Grant-free access has been widely studied for ultra-reliable and low-latency communications in 5 G networks, wherein contention-based schemes are especially suitable for sporadic traffic. In this paper, we propose a q -Consecutive Repetition Coding based Contention scheme ( q -CRCC). By introducing an activation probability q for each repetition, q -CRCC effectively reduces access collisions for reliable transmissions. Furthermore, we establish an analytical reliability model of q -CRCC and jointly optimize the activation probability and the number of repetitions to improve the transmission reliability of q -CRCC. Besides, the multi-user detection technology is employed to alleviate collision failures. Finally, the accuracy of the obtained analytical reliability model and the advantages of q -CRCC are verified via extensive simulations.
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Ding et al. (2024) studied this question.
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