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: "future evolution of csma protocols for the ieee 802 11 standard"
  Abstract: In this paper a candidate protocol to replace the prevalent CSMA/CA medium access control in Wireless Local Area Networks is presented. The proposed protocol can achieve higher throughput than CSMA/CA, while maintaining fairness, and without additional implementation complexity. Under certain circumstances, it is able to reach and maintain collision-free operation, even when the number of contenders is variable and potentially large. It is backward compatible, allowing for new and legacy stations to coexist without degrading one another's performance, a property that can make the adoption process by future versions of the standard smooth and inexpensive.

Connected through hyperedge HE-1 (induced by source paper "advanced ieee 802 11ax tcp aware scheduling under unreliable channels"):
  with members:
    - "coupled ieee 802 11ac and tcp goodput improvement using aggregation and reverse direction"
    - "ap initiated multi user transmissions in ieee 802 11ax wlans"
    - "simultaneous transmit and receive operation in next generation ieee 802 11 wlans a mac protocol design approach"
    - "ieee 802 11ax high efficiency wlans"
    - "resource management for ofdma based next generation 802 11 wlans"

Connected through hyperedge HE-2 (induced by source paper "traffic differentiation in dense wlans with csma eca dr mac protocol"):
  with members:
    - "a high efficiency mac protocol for wlans providing fairness in dense scenarios"
    - "mac protocols for ieee 802 11ax avoiding collisions on dense networks"
    - "traffic differentiation in dense collision free wlans using csma eca"

Connected through hyperedge HE-3 (induced by source paper "a high efficiency mac protocol for wlans providing fairness in dense scenarios"):
  with members:
    - "ieee 802 11ax high efficiency wlans"
    - "implementation and experimental evaluation of a collision free mac protocol for wlans"
    - "decentralised learning macs for collision free access in wlans"
    - "towards a collision free wlan dynamic parameter adjustment in csma e2ca"
    - "design and analysis of an asynchronous zero collision mac protocol"
    - "a quantitative measure of fairness and discrimination for resource allocation in shared computer systems"

Connected through hyperedge HE-4 (induced by source paper "scheduling strategies and throughput optimization for the downlink for ieee 802 11ax and ieee 802 11ac based networks"):
  with members:
    - "mac level throughput comparison 802 11ax vs 802 11ac"

Connected through hyperedge HE-5 (induced by source paper "ieee 802 11ax high efficiency wlans"):
  with members:
    - "on the interactions between multiple overlapping wlans using channel bonding"
    - "mu mimo mac protocols for wireless local area networks a survey"

Connected through hyperedge HE-6 (induced by source paper "traffic differentiation in dense collision free wlans using csma eca"):
  with members:
    - "a high efficiency mac protocol for wlans providing fairness in dense scenarios"
    - "ieee 802 11ax high efficiency wlans"
    - "decentralised learning macs for collision free access in wlans"
    - "towards a collision free wlan dynamic parameter adjustment in csma e2ca"
    - "design and analysis of an asynchronous zero collision mac protocol"
    - "a quantitative measure of fairness and discrimination for resource allocation in shared computer systems"

Connected through hyperedge HE-7 (induced by source paper "implementation and experimental evaluation of a collision free mac protocol for wlans"):
  with members:
    - "fairness in collision free wlans"
    - "decentralised learning macs for collision free access in wlans"
    - "on the distributed construction of a collision free schedule in multi hop packet radio networks"
    - "towards a collision free wlan dynamic parameter adjustment in csma e2ca"
    - "a quantitative measure of fairness and discrimination for resource allocation in shared computer systems"

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)