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 "energy efficient cooperative strategies for relay assisted downlink cellular systems part i theoretical framework"):
  Abstract: The impact of cognition on the energy efficiency of a downlink cellular system in which multiple relays assist the transmission of the base station is considered. The problem is motivated by the practical importance of relay-assisted solutions in mobile networks, such as LTE-A, in which cooperation among relays holds the promise of greatly improving the energy efficiency of the system. We study the fundamental tradeoff between the power consumption at the base station and the level of cooperation and cognition at the relay nodes. By distributing the same message to multiple relays, the base station consumes more power but it enables cooperation among the relays, thus making the transmission between relays to destination a multiuser cognitive channel. Cooperation among the relays allows for a reduction of the power used to transmit from the relays to the end users due to interference management and the coherent combining gains. These gain are present even in the case of partial or unidirectional transmitter cooperation, which is the case in cognitive channels such as the cognitive interference channel and the interference channel with a cognitive relay. We therefore address the problem of determining the optimal level of cooperation at the relays which results in the smallest total power consumption when accounting for the power reduction due to cognition. A practical design examples and numerical simulation are presented in a companion paper (part II).

Includes members:
  Member "practical coding schemes for cognitive overlay radios":
    also connected through other hyperedges:
      (none)
  Member "inner and outer bounds for the gaussian cognitive interference channel and new capacity results":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "cognitive radio networks an information theoretic perspective")
  Member "the capacity of the interference channel with a cognitive relay in very strong interference":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "cooperation for interference management a gdof perspective")
  Member "spatially coupled codes over the multiple access channel":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "ldpc coded multiuser shaping for the gaussian multiple access channel")
  Member "on the capacity of the interference channel with a cognitive relay":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "multi user cognitive interference channels a survey and new capacity results")

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)