A Probabilistic Repetition Coding-Based Access Method for Sporadic Traffic
Jingfang Ding, Meng Zheng, Yitian Wang, Nan Zhao, Haibin Yu · IEEE Transactions on Vehicular Technology · 2024
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 aq-Consecutive Repetition Coding based Contention scheme (q-CRCC). By introducing an activation probabilityqfor each repetition,q-CRCC effectively reduces access collisions for reliable transmissions. Furthermore, we establish an analytical reliability model ofq-CRCC and jointly optimize the activation probability and the number of repetitions to improve the transmission reliability ofq-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 ofq-CRCC are verified via extensive simulations.