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: "buffer aided relaying with adaptive link selection fixed and mixed rate transmission"
  Abstract: We consider a simple network consisting of a source, a half-duplex decode-and-forward relay with a buffer, and a destination. We assume that the direct source-destination link is not available and all links undergo fading. We propose two new buffer-aided relaying schemes with different requirements regarding the availability of channel state information at the transmitter (CSIT). In the first scheme, neither the source nor the relay has full CSIT, and consequently, both nodes are forced to transmit with fixed rates. In contrast, in the second scheme, the source does not have full CSIT and transmits with fixed rate but the relay has full CSIT and adapts its transmission rate accordingly. In the absence of delay constraints, for both fixed rate and mixed rate transmission, we derive the throughput-optimal buffer-aided relaying protocols which select either the source or the relay for transmission based on the instantaneous signal-to-noise ratios (SNRs) of the source-relay and relay-destination links. In addition, for the delay constrained case, we develop buffer-aided relaying protocols that achieve a predefined average delay. Compared to conventional relaying protocols, which select the transmitting node according to a predefined schedule independent of the instantaneous link SNRs, the proposed buffer-aided protocols with adaptive link selection achieve large performance gains. In particular, for fixed rate transmission, we show that the proposed protocol achieves a diversity gain of two as long as an average delay of more than three time slots can be afforded. Furthermore, for mixed rate transmission with an average delay of E{T} time slots, a multiplexing gain of r=1-1/ (2E{T}) is achieved. As a by-product of the considered link-adaptive protocols, we also develop a novel conventional relaying protocol for mixed rate transmission, which yields the same multiplexing gain as the protocol with adaptive link selection. Hence, for mixed rate transmission, for sufficiently large average delays, buffer-aided half-duplex relaying with and without adaptive link selection does not suffer from a multiplexing gain loss compared to full-duplex relaying.

Connected through hyperedge HE-1 (induced by source paper "performance of energy buffer aided incremental relaying in cooperative networks"):
  with members:
    - "incremental accumulate then forward relaying in wireless energy harvesting cooperative networks"
    - "wireless powered communication networks an overview"
    - "performance of adaptive link selection with buffer aided relays in underlay cognitive networks"
    - "a discrete time switching protocol for wireless powered communications with energy accumulation"
    - "energy harvesting two hop communication networks"
    - "on off transmission policy for wireless powered communication with energy storage"
    - "performance analysis of wireless powered communication with finite infinite energy storage"
    - "relaying protocols for wireless energy harvesting and information processing"

Connected through hyperedge HE-2 (induced by source paper "link selection for secure cooperative networks with buffer aided relaying"):
  with members:
    - "physical layer security of a buffer aided full duplex relaying system"
    - "simultaneous bidirectional link selection in full duplex mimo systems"
    - "effect of spatial interference correlation on the performance of maximum ratio combining"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "buffer aided relaying with adaptive link selection"
    - "relay placement for physical layer security a secure connection perspective"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"
    - "cooperative jamming for secure communications in mimo relay networks"

Connected through hyperedge HE-3 (induced by source paper "framework for discrete rate transmission in buffer aided underlay crn with direct path"):
  with members:
    - "on optimal spectrum access of cognitive relay with finite packet buffer"
    - "buffer aided relaying for the two hop full duplex relay channel with self interference"
    - "performance of adaptive link selection with buffer aided relays in underlay cognitive networks"
    - "buffer aided relaying with adaptive link selection"
    - "a simple cooperative diversity method based on network path selection"

Connected through hyperedge HE-4 (induced by source paper "effective optimization criteria and relay selection algorithms for physical layer security in multiple antenna relay networks"):
  with members:
    - "widely linear precoding for large scale mimo with iqi algorithms and performance analysis"
    - "direction finding algorithms based on joint iterative subspace optimization"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "multiuser diversity for secrecy communications using opportunistic jammer selection secure dof and jammer scaling law"
    - "adaptive distributed space time coding based on adjustable code matrices for cooperative mimo relaying systems"
    - "joint relay and jammer selection for secure two way relay networks"
    - "energy and spectral efficiency of very large multiuser mimo systems"
    - "collaborative relay beamforming for secrecy"

Connected through hyperedge HE-5 (induced by source paper "buffer aided relaying for the two hop full duplex relay channel with self interference"):
  with members:
    - "virtual full duplex buffer aided relaying in the presence of inter relay interference"
    - "all digital self interference cancellation technique for full duplex systems"
    - "on the capacity of the two hop half duplex relay channel"
    - "achievable rates for the fading half duplex single relay selection network using buffer aided relaying"
    - "a buffer aided successive opportunistic relay selection scheme with power adaptation and inter relay interference cancellation for cooperative diversity systems"
    - "effective capacity of buffer aided full duplex relay systems with selection relaying"
    - "capacity of the gaussian two hop full duplex relay channel with residual self interference"
    - "statistical delay tradeoffs in buffer aided two hop wireless communication systems"

Connected through hyperedge HE-6 (induced by source paper "study of buffer aided distributed space time coding for cooperative wireless networks"):
  with members:
    - "a buffer aided successive opportunistic relay selection scheme with power adaptation and inter relay interference cancellation for cooperative diversity systems"
    - "adaptive reduced rank receive processing based on minimum symbol error rate criterion for large scale multiple antenna systems"
    - "direction finding algorithms based on joint iterative subspace optimization"
    - "buffer aided relaying with adaptive link selection"
    - "adaptive distributed space time coding based on adjustable code matrices for cooperative mimo relaying systems"
    - "an efficient adaptive distributed space time coding scheme for cooperative relaying"
    - "a simple cooperative diversity method based on network path selection"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"

Connected through hyperedge HE-7 (induced by source paper "study of tomlinson harashima precoding strategies for physical layer security in wireless networks"):
  with members:
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "multiuser diversity for secrecy communications using opportunistic jammer selection secure dof and jammer scaling law"
    - "adaptive distributed space time coding based on adjustable code matrices for cooperative mimo relaying systems"
    - "joint relay and jammer selection for secure two way relay networks"
    - "energy and spectral efficiency of very large multiuser mimo systems"
    - "collaborative relay beamforming for secrecy"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-8 (induced by source paper "outage effective capacity of buffer aided diamond relay systems using harq with incremental redundancy"):
  with members:
    - "effective capacity of retransmission schemes a recurrence relation approach"
    - "backlog and delay reasoning in harq systems"
    - "achievable rates for the fading half duplex single relay selection network using buffer aided relaying"
    - "statistical delay tradeoffs in buffer aided two hop wireless communication systems"
    - "using superposition codebooks and partial decode and forward in low snr parallel relay networks"
    - "broadcast approaches to the diamond channel"

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)