Fastening the initial access in 5G NR sidelink for 6G V2X networks

The ever-increasing demand for intelligent, automated, and connected mobility solutions pushes the development of innovative vehicular communications technology in framework sixth Generation (6G) cellular networks. A radical transformation on physical layer is planned, with a paradigm shift towards beam-based millimeter Waves or sub-Terahertz communications, which require precise beam pointing guaranteeing communication link, especially high mobility. key design aspect fast proactive Initial Access (IA) algorithm to select optimal be used. In this work, we investigate alternative IA techniques fasten current fifth-generation (5G) standard approach, targeting an efficient 6G design. First, discuss cooperative position-based schemes that rely position information. Then, motivated by intuition non-uniform distribution directions due road topology constraints, two Probabilistic Codebook (PCB) prioritized beams. first one, PCBs are built leveraging historical traffic information, while second use Hough Transform over digital map extract dominant directions. We also show information coming from angular probability allows designing codebook quantization, reducing degradation performances compared uniform one. Numerical simulation realistic scenarios shows PCB-based selection outperforms 5G terms number trials, performance comparable methods, without requiring signaling sensitive