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Vehicular communication systems rely on secure vehicle-to-vehicle(V2V) communications for safety-critical information exchange. However, the presence of eavesdropping vehicles poses a significant challenge. This paper investigates the security of V2V communications in reconfigurable intelligent surface(RIS)-assisted vehicular communication systems with spectrum sharing. It proposes a three-stage alternating optimization(TSAO) algorithm to address the complex problem of multiple eavesdropped V2V links that reuse the spectrum already occupied by vehicle-to-infrastructure(V2I) links. To solve the mixed-integer and non-convex optimization problem due to coupled variables and complex constraints, the algorithm decomposes the original problem into three easily solvable sub-problems: RIS reflection coefficient optimization, vehicle transmission power optimization, and spectrum sharing optimization. First, the RIS reflection coefficients are optimized by using the penalty convex-concave procedure(CCP) method. Second, the optimal power points are determined in the power optimization sub-problem. Finally, the spectrum sharing optimization sub-problem is constructed as a weighted bipartite graph matching problem and solved by using the optimal matching algorithm. The TSAO algorithm not only maximizes the sum V2V secrecy rate but also ensures the quality-of-service(QoS) requirements of the V2I links. Simulation results validate the superiority of the proposed algorithm and highlight the improvement in the sum V2V secrecy rate achieved by utilizing RIS technology in vehicular communication systems with spectrum sharing.
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Basic Information:
DOI：10.19884/j.1672-5220.202411019
China Classification Code:U495;TN92;TP18
Citation Information:
[1]LI Zhiwei,LI Demin,CHEN Xuemin.Sum V2V Secrecy Rate Maximization for RIS-Assisted Vehicular Communication Systems with Spectrum Sharing[J].Journal of Donghua University (English Edition),2026,43(01):68-79.DOI:10.19884/j.1672-5220.202411019.
Fund Information:
National Natural Science Foundation of China (Nos. 61772130, 71171045 and 61901104); Innovation Program of Shanghai Municipal Education Commission,China (No. 14YZ130)