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: "spatial analysis of opportunistic downlink relaying in a two hop cellular system"
  Abstract: We consider a two-hop cellular system in which the mobile nodes help the base station by relaying information to the dead spots. While two-hop cellular schemes have been analyzed previously, the distribution of the node locations has not been explicitly taken into account. In this paper, we model the node locations of the base stations and the mobile stations as a point process on the plane and then analyze the performance of two different two-hop schemes in the downlink. In one scheme the node nearest to the destination that has decoded information from the base station in the first hop is used as the relay. In the second scheme the node with the best channel to the relay that received information in the first hop acts as a relay. In both these schemes we obtain the success probability of the two hop scheme, accounting for the interference from all other cells. We use tools from stochastic geometry and point process theory to analyze the two hop schemes. Besides the results obtained a main contribution of the paper is to introduce a mathematical framework that can be used to analyze arbitrary relaying schemes. Some of the main contributions of this paper are the analytical techniques introduced for the inclusion of the spatial locations of the nodes into the mathematical analysis.

Connected through hyperedge HE-1 (induced by source paper "secure transmission in linear multihop relaying networks"):
  with members:
    - "secure routing in multihop wireless ad hoc networks with decode and forward relaying"
    - "asymptotic deployment gain a simple approach to characterize the sinr distribution in general cellular networks"
    - "when does relay transmission give a more secure connection in wireless ad hoc networks"
    - "relay placement for physical layer security a secure connection perspective"
    - "an upper bound on multihop transmission capacity with dynamic routing selection"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"
    - "on the throughput cost of physical layer security in decentralized wireless networks"
    - "outage probability of general ad hoc networks in the high reliability regime"

Connected through hyperedge HE-2 (induced by source paper "throughput efficient large m2m networks through incremental redundancy combining"):
  with members:
    - "cooperative relaying for large random multihop networks"
    - "opportunistic routing in ad hoc networks how many relays should there be what rate should nodes use"

Connected through hyperedge HE-3 (induced by source paper "interference minimization in 5g heterogeneous networks"):
  with members:
    - "energy efficiency evaluation of cellular networks based on spatial distributions of traffic load and power consumption"
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"
    - "modeling heterogeneous network interference using poisson point processes"
    - "refim a practical interference management in heterogeneous wireless access networks"
    - "femtocell networks a survey"

Connected through hyperedge HE-4 (induced by source paper "cooperative relaying for large random multihop networks"):
  with members:
    - "throughput delay reliability tradeoff with arq in wireless ad hoc networks"
    - "random access transport capacity"
    - "opportunistic routing in ad hoc networks how many relays should there be what rate should nodes use"

Connected through hyperedge HE-5 (induced by source paper "cooperative relaying in a poisson field of interferers a diversity order analysis"):
  with members:
    - "the overall balance between cooperation and interference for a class of wireless networks"
    - "an overview of the transmission capacity of wireless networks"

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)