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: "enhancing contention resolution aloha using combining techniques"
  Abstract: Recently, random access protocols have acquired a new wave of interest, not only from the satellite communication community, but also from researchers active in fields, such as Internet of Things and machine-to-machine. Asynchronous (slot- and frame-wise) ALOHA-like random access protocols, are very attractive for such applications, enabling low complexity transmitters and avoiding time synchronization requirements. Evolutions of ALOHA employ time diversity through proactive replication of packets, but the time diversity is not fully exploited at the receiver. Combining techniques, as selection combining and maximal-ratio combining, are beneficial and are adopted in the enhanced contention resolution ALOHA (ECRA) scheme, presented here. A tight approximation of the packet loss rate for asynchronous random access, including ECRA, well suited for the low channel load region is derived. Finally, ECRA is evaluated in terms of spectral efficiency, throughput and packet loss rate in comparison with recent protocols, showing that it is able to largely outperform both slotted synchronous and asynchronous schemes.

Connected through hyperedge HE-1 (induced by source paper "protograph ldpc code design for asynchronous random access"):
  with members:
    - "finite length analysis of irregular repetition slotted aloha in the waterfall region"
    - "random access channel coding in the finite blocklength regime"
    - "on frame asynchronous coded slotted aloha asymptotic finite length and delay analysis"
    - "error floor analysis of coded slotted aloha over packet erasure channels"
    - "coded slotted aloha a graph based method for uncoordinated multiple access"
    - "aloha random access that operates as a rateless code"
    - "low density parity check codes for nonergodic block fading channels"

Connected through hyperedge HE-2 (induced by source paper "multiple relay slotted aloha performance analysis and bounds"):
  with members:
    - "cooperative slotted aloha for massive m2m random access using directional antennas"
    - "coded slotted aloha a graph based method for uncoordinated multiple access"
    - "cooperative slotted aloha for multi base station systems"
    - "aloha random access that operates as a rateless code"

Connected through hyperedge HE-3 (induced by source paper "finite length analysis of irregular repetition slotted aloha in the waterfall region"):
  with members:
    - "finite length analysis of frameless aloha with multi user detection"
    - "on frame asynchronous coded slotted aloha asymptotic finite length and delay analysis"
    - "error floor analysis of coded slotted aloha over packet erasure channels"
    - "coded slotted aloha a graph based method for uncoordinated multiple access"
    - "broadcast coded slotted aloha a finite frame length analysis"
    - "aloha random access that operates as a rateless code"
    - "finite length scaling for iteratively decoded ldpc ensembles"

Connected through hyperedge HE-4 (induced by source paper "rate selection and power adaptation using maximal ratio combining for the random access gaussian channel"):
  with members:
    - "coded random access applying codes on graphs to design random access protocols"
    - "high throughput random access via codes on graphs coded slotted aloha"

Connected through hyperedge HE-5 (induced by source paper "grant free radio access for short packet communications over 5g networks"):
  with members:
    - "exploiting combination techniques in random access mac protocols enhanced contention resolution aloha"
    - "e 2 mac energy efficient medium access for massive m2m communications"
    - "2d time frequency interference modelling using stochastic geometry for performance evaluation in low power wide area networks"

Connected through hyperedge HE-6 (induced by source paper "detection and combining techniques for asynchronous random access with time diversity"):
  with members:
    - "all to all broadcast for vehicular networks based on coded slotted aloha"
    - "cooperative slotted aloha for multi base station systems"
    - "aloha random access that operates as a rateless code"
    - "optimum header positioning in successive interference cancellation sic based aloha"
    - "enhanced contention resolution aloha ecra"
    - "frameless aloha protocol for wireless 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)