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: "uplink contention based scma for 5g radio access"
  Abstract: Fifth generation (5G) wireless networks are expected to support very diverse applications and terminals. Massive connectivity with a large number of devices is an important requirement for 5G networks. Current LTE system is not able to efficiently support massive connectivity, especially on the uplink (UL). Among the issues arise due to massive connectivity is the cost of signaling overhead and latency. In this paper, an uplink contention-based sparse code multiple access (SCMA) design is proposed as a solution. First, the system design aspects of the proposed multiple-access scheme are described. The SCMA parameters can be adjusted to provide different levels of overloading, thus suitable to meet the diverse traffic connectivity requirements. In addition, the system-level evaluations of a small packet application scenario are provided for contention-based UL SCMA. SCMA is compared to OFDMA in terms of connectivity and drop rate under a tight latency requirement. The simulation results demonstrate that contention-based SCMA can provide around 2.8 times gain over contention-based OFDMA in terms of supported active users. The uplink contention-based SCMA scheme can be a promising technology for 5G wireless networks for data transmission with low signaling overhead, low delay, and support of massive connectivity.

Connected through hyperedge HE-1 (induced by source paper "single or multiple frames content delivery for robust and secure communication in energy and spectrum efficient 5g networks"):
  with members:
    - "cost effective cache deployment in mobile heterogeneous networks"
    - "fairness and transmission aware caching and delivery policies in ofdma based hetnets"
    - "a new look at physical layer security caching and wireless energy harvesting for heterogeneous ultra dense networks"
    - "limited feedback scheme for device to device communications in 5g cellular networks with reliability and cellular secrecy outage constraints"
    - "joint backhaul access analysis of full duplex self backhauling heterogeneous networks"
    - "green ofdma resource allocation in cache enabled cran"
    - "joint hybrid backhaul and access links design in cloud radio access networks"
    - "exploiting device to device communications in joint scheduling of access and backhaul for mmwave small cells"

Connected through hyperedge HE-2 (induced by source paper "fairness and sum rate maximization via joint channel and power allocation in uplink scma networks"):
  with members:
    - "single or multiple frames content delivery for next generation networks"
    - "a survey on non orthogonal multiple access for 5g networks research challenges and future trends"
    - "fundamental limits of low density spreading noma with fading"
    - "modeling and analysis of scma enhanced d2d and cellular hybrid network"
    - "joint downlink base station association and power control for max min fairness computation and complexity"
    - "distributed pricing based user association for downlink heterogeneous cellular networks"
    - "scma for downlink multiple access of 5g wireless networks"
    - "scma codebook design"

Connected through hyperedge HE-3 (induced by source paper "joint transmitter and receiver design for pattern division multiple access"):
  with members:
    - "pattern division multiple access with large scale antenna array"
    - "a survey on non orthogonal multiple access for 5g networks research challenges and future trends"
    - "energy efficient joint resource allocation and power control for d2d communications"
    - "design of massive mimo noma with limited feedback"
    - "advanced coordinated beamforming for the downlink of future lte cellular networks"
    - "on the spectral efficiency and security enhancements of noma assisted multicast unicast streaming"
    - "an overview of transmission theory and techniques of large scale antenna systems for 5g wireless communications"
    - "the application of mimo to non orthogonal multiple access"

Connected through hyperedge HE-4 (induced by source paper "survey and performance evaluation of the upcoming next generation wlan standard ieee 802 11ax"):
  with members:
    - "ieee 802 11ax high efficiency wlans"
    - "mu mimo mac protocols for wireless local area networks a survey"
    - "leader contention based user matching for 802 11 multiuser mimo networks"
    - "multi round contention in wireless lans with multipacket reception"

Connected through hyperedge HE-5 (induced by source paper "a new multiple access technique for 5g power domain sparse code multiple access psma"):
  with members:
    - "a minorization maximization method for optimizing sum rate in the downlink of non orthogonal multiple access systems"
    - "fairness for non orthogonal multiple access in 5g systems"
    - "a general mimo framework for noma downlink and uplink transmission based on signal alignment"
    - "scma for downlink multiple access of 5g wireless networks"
    - "what will 5g be"
    - "on the performance of non orthogonal multiple access in 5g systems with randomly deployed users"

Connected through hyperedge HE-6 (induced by source paper "v2x meets noma non orthogonal multiple access for 5g enabled vehicular networks"):
  with members:
    - "sub channel assignment power allocation and user scheduling for non orthogonal multiple access networks"
    - "sub channel and power allocation for non orthogonal multiple access relay networks with amplify and forward protocol"
    - "full duplex mac protocol design and analysis"
    - "efficiency resource allocation for device to device underlay communication systems a reverse iterative combinatorial auction based approach"
    - "dynamic popular content distribution in vehicular networks using coalition formation games"

Connected through hyperedge HE-7 (induced by source paper "pattern division multiple access with large scale antenna array"):
  with members:
    - "design of massive mimo noma with limited feedback"
    - "an overview of transmission theory and techniques of large scale antenna systems for 5g wireless communications"
    - "what will 5g be"

Connected through hyperedge HE-8 (induced by source paper "a multi service oriented multiple access scheme for m2m support in future lte"):
  with members:
    - "massive mimo ten myths and one critical question"
    - "a multi service oriented multiple access scheme for next generation mobile 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)