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: "x lora an open source lpwa network"
  Abstract: Long Range (LoRa) network is emerging as one of the most promising systems in Low power wide area (LPWA) networks, since it enables the energy-constraint devices distributed over wide areas to establish affordable connectivity. Although the LoRa technology itself is quite mature and specific, how to efficiently deploy and manage various applications based on LoRa network so as to support a large massive of LoRa nodes is an open challenge. LoRa network server plays an indispensable role in protocol analysis, resource scheduling, and device management. This paper contributes by proposing a fleXible LoRa network server architecture named as X-LoRa with the features of high performance, easy deployment and open source. LoRa network server is modularized into four modules with different functions according to the microservice principles so as to reduce the coupling between modules and guarantee high scalability. Under the proposed architecture, the messaging system based on streaming data is utilized for the interaction between modules, which outperforms in throughput and low-latency delivery. Moreover, the implementation of X-LoRa is presented along with the technical features as well as the functionality of each module. The extensive experimental results demonstrate that X-LoRa can achieve the desirable performance and scalability to meet the requirements of diverse scenarios.

Connected through hyperedge HE-1 (induced by source paper "design and implementation of location and activity monitoring system based on lora"):
  with members:
    - "low power wide area networks an overview"
    - "soft defined heterogeneous vehicular network architecture and challenges"
    - "long range communications in unlicensed bands the rising stars in the iot and smart city scenarios"

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)