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: "random access preamble design and detection for 3gpp narrowband iot systems"
  Abstract: Narrowband internet of things (NB-IoT) is an emerging cellular technology that will provide improved coverage for massive number of low-throughput low-cost devices with low device power consumption in delay-tolerant applications. A new single tone signal with frequency hopping has been designed for NB-IoT physical random access channel (NPRACH). In this letter we describe this new NPRACH design and explain in detail the design rationale. We further propose possible receiver algorithms for NPRACH detection and time-of-arrival estimation. Simulation results on NPRACH performance including detection rate, false alarm rate, and time-of-arrival estimation accuracy are presented to shed light on the overall potential of NB-IoT systems.

Connected through hyperedge HE-1 (induced by source paper "nb iot uplink receiver design and performance study"):
  with members:
    - "a primer on 3gpp narrowband internet of things nb iot"

Connected through hyperedge HE-2 (induced by source paper "success probability of grant free random access with massive mimo"):
  with members:
    - "massive multiple access based on superposition raptor codes for cellular m2m communications"
    - "random pilot and data access in massive mimo for machine type communications"
    - "rrh based massive mimo with on the fly pilot contamination control"
    - "random access protocols for massive mimo"
    - "a high throughput pilot allocation for m2m communication in crowded massive mimo systems"
    - "random access protocol for massive mimo strongest user collision resolution sucr"
    - "massive mimo for next generation wireless systems"
    - "emerging technologies and research challenges for 5g wireless networks"

Connected through hyperedge HE-3 (induced by source paper "latency energy tradeoff based on channel scheduling and repetitions in nb iot systems"):
  with members:
    - "self organized low power iot networks a distributed learning approach"
    - "an enhanced access reservation protocol with a partial preamble transmission mechanism in nb iot systems"
    - "narrowband iot data transmission procedures for massive machine type communications"
    - "evaluating the performance of emtc and nb iot for smart city applications"
    - "optimized lte data transmission procedures for iot device side energy consumption analysis"
    - "adaptive drx scheme to improve energy efficiency in lte networks with bounded delay"
    - "assessment of lte wireless access for monitoring of energy distribution in the smart grid"

Connected through hyperedge HE-4 (induced by source paper "a comparative survey of lpwa networking"):
  with members:
    - "low power wide area network analysis can lora scale"
    - "low power wide area networks an overview"
    - "emerging wireless technologies in the internet of things a comparative study"
    - "understanding the limits of lorawan"
    - "understanding the iot connectivity landscape a contemporary m2m radio technology roadmap"
    - "internet of things iot a vision architectural elements and future directions"

Connected through hyperedge HE-5 (induced by source paper "orla olaa orthogonal coexistence of laa and wifi in unlicensed spectrum"):
  with members:
    - "fair coexistence of scheduled and random access wireless networks unlicensed lte wifi"
    - "srslte an open source platform for lte evolution and experimentation"
    - "small cell traffic balancing over licensed and unlicensed bands"
    - "unlicensed lte wifi coexistence is lbt inherently fairer than csat"
    - "rigorous and practical proportional fair allocation for multi rate wi fi"
    - "control theoretic optimization of 802 11 wlans implementation and experimental evaluation"

Connected through hyperedge HE-6 (induced by source paper "an optimal stopping approach to cell selection in 5g networks"):
  with members:
    - "distributed opportunistic scheduling for energy harvesting based wireless networks a two stage probing approach"
    - "throughput optimal listen before talk for cellular in unlicensed spectrum"
    - "an overview of load balancing in hetnets old myths and open problems"
    - "what will 5g be"
    - "dynamic resource allocation for multiple antenna wireless power transfer"
    - "multi round contention in wireless lans with multipacket reception"

Connected through hyperedge HE-7 (induced by source paper "deep reinforcement learning for real time optimization in nb iot networks"):
  with members:
    - "polynomial regression as an alternative to neural nets"
    - "latency energy tradeoff based on channel scheduling and repetitions in nb iot systems"
    - "a primer on 3gpp narrowband internet of things nb iot"
    - "wide area wireless communication challenges for the internet of things"
    - "value function approximations for partially observable markov decision processes"

Connected through hyperedge HE-8 (induced by source paper "cooperative deep reinforcement learning for multiple group nb iot networks optimization"):
  with members:
    - "latency energy tradeoff based on channel scheduling and repetitions in nb iot systems"
    - "a primer on 3gpp narrowband internet of things nb iot"
    - "deep reinforcement learning with double q learning"

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)