Enhancing the Reliability of NR-V2X Sidelink Broadcast Through Relaying and Dynamic Retransmission Control.

Authors

Neo Takahashi, Shiro Aoki, Suhua Tang

Published in

Sensors (Basel, Switzerland). Volume 26. Issue 20. Oct 09, 2026. Epub Oct 09, 2026.

Abstract

NR-V2X sidelink broadcast is an important communication mode for delivering safety-related information to surrounding vehicles with low latency. However, in non-line-of-sight (NLOS) environments such as intersections, direct links are blocked, and the blind retransmission mechanism defined for NR-V2X provides limited reliability improvement. This paper extends our previously reported relay-assisted retransmission scheme, RRT + ACK, which combines relay selection using link-quality indicators aggregated per direction (AvgLQIs/Dir) with ACK-assisted transfer of retransmission responsibility to the selected relay. The extension is a dynamic retransmission control (RT-Ctrl) method based on the Channel Busy Ratio (CBR), intended to limit retransmission-induced congestion. Simulations using Scenargie in NLOS intersection environments, under the assumption of ideal error-free ACK delivery, show that the basic RRT + ACK scheme improves the evaluation packet delivery ratio within 200 m (EPDR200m) by approximately 8.6% compared with conventional blind retransmission. Under high vehicle density, the RT-Ctrl method with the best parameter setting improves EPDR200m from 0.783 to 0.867 and reduces the average CBR from 0.594 to 0.329 compared with RRT + ACK using a fixed retransmission count.

PMID:
42944253
Bibliographic data and abstract were imported from PubMed on 27 Oct 2026.

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