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: "lte phy layer vulnerability analysis and testing using open source sdr tools"
  Abstract: This paper provides a methodology to study the PHY layer vulnerability of wireless protocols in hostile radio environments. Our approach is based on testing the vulnerabilities of a system by analyzing the individual subsystems. By targeting an individual subsystem or a combination of subsystems at a time, we can infer the weakest part and revise it to improve the overall system performance. We apply our methodology to 4G LTE downlink by considering each control channel as a subsystem. We also develop open-source software enabling research and education using software-defined radios. We present experimental results with open-source LTE systems and shows how the different subsystems behave under targeted interference. The analysis for the LTE downlink shows that the synchronization signals (PSS/SSS) are very resilient to interference, whereas the downlink pilots or Cell-Specific Reference signals (CRS) are the most susceptible to a synchronized protocol-aware interferer. We also analyze the severity of control channel attacks for different LTE configurations. Our methodology and tools allow rapid evaluation of the PHY layer reliability in harsh signaling environments, which is an asset to improve current standards and develop new robust wireless protocols.

Connected through hyperedge HE-1 (induced by source paper "csai open source cellular radio access network security analysis instrument"):
  with members:
    - "security and protocol exploit analysis of the 5g specifications"
    - "performance analysis of a mission critical portable lte system in targeted rf interference"
    - "lte security protocol exploits and location tracking experimentation with low cost software radio"
    - "srslte an open source platform for lte evolution and experimentation"
    - "practical attacks against privacy and availability in 4g lte mobile communication systems"

Connected through hyperedge HE-2 (induced by source paper "analysis of non pilot interference on link adaptation and latency in cellular networks"):
  with members:
    - "narrowband iot data transmission procedures for massive machine type communications"
    - "a survey on legacy and emerging technologies for public safety communications"
    - "performance analysis of a mission critical portable lte system in targeted rf interference"

Connected through hyperedge HE-3 (induced by source paper "towards resilient 5g lessons learned from experimental evaluations of lte uplink jamming"):
  with members:
    - "discover your competition in lte client based passive data rate prediction by machine learning"
    - "easy 4g lte imsi catchers for non programmers"
    - "srslte an open source platform for lte evolution and experimentation"

Connected through hyperedge HE-4 (induced by source paper "security and protocol exploit analysis of the 5g specifications"):
  with members:
    - "defeating the downgrade attack on identity privacy in 5g"
    - "formal analysis of 5g authentication"
    - "the 5g aka authentication protocol privacy"
    - "extending lte into the unlicensed spectrum technical analysis of the proposed variants"
    - "performance analysis of a mission critical portable lte system in targeted rf interference"
    - "lte security protocol exploits and location tracking experimentation with low cost software radio"
    - "practical attacks against privacy and availability in 4g lte mobile communication systems"
    - "five disruptive technology directions for 5g"

Connected through hyperedge HE-5 (induced by source paper "5g nr jamming spoofing and sniffing threat assessment and mitigation"):
  with members:
    - "on error correction performance and implementation of polar code list decoders for 5g"
    - "performance analysis of a mission critical portable lte system in targeted rf interference"
    - "lte security protocol exploits and location tracking experimentation with low cost software radio"
    - "practical attacks against privacy and availability in 4g lte mobile communication systems"
    - "vulnerability of lte to hostile interference"

Connected through hyperedge HE-6 (induced by source paper "on security research towards future mobile network generations"):
  with members:
    - "control flow integrity precision security and performance"
    - "lte security protocol exploits and location tracking experimentation with low cost software radio"
    - "srslte an open source platform for lte evolution and experimentation"
    - "retrofitting mutual authentication to gsm using rand hijacking"
    - "practical attacks against privacy and availability in 4g lte mobile communication systems"
    - "improving air interface user privacy in mobile telephony"
    - "vulnerability of lte to hostile interference"

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)