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: "a high efficiency mac protocol for wlans providing fairness in dense scenarios"
  Abstract: Collisions are a main cause of throughput degradation in wireless local area networks. The current contention mechanism used in the IEEE 802.11 networks is called carrier sense multiple access with collision avoidance (CSMA/CA). It uses a binary exponential backoff technique to randomize each contender attempt of transmitting, effectively reducing the collision probability. Nevertheless, CSMA/CA relies on a random backoff that while effective and fully decentralized, in principle is unable to completely eliminate collisions, therefore degrading the network throughput as more contenders attempt to share the channel. To overcome these situations, carrier sense multiple access with enhanced collision avoidance (CSMA/ECA) is able to create a collision-free schedule in a fully decentralized manner using a deterministic backoff after successful transmissions. Hysteresis and fair share are two extensions of CSMA/ECA to support a large number of contenders in a collision-free schedule. CSMA/ECA offers better throughput than CSMA/CA and short-term throughput fairness. This paper describes CSMA/ECA and its extensions. In addition, it provides the first evaluation results of CSMA/ECA with non-saturated traffic, channel errors, and its performance when coexisting with CSMA/CA nodes. Furthermore, it describes the effects of imperfect clocks over CSMA/ECA and presents a mechanism to leverage the impact of channel errors and the addition/withdrawal of nodes over collision-free schedules. Finally, the experimental results on throughput and lost frames from a CSMA/ECA implementation using commercial hardware and open-source firmware are presented.

Connected through hyperedge HE-1 (induced by source paper "exploiting csma eca and adaptive sensitivity control for simultaneous transmit and receive in ieee 802 11 wlans"):
  with members:
    - "simultaneous transmit and receive operation in next generation ieee 802 11 wlans a mac protocol design approach"
    - "design and characterization of a full duplex multiantenna system for wifi networks"
    - "in band full duplex wireless challenges and opportunities"
    - "experiment driven characterization of full duplex wireless systems"

Connected through hyperedge HE-2 (induced by source paper "traffic differentiation in dense wlans with csma eca dr mac protocol"):
  with members:
    - "mac protocols for ieee 802 11ax avoiding collisions on dense networks"
    - "traffic differentiation in dense collision free wlans using csma eca"
    - "future evolution of csma protocols for the ieee 802 11 standard"

Connected through hyperedge HE-3 (induced by source paper "ap initiated multi user transmissions in ieee 802 11ax wlans"):
  with members:
    - "performance analysis of dynamic channel bonding in spatially distributed high density wlans"
    - "ieee 802 11ax high efficiency wlans"
    - "collision free operation in high density wlan deployments"
    - "on the interactions between multiple overlapping wlans using channel bonding"
    - "mu mimo mac protocols for wireless local area networks a survey"
    - "resource management for ofdma based next generation 802 11 wlans"
    - "analysis of dynamic channel bonding in dense networks of wlans"

Connected through hyperedge HE-4 (induced by source paper "collision free operation in high density wlan deployments"):
  with members:
    - "implementation and experimental evaluation of a collision free mac protocol for wlans"
    - "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"

Connected through hyperedge HE-5 (induced by source paper "traffic differentiation in dense collision free wlans using csma eca"):
  with members:
    - "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"
    - "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"

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)