human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "massive mimo for drone communications applications case studies and future directions"):
  Abstract: Unmanned aerial vehicles (UAVs), or drones, are proliferating. Several applications, such as surveillance, disaster management, and drone racing, place high requirements on the communication with the drones - in terms of throughout, reliability, 3D connectivity, and latency. Existing wireless technologies, notably WiFi, that are currently used for drone communications are limited to short ranges and low-mobility situations. A new, scalable technology is needed to meet future demands. Massive MIMO, a promising technology component of emerging 5G cellular networks, has the potential to meet these requirements. Specifically, Massive MIMO offers significant range extensions, support for fast-moving drones, and the possibility to spatially multiplex entire swarms of drones communicating simultaneously.

Includes members:
  Member "waveform and spectrum management for unmanned aerial systems beyond 2025":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "an autonomous spectrum management scheme for unmanned aerial vehicle networks in disaster relief operations")
  Member "survey of important issues in uav communication networks":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "throughput maximization of mixed fso rf uav aided mobile relaying with a buffer")
  Member "physical layer security for massive mimo an overview on passive eavesdropping and active attacks":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "downlink secrecy rate of one bit massive mimo system with active eavesdropping")

Question: Please tell me which class the source paper 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.IT(Information Theory)