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: "reengineering gsm gprs towards a dedicated network for massive smart metering"
  Abstract: GSM is a synonym for a major success in wireless technology, achieving widespread use and high technology ma- turity. However, its future is questionable, as many stakeholders indicate that the GSM spectrum should be refarmed for LTE. On the other hand, the advent of smart grid and the ubiquity of smart meters will require reliable, long-lived wide area connections. This motivates to investigate the potential of GSM to be evolved into a dedicated network for smart metering. We introduce simple mechanisms to reengineer the access control in GSM. The result is a system that offers excellent support for smart metering, as well as the other massive machine-to-machine traffic patterns that are envisioned in 3GPP.

Connected through hyperedge HE-1 (induced by source paper "reliable and efficient access for alarm initiated and regular m2m traffic in ieee 802 11ah systems"):
  with members:
    - "massive m2m access with reliability guarantees in lte systems"
    - "reliable reporting for massive m2m communications with periodic resource pooling"
    - "capacity analysis of ieee 802 11ah wlans for m2m communications"

Connected through hyperedge HE-2 (induced by source paper "assessment of lte wireless access for monitoring of energy distribution in the smart grid"):
  with members:
    - "a tractable model of the lte access reservation procedure for machine type communications"
    - "what can wireless cellular technologies do about the upcoming smart metering traffic"
    - "analysis of the lte access reservation protocol for real time traffic"

Connected through hyperedge HE-3 (induced by source paper "massive m2m access with reliability guarantees in lte systems"):
  with members:
    - "joint estimation and contention resolution protocol for wireless random access"

Connected through hyperedge HE-4 (induced by source paper "a tractable model of the lte access reservation procedure for machine type communications"):
  with members:
    - "analysis of the lte access reservation protocol for real time traffic"

Connected through hyperedge HE-5 (induced by source paper "what can wireless cellular technologies do about the upcoming smart metering traffic"):
  with members:
    - "reliable reporting for massive m2m communications with periodic resource pooling"

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.IT(Information Theory)