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 "towards massive connectivity support for scalable mmtc communications in 5g networks"):
  Abstract: The fifth generation of cellular communication systems is foreseen to enable a multitude of new applications and use cases with very different requirements. A new 5G multiservice air interface needs to enhance broadband performance as well as provide new levels of reliability, latency and supported number of users. In this paper we focus on the massive Machine Type Communications (mMTC) service within a multi-service air interface. Specifically, we present an overview of different physical and medium access techniques to address the problem of a massive number of access attempts in mMTC and discuss the protocol performance of these solutions in a common evaluation framework.

Includes members:
  Member "a random access protocol for pilot allocation in crowded massive mimo systems":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "massive mimo asymptotics for ray based propagation channels")
  Member "compressive coded random access for massive mtc traffic in 5g systems":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "compressive random access with multiple resource blocks and fast retrial")
  Member "reliable and efficient access for alarm initiated and regular m2m traffic in ieee 802 11ah systems":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "a traffic model for machine type communications using spatial point processes")
  Member "massive machine type communication mmtc access with integrated authentication":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "six key enablers for machine type communication in 6g")
  Member "reliable recovery of hierarchically sparse signals and application in machine type communications":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "simultaneous structures in convex signal recovery revisiting the convex combination of norms")
  Member "pulse shaped ofdm for 5g systems":
    also connected through other hyperedges:
      (none)
  Member "coded pilot access a random access solution for massive mimo systems":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "virtual carrier sensing based random access in massive mimo systems")
  Member "random access for massive mimo systems with intra cell pilot contamination":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "efficient pilot allocation for urllc traffic in 5g industrial iot networks")

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)