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: "multi round contention in wireless lans with multipacket reception"
  Abstract: Multi-packet reception (MPR) has been recognized as a powerful capacity-enhancement technique for randomaccess wireless local area networks (WLANs). As is common with all random access protocols, the wireless channel is often under-utilized in MPR WLANs. In this paper, we propose a novel multi-round contention random-access protocol to address this problem. This work complements the existing randomaccess methods that are based on single-round contention. In the proposed scheme, stations are given multiple chances to contend for the channel until there are a sufficient number of ?winning? stations that can share the MPR channel for data packet transmission. The key issue here is the identification of the optimal time to stop the contention process and start data transmission. The solution corresponds to finding a desired tradeoff between channel utilization and contention overhead. In this paper, we conduct a rigorous analysis to characterize the optimal strategy using the theory of optimal stopping. An interesting result is that the optimal stopping strategy is a simple threshold-based rule, which stops the contention process as soon as the total number of winning stations exceeds a certain threshold. Compared with the conventional single-round contention protocol, the multi-round contention scheme significantly enhances channel utilization when the MPR capability of the channel is small to medium. Meanwhile, the scheme automatically falls back to single-round contention when the MPR capability is very large, in which case the throughput penalty due to random access is already small even with single-round contention.

Connected through hyperedge HE-1 (induced by source paper "an optimal stopping approach to cell selection in 5g networks"):
  with members:
    - "random access preamble design and detection for 3gpp narrowband iot systems"
    - "distributed opportunistic scheduling for energy harvesting based wireless networks a two stage probing approach"
    - "throughput optimal listen before talk for cellular in unlicensed spectrum"
    - "an overview of load balancing in hetnets old myths and open problems"
    - "what will 5g be"
    - "dynamic resource allocation for multiple antenna wireless power transfer"

Connected through hyperedge HE-2 (induced by source paper "survey and performance evaluation of the upcoming next generation wlan standard ieee 802 11ax"):
  with members:
    - "ieee 802 11ax high efficiency wlans"
    - "mu mimo mac protocols for wireless local area networks a survey"
    - "leader contention based user matching for 802 11 multiuser mimo networks"
    - "uplink contention based scma for 5g radio access"

Connected through hyperedge HE-3 (induced by source paper "mu mimo mac protocols for wireless local area networks a survey"):
  with members:
    - "uni mumac a unified down up link mu mimo mac protocol for ieee 802 11ac wlans"
    - "leader contention based user matching for 802 11 multiuser mimo networks"
    - "proportional fair mu mimo in 802 11 wlans"
    - "massive mimo for next generation wireless systems"
    - "evolution toward 5g multi tier cellular wireless networks an interference management perspective"
    - "design and characterization of a full duplex multiantenna system for wifi networks"
    - "managing heterogeneous wsns in smart cities challenges and requirements"
    - "on the performance of packet aggregation in ieee 802 11ac mu mimo wlans"

Connected through hyperedge HE-4 (induced by source paper "optimal aloha like random access with heterogeneous qos guarantees for multi packet reception aided visible light communications"):
  with members:
    - "fifty years of mimo detection the road to large scale mimos"

Connected through hyperedge HE-5 (induced by source paper "uni mumac a unified down up link mu mimo mac protocol for ieee 802 11ac wlans"):
  with members:
    - "on the performance of packet aggregation in ieee 802 11ac mu mimo wlans"
    - "on the distributed construction of a collision free schedule in multi hop packet radio networks"

Connected through hyperedge HE-6 (induced by source paper "qos provisioning with adaptive backoff algorithm for ieee 802 11ac under multipacket reception"):
  with members:
    - "adaptive backoff algorithm for ieee 802 11 dcf under mpr wireless 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.NI(Networking and Internet Architecture)