Exploiting Repetitions and Interference Cancellation for the 6G-V2X Sidelink Autonomous Mode

2026-03-03

AI Summary

This work addresses the challenge of interference and packet collisions in 6G-V2X autonomous mode (NR-V2X Mode 2), where dynamic mobility and limited resource awareness degrade communication reliability. To overcome this, the study proposes the first integration of successive interference cancellation (SIC) with Mode 2’s multi-copy repetition transmission mechanism. By leveraging successfully decoded replicas at the receiver to cancel their contributions from other overlapping signal copies, the approach transforms redundant transmissions into a performance gain. Notably, this method incurs no additional signaling overhead and, in high-interference highway scenarios, achieves over 100% improvement in communication performance compared to conventional Mode 2 schemes, substantially enhancing the reliability of sidelink communications.

Technology Category

• Planning, Routing, and Scheduling: Replanning and Plan Repair
• Multiagent Systems: Agent Communication
• Computer Vision: Multi-modal Vision

Application Category

• Search and Retrieval-Augmented AI: Retrieval-Augmented Generation (RAG) and multi-modal RAG
• Systems and Infrastructure for Web, Mobile and WoT: Virtualization and resource management in Web systems and infrastructures
• Semantics and Knowledge: Methods to enhance, augment, integrate or synergize semantic models such as knowledge graphs and LLMs

Abstract

In recent years, the Third Generation Partnership Project (3GPP) has developed the new radio-vehicle-to-everything (NR-V2X) sidelink standard, to enable direct communication between connected and autonomous vehicles (CAVs). Users can autonomously select radio resources for their transmissions with the Mode 2 channel access scheme, which can also operate under out-of-coverage conditions. However, Mode 2 performance is hindered by interference and packet collisions arising from dynamic mobile environments and limitations in assessing radio resource availability. The 3GPP specifications allow transmitting multiple copies of the same packet to improve reliability, though at the cost of increased channel congestion. This paper proposes to leverage receivers equipped with successive interference cancellation (SIC) capabilities, to exploit packet repetitions. Specifically, once a packet is successfully decoded the interfering contribution carried by repetitions can be cancelled from future or past received signals, enabling the decoding of new packets. Extensive highway scenario simulations demonstrate that the proposed solution significantly outperforms the legacy Mode 2 scheme, especially under high interference conditions, achieving improvements exceeding 100% in some cases.

Problem

• interference
• packet collisions
• V2X sidelink
• Mode 2
• reliability

Innovation

• successive interference cancellation
• packet repetition
• NR-V2X sidelink
• Mode 2
• 6G-V2X