Proceedings ArticleDOI
Strategies to meet the configured repetitions in URLLC Uplink Grant-Free transmission
Trung-Kien Le,Umer Salim,Florian Kaltenberger +2 more
- pp 597-601
TLDR
The numerical results show the benefit of these two methods in increasing system performance in case of less configured repetitions made when they help the system to avoid or reduce packet loss due to Demodulation Reference Signal (DMRS) miss-detection.Abstract:
In Ultra-Reliable Low-Latency Communication (URLLC), the user (UE) can be configured to transmit in grant-free/configured-grant (GF/CG) resources for uplink (UL) transmission that does not require the UE to transmit scheduling request (SR) and receive UL grant to reduce latency. In addition, the UE is also configured to transmit automatically a specific number of repetitions without waiting feedback. However, these repetitions are only allowed to carry out in an interval with period P to avoid identity (ID) confusion in a Hybrid automatic repeat request (HARQ) process. Thereby, there is a chance that the UE cannot transmit all repetitions as configured if data arrives late and it leads to a drop of reliability. Two approaches are proposed in this paper to cope with this problem. This first approach requires an usage of the explicit HARQ feedback structure and the second one is related to an additional SR transmitted by the UE in parallel with data. The numerical results show the benefit of these two methods in increasing system performance in case of less configured repetitions made when they help the system to avoid or reduce packet loss due to Demodulation Reference Signal (DMRS) miss-detection.read more
Citations
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Journal ArticleDOI
An Overview of Physical Layer Design for Ultra-Reliable Low-Latency Communications in 3GPP Releases 15, 16, and 17
TL;DR: In this paper, a detailed overview of the URLLC features from 5G Release 15 to Release 16 by describing how these features allow meeting ULLLC target requirements in 5G networks is presented.
Journal ArticleDOI
URLLC for 5G and Beyond: Requirements, Enabling Incumbent Technologies and Network Intelligence
TL;DR: In this article, the authors present a possibility to use the federated reinforcement learning (FRL) technique, which is one of the ML techniques, for 5G NR URLLC requirements and summarizes the corresponding achievements.
Proceedings ArticleDOI
Enhancing URLLC Uplink Configured-grant Transmissions
TL;DR: In this article, the reserved resources where the UEs can transmit the repetitions outside the original HARQ process until the configured number is reached are used to ensure the performance of UL CG transmission while SIC receiver minimizes the reserved resource's consumption.
Proceedings ArticleDOI
Optimal Configured Grant Selection Method for NR Rel-16 Uplink URLLC
TL;DR: This work proposes an algorithm to optimally select one of the grants configured by the network that meets both the latency and reliability requirements, using received bit information rate (RBIR) based link prediction.
Proceedings ArticleDOI
Improving Ultra-Reliable Low-Latency Communication in multiplexing with Enhanced Mobile Broadband in grant-free resources
TL;DR: A two-step strategy containing an overlap indication and explicit Hybrid automatic repeat request (HARQ) feedback is proposed to improve URLLC performance in multiplexing with eMBB and simulation results show that these two schemes help achieving URllC requirements by reducing error probability due to Demodulation Reference Signal miss-detection while allowing better resource efficiency.
References
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Proceedings ArticleDOI
Resource Allocation for Uplink Grant-Free Ultra-Reliable and Low Latency Communications
TL;DR: Numerical results based on theoretical analysis show that the target requirements of URLLC can be achieved with up to 70% reduction in resource utilization compared to the conservative transmission scheme.
Proceedings ArticleDOI
A Blind Retransmission Scheme for Ultra-Reliable and Low Latency Communications
TL;DR: This work proposes a scheme to perform blind retransmissions on shared radio resources together with the application of successive interference cancellation to receive remaining non-decoded data with low delay penalty, which avoids control errors and extra delays existent on feedback-based retransmission schemes.
Proceedings ArticleDOI
Optimal reserved resources to ensure the repetitions in Ultra-Reliable Low-Latency Communication Uplink Grant-free transmission
TL;DR: A scheme based on reserved resources is proposed to ensure the number of repetitions in a specific period and the size of each reserved resource is optimized depending on its position so as to reduce resource consumption.