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: "random access in dvb rcs2 design and dynamic control for congestion avoidance"
  Abstract: In the current DVB generation, satellite terminals are expected to be interactive and capable of transmission in the return channel with satisfying quality. Considering the bursty nature of their traffic and the long propagation delay, the use of a random access technique is a viable solution for such a Medium Access Control (MAC) scenario. In this paper, random access communication design in DVB-RCS2 is considered with particular regard to the recently introduced Contention Resolution Diversity Slotted Aloha (CRDSA) technique. This paper presents a model for design and tackles some issues on performance evaluation of the system by giving intuitive and effective tools. Moreover, dynamic control procedures that are able to avoid congestion at the gateway are introduced. Results show the advantages brought by CRDSA to DVB-RCS2 with regard to the previous state of the art.

Connected through hyperedge HE-1 (induced by source paper "64 apsk constellation and mapping optimization for satellite broadcasting using genetic algorithms"):
  with members:
    - "on the genetic optimization of apsk constellations for satellite broadcasting"
    - "a hierarchical modulation for upgrading digital broadcast systems"
    - "constellation design for transmission over nonlinear satellite channels"
    - "combining adaptive coding and modulation with hierarchical modulation in satcom systems"
    - "providing local content in a hybrid single frequency network using hierarchical modulation"

Connected through hyperedge HE-2 (induced by source paper "interference calculation in asynchronous random access protocols using diversity"):
  with members:
    - "average power limitations in sliding window contention resolution diversity slotted aloha"
    - "on the stability of asynchronous random access schemes"
    - "crdsa crdsa and irsa stability and performance evaluation"
    - "enhanced contention resolution aloha ecra"

Connected through hyperedge HE-3 (induced by source paper "on the genetic optimization of apsk constellations for satellite broadcasting"):
  with members:
    - "random access congestion control in dvb rcs2 interactive satellite terminals"
    - "constellation design for transmission over nonlinear satellite channels"

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)