Vehicle-to-Everything (V2X) communications enable the exchange of information among vehicles to improve road safety and traffic efficiency. As V2X deployments progress, vehicles are expected to support an increasing number of V2X services, often characterized by different priorities and data transmission requirements. However, existing V2X congestion control mechanisms primarily focus on maintaining channel load stability and fairness at the vehicle level, typically assuming homogeneous traffic demands. This paper proposes a demand- and priority-aware adaptive congestion control technique that explicitly accounts for heterogeneous and time-varying V2X service requirements. The results demonstrate that the proposed technique improves the satisfaction of V2X service demands while maintaining stable channel operation. The proposed technique aligns with current V2X standards, preserving backward compatibility while providing enhancements consistent with ongoing standardization activities.

翻译：车联网（V2X）通信通过车辆间的信息交换来提升道路安全与交通效率。随着V2X部署的推进，车辆预计将支持数量日益增长的V2X服务，这些服务通常具有不同的优先级和数据传输需求。然而，现有的V2X拥塞控制机制主要关注于在车辆层面维持信道负载的稳定性与公平性，通常假设流量需求是同质的。本文提出了一种按需与优先级感知的自适应拥塞控制技术，该技术明确考虑了异构且时变的V2X服务需求。结果表明，所提出的技术在维持信道稳定运行的同时，提高了V2X服务需求的满足度。该技术与现有V2X标准兼容，在保持向后兼容性的同时，提供了与当前标准化进程相一致的增强功能。