A Two-Stage Resource Allocation for SCMA-Based C-V2X Networks

The increasing demand for the internet of vehicle (IoV) services has prompted the prosperity of cellular-based vehicle-to-everything (C-V2X). This paper investigates the resource allocation in an uplink SCMA-enabled C-V2X network. At the aim to maximize the sum rate of cellular links in condition of guaranteeing the reliability of V2X links, we propose a Two-Stage space code multiple access (SCMA) codebook allocation algorithm. The complicated resource matching problem is transformed into a 2-D matching problem by using V2X grouping algorithm at first. Then a Matching-Auction-based codebook allocation algorithm is adopted to address the issue of matching conflict. Finally, numerical simulation results indicate that the proposed scheme outperforms in terms of the sum data transmission rate of the cellular links and the reliability of V2X links.