A Redundancy-Aware Two-Step Random Access for LEO Satellite Networks

In this letter, we propose a redundancy-aware two-step random access (2sRA) for LEO satellite networks. We investigate key features of message bundling (MB), and message redundancy elimination (MRE) techniques and integrate them into the 2sRA framework. In our proposed scheme, each user equipment (UE) can initiate multiple RA attempts in parallel using the MB technique, while the base station (BS) retains the collided payloads and attempts to recover them using successfully decoded payloads, leveraging the MRE technique. Simulation results demonstrate that our proposed scheme significantly improves both access success probability and re- source efficiency.