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: "log convexity of rate region in 802 11e wlans"
  Abstract: In this paper we establish the log-convexity of the rate region in 802.11 WLANs. This generalises previous results for Aloha networks and has immediate implications for optimisation based approaches to the analysis and design of 802.11 wireless networks.

Connected through hyperedge HE-1 (induced by source paper "utility fair rate allocation in lte 802 11 networks"):
  with members:
    - "proportional fair mu mimo in 802 11 wlans"
    - "an overview of load balancing in hetnets old myths and open problems"
    - "rigorous and practical proportional fair allocation for multi rate wi fi"
    - "user network association in a wlan umts hybrid cell global individual optimality"

Connected through hyperedge HE-2 (induced by source paper "properties of an aloha like stability region"):
  with members:
    - "approaching throughput optimality in distributed csma scheduling algorithms with collisions"
    - "geometric approximations of some aloha like stability regions"

Connected through hyperedge HE-3 (induced by source paper "a control theoretic approach to achieve proportional fairness in 802 11e edca wlans"):
  with members:
    - "max min fairness in 802 11 mesh networks"

Connected through hyperedge HE-4 (induced by source paper "rigorous and practical proportional fair allocation for multi rate wi fi"):
  with members:
    - "a quantitative measure of fairness and discrimination for resource allocation in shared computer systems"

Connected through hyperedge HE-5 (induced by source paper "convexity conditions for 802 11 wlans"):
  with members:
    - "max min fairness in 802 11 mesh networks"

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)