This paper presents a detailed quantitative evaluation of standardised Decentralised Congestion Control (DCC) and packet dropping mechanisms for Cellular V2X (C-V2X). Based on the identified shortcomings, an Access layer DCC scheme, RRI adaptive, is then proposed. RRI adaptive accommodates the sidelink scheduling mechanism Sensing Based Semi-Persistent Scheduling (SB-SPS), eliminating incompatibilities between current standards and the scheduling mechanism, to avoid unnecessary and reoccurring collisions. Two variants are proposed; one is an evolution of the ETSI Reactive DCC mechanism and the other aligns with the 3GPP approach based on channel occupancy ratio (CR). Both approaches are compared with current ETSI and 3GPP standards and exhibit improved performance. An evaluation of existing DCC standards and RRI Adaptive to meet the Quality of Service (QoS) requirements of vehicular cooperative awareness applications is also conducted.

翻译：本文详细介绍了对标准分散式控制(DCC)和细胞V2X(C-V2X)集包投放机制的详细定量评价。根据所查明的缺点,建议采用 " 存取层DCC " 办法,即RRI适应性适应性。RRI适应性适应性适应性适应性适应性适应性适应性适应性适应性适应性适应性适应性适应性,以适应基于遥感的半有效排期(SB-SPS)的边链排排排机制,消除现行标准和排期机制之间的不兼容性,以避免不必要的和重复发生的碰撞。提出了两个变式;一个变式;一个变式是ETSI Reactive DCC机制的演变,其他与基于频道占用率的3GPP方法的一致。这两种办法都与当前的ETSI和3GPP标准进行了比较,并展示了更好的业绩。还评估了现有的DCC标准和RRI适应性,以满足提高用户合作意识应用服务质量的要求。