Enhancing Sidelink V2X Communication in 6G Networks: Power-Domain NOMA-Based Priority Message Transmission Approach

This research introduces a groundbreaking methodology that uses power-domain Non-Orthogonal Multiple Access (NOMA) to enhance Vehicle-to-Everything (V2X) communications in 6G networks. By prioritizing safety-critical Decentralized Event-Triggering Notification Messages (DENM) over Cooperative Awareness Messages (CAM) through differential power allocation, we ensure the integrity and timely delivery of vital data. The technique of superimposing different message types within a single subframe and Successive Interference Cancellation (SIC) at the receiver substantially improves spectral efficiency, bandwidth utilization, and communication reliability. Our simulations reveal significant enhancements in Packet Delivery Rate (PDR), End-to-End Latency (E2E), and Spectral Efficiency over traditional Orthogonal Multiple Access (OMA) approaches. This work not only paves the way for smarter, safer, and more efficient mobility solutions but also aligns with the evolving 6G standards, emphasizing our commitment to addressing the fundamental challenges in V2X communications.