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: "massive multiple access based on superposition raptor codes for cellular m2m communications"
  Abstract: Machine-to-machine (M2M) wireless systems aim to provide ubiquitous connectivity between machine-type communication (MTC) devices without any human intervention. Given the exponential growth of MTC traffic, it is of utmost importance to ensure that future wireless standards are capable of handling this traffic. In this paper, we focus on the design of a very efficient massive access strategy for highly dense cellular networks with M2M communications. Several MTC devices are allowed to simultaneously transmit in the same resource block by incorporating Raptor codes and a simple modulation scheme. This significantly reduces the access delay and improves the achievable system throughput. A simple yet efficient random access strategy is proposed to not only detect the selected preambles, but also estimate the number of devices which have chosen them. No device identification is needed in the random access phase which significantly reduces the signaling overhead. The proposed scheme is analyzed and the maximum number of MTC devices that can be supported in a resource block is characterized as a function of the message length, number of available resources, and the number of preambles. Simulation results show that the proposed scheme can effectively support a massive number of MTC devices for a limited number of available resources, when the message size is small.

Connected through hyperedge HE-1 (induced by source paper "hybrid resource scheduling for aggregation in massive machine type communication networks"):
  with members:
    - "finite blocklength communications in smart grids for dynamic spectrum access and locally licensed scenarios"
    - "massive non orthogonal multiple access for cellular iot potentials and limitations"
    - "aggregation and resource scheduling in machine type communication networks a stochastic geometry approach"
    - "spatiotemporal stochastic modeling of iot enabled cellular networks scalability and stability analysis"
    - "massive machine type communication with data aggregation and resource scheduling"
    - "maximizing the link throughput between smart meters and aggregators as secondary users under power and outage constraints"
    - "asymptotics and approximation of the sir distribution in general cellular networks"
    - "optimizing data aggregation for uplink machine to machine communication networks"

Connected through hyperedge HE-2 (induced by source paper "efficient scheduling for the massive random access gaussian channel"):
  with members:
    - "a joint graph based coding scheme for the unsourced random access gaussian channel"
    - "a coupled compressive sensing scheme for unsourced multiple access"
    - "gaussian multiple access via compute and forward"
    - "massive non orthogonal multiple access for cellular iot potentials and limitations"
    - "capacity of gaussian many access channels"
    - "sign compute resolve for tree splitting random access"
    - "code design for short blocks a survey"
    - "massive machine type communications in 5g physical and mac layer solutions"

Connected through hyperedge HE-3 (induced by source paper "success probability of grant free random access with massive mimo"):
  with members:
    - "random pilot and data access in massive mimo for machine type communications"
    - "random access preamble design and detection for 3gpp narrowband iot systems"
    - "rrh based massive mimo with on the fly pilot contamination control"
    - "random access protocols for massive mimo"
    - "a high throughput pilot allocation for m2m communication in crowded massive mimo systems"
    - "random access protocol for massive mimo strongest user collision resolution sucr"
    - "massive mimo for next generation wireless systems"
    - "emerging technologies and research challenges for 5g wireless networks"

Connected through hyperedge HE-4 (induced by source paper "virtual carrier sensing based random access in massive mimo systems"):
  with members:
    - "coded pilot access a random access solution for massive mimo systems"
    - "random access protocol for massive mimo strongest user collision resolution sucr"
    - "massive mimo for next generation wireless systems"
    - "what will 5g be"
    - "emerging technologies and research challenges for 5g wireless networks"
    - "five disruptive technology directions for 5g"

Connected through hyperedge HE-5 (induced by source paper "aggregation and resource scheduling in machine type communication networks a stochastic geometry approach"):
  with members:
    - "massive non orthogonal multiple access for cellular iot potentials and limitations"
    - "grant free massive noma outage probability and throughput"
    - "data aggregation and packet bundling of uplink small packets for monitoring applications in lte"
    - "spatiotemporal stochastic modeling of iot enabled cellular networks scalability and stability analysis"
    - "energy efficient scheduling and grouping for machine type communications over cellular networks"
    - "a delay optimal mac and packet scheduler for heterogeneous m2m uplink"
    - "massive machine type communication with data aggregation and resource scheduling"
    - "maximizing the link throughput between smart meters and aggregators as secondary users under power and outage constraints"

Connected through hyperedge HE-6 (induced by source paper "massive machine type communication with data aggregation and resource scheduling"):
  with members:
    - "massive non orthogonal multiple access for cellular iot potentials and limitations"
    - "spatiotemporal stochastic modeling of iot enabled cellular networks scalability and stability analysis"
    - "energy efficient scheduling and grouping for machine type communications over cellular networks"
    - "a delay optimal mac and packet scheduler for heterogeneous m2m uplink"
    - "e 2 mac energy efficient medium access for massive m2m communications"
    - "massive machine type communications in 5g physical and mac layer solutions"
    - "random cell association and void probability in poisson distributed cellular networks"
    - "aggregation and trunking of m2m traffic via d2d connections"

Connected through hyperedge HE-7 (induced by source paper "multiple access technologies for cellular m2m communications an overview"):
  with members:
    - "probabilistic rateless multiple access for machine to machine communication"

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)