Facing the dual challenges of massive access and time-sensitive traffics, grant-free non-orthogonal multiple access (GF-NOMA) emerges as a promising technology for implementing massive ultra-reliable and low-latency communications (mURLLC). In this paper, we propose a differentiated power level access (DPLA) policy that exploits the correlations among power levels of GF-NOMA, and implement DPLA by a dynamically distributed GF-NOMA framework. Further, a closed-form expression to the reliability of DPLA is analytically derived and the optimal framework parameters to maximize reliability are obtained. Finally, considering the traffic variation over time, we propose a dynamically-distributed differentiated-layered transmission $(\mathrm{D}^{3}$ LT) algorithm to improve the reliability online. Simulation results show that the proposed scheme in this work outweighs existing schemes in transmission reliability.


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    Title :

    A Novel Dynamically Differentiated Access Scheme for Massive Grant-Free NOMA


    Contributors:
    Wang, Yitian (author) / Zheng, Meng (author) / Yu, Haibin (author) / Liang, Wei (author)


    Publication date :

    2022-09-01


    Size :

    803470 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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