvesting wireless networks"
    - "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 millimeter wave communications"):
  with members:
    - "network level cooperation in random access iot networks with aggregators"
    - "maximum throughput scheduling for multi connectivity in millimeter wave networks"
    - "throughput analysis for relay assisted millimeter wave wireless networks"
    - "beam based stochastic model of the coverage probability in 5g millimeter wave systems"
    - "full duplex millimeter wave communication"
    - "overview of millimeter wave communications for fifth generation 5g wireless networks with a focus on propagation models"
    - "distributed association and relaying with fairness in millimeter wave networks"
    - "on the relay fallback tradeoff in millimeter wave wireless system"

Connected through hyperedge HE-3 (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-4 (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 cooperation in energy harvesting wireless networks"

Connected through hyperedge HE-5 (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-6 (induced by source paper "performance analysis of a cooperative wireless network with adaptive relays a network level study"):
  with members:
    - "random access in c ran for user activity detection with limited capacity fronthaul"
    - "relay assisted multiple access with full duplex multi packet reception"
    - "stability and performance issues of a relay assisted multiple access scheme with mpr capabilities"
    - "a retrial system with two input streams and two orbit queues"

Connected through hyperedge HE-7 (induced by source paper "energy aware cooperative wireless networks with multiple cognitive users"):
  with members:
    - "cognitive radio networks with probabilistic relaying stable throughput and delay tradeoffs"
    - "cognitive radio an information theoretic perspective"

Connected through hyperedge HE-8 (induced by source paper "flow allocation for maximum throughput and bounded delay on multiple disjoint paths for random access wireless multihop networks"):
  with members:
    - "relay assisted multiple access with full duplex multi packet reception"
    - "throughput optimal flow allocation on multiple paths for random access wireless multi hop networks"
    - "on the performance of network coding and forwarding schemes with different degrees of redundancy for wireless mesh networks"
    - "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.NI(Networking and Internet Architecture)