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: "towards a collision free wlan dynamic parameter adjustment in csma e2ca"
  Abstract: Carrier Sense Multiple Access with Enhanced Collision Avoidance (CSMA/ECA) is a distributed MAC protocol that allows collision-free access to the medium in WLAN. The only difference between CSMA/ECA and the well-known CSMA/CA is that the former uses a deterministic backoff after successful transmissions. Collision-free operation is reached after a transient state during which some collisions may occur. This article shows that the duration of the transient state can be shortened by appropriately setting the contention parameters. Standard absorbing Markov Chain theory can be used to describe the behaviour of the system in the transient state and to predict the expected number of slots to reach the collision-free operation. #R##N#The article also introduces CSMA/E2CA, in which a deterministic backoff is used two consecutive times after a successful transmission. CSMA/E2CA converges quicker to collision-free operation and delivers higher performance than CSMA/CA in harsh wireless scenarios with high frame error rates. #R##N#To achieve collision-free operations when the number of contenders is large, it may be necessary to dynamically adjust the contention parameter. The last part of the article suggests an approach for such parameter adjustment which is validated by simulation results.

Connected through hyperedge HE-1 (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"
    - "future evolution of csma protocols for the ieee 802 11 standard"
    - "decentralised learning macs for collision free access in wlans"
    - "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-2 (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-3 (induced by source paper "collision free operation in high density wlan deployments"):
  with members:
    - "a high efficiency mac protocol for wlans providing fairness in dense scenarios"
    - "implementation and experimental evaluation of a collision free mac protocol for wlans"
    - "a quantitative measure of fairness and discrimination for resource allocation in shared computer systems"

Connected through hyperedge HE-4 (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"
    - "future evolution of csma protocols for the ieee 802 11 standard"
    - "decentralised learning macs for collision free access in wlans"
    - "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-5 (induced by source paper "implementation and experimental evaluation of a collision free mac protocol for wlans"):
  with members:
    - "fairness in collision free wlans"
    - "future evolution of csma protocols for the ieee 802 11 standard"
    - "decentralised learning macs for collision free access in wlans"
    - "on the distributed construction of a collision free schedule in multi hop packet radio networks"
    - "a quantitative measure of fairness and discrimination for resource allocation in shared computer systems"

Connected through hyperedge HE-6 (induced by source paper "fast responsive decentralised graph colouring"):
  with members:
    - "decentralized constraint satisfaction"
    - "learning based constraint satisfaction with sensing restrictions"
    - "decentralised learning macs for collision free access in wlans"

Connected through hyperedge HE-7 (induced by source paper "future evolution of csma protocols for the ieee 802 11 standard"):
  with members:
    - "decentralized constraint satisfaction"
    - "learning based constraint satisfaction with sensing restrictions"
    - "decentralised learning macs for collision free access in wlans"
    - "on the distributed construction of a collision free schedule in multi hop packet radio networks"
    - "modelling a decentralized constraint satisfaction solver for collision free channel access"
    - "a quantitative measure of fairness and discrimination for resource allocation in shared computer systems"

Connected through hyperedge HE-8 (induced by source paper "decentralized constraint satisfaction"):
  with members:
    - "decentralised learning macs for collision free access in wlans"
    - "circumspect descent prevails in solving random constraint satisfaction problems"
    - "threshold values of random k sat from the cavity method"
    - "survey propagation an algorithm for satisfiability"

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)