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Distributed control for semi-grant-free non-orthogonal multiple access

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Abstract

Due to the huge number of devices with the differentiated requirement for latency and reliability, the uplink transmission of the Internet of Things (IoT) has the problem of excessive control signaling. In this regard, this paper proposes a distributed control strategy for Semi-Grant-Free (SGF) Non-Orthogonal Multiple Access (NOMA). By exploiting the distributed control strategy, the SGF protocol can provide services for multiple grant-free (GF) devices while ensuring reliable communications for grant-based (GB) devices with a few control signaling. Compared with the existing SGF protocol, this protocol can flexibly control the access number of GF devices and improve the communication quality of GF devices. To analyze the performance of the proposed SGF protocol, we propose the concept of service outage probability (SOP). Further, an exact expression of the SOP is obtained and an approximate solution is derived for more tractable results. Simulation results validate the theoretical results and demonstrate the advantage of the proposed SGF protocol.

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Notes

  1. The main focus in this article is on how to solve the conflicts when GF devices choose resources and ensure the communication quality of GB devices simultaneously. Whether GF devices have the same target rate mainly affects the optimal SIC demodulation order and resource block partitioning in the power domain. Therefore, studying scenarios where GF devices have different target rates does not contribute further insight into this article and is beyond the scope of this article, but will be an important direction of our future research.

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China (No.61971320, 62201421, 61901312), in part by the Key Industrial Innovation Chain Project in Industrial Domain under Grant 2023-ZDLGY-50, in part by the; Natural Science Basic Research Program of Shaanxi (No. 2021JQ-206, 2023-JC-QN-0717), in part by the Guangdong Basic and Applied Basic Research Foundation under Grant 2020A1515110084, and in part by the Fundamental Research Funds for the Central Universities. under Grant ZYTS23176.

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  1. State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an, 710071, China

    Mofan Luo, Baoyi Xu, Jian Chen, Long Yang, Yuchen Zhou, Mengmeng Ren & Bingtao He

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  1. Mofan Luo
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  2. Baoyi Xu
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Correspondence to Baoyi Xu.

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Luo, M., Xu, B., Chen, J. et al. Distributed control for semi-grant-free non-orthogonal multiple access. Wireless Netw 30, 309–320 (2024). https://doi.org/10.1007/s11276-023-03462-x

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