Adaptation of the Modulation and Coding Scheme (MCS) within the Cellular Vehicle-To-Everything (C-V2X) sidelink has the potential for a wide range of applications including congestion control, support of variable packet sizes, density aware rate adaptation and improved support of unicast transmissions. However, the practical implementation of MCS adaptation presents a wide range of implications for the C-V2X radio resources, bandwidth, computation of power levels and operation of the scheduling mechanism. This paper presents the first study that provides a detailed analysis and an implemented model highlighting the implications of MCS adaptation on the operation of the Sensing-Based Semi-Persistent Scheduling (SB-SPS) mechanism within the C-V2X sidelink. To showcase the use of MCS adaptation for a particular purpose, a detailed analysis of its performance for distributed congestion control is undertaken, while considering different vehicular densities. The results indicate that MCS adaptation can be useful to reduce channel congestion by decreasing resource occupation but may not improve the overall packet delivery rate unless subchannel occupation is reduced. Finally, this study provides the foundation for other applications of MCS adaptation within the C-V2X sidelink.
翻译:移动和编码办法(MMCS)在“机动车辆换一切(C-V2X)”侧链接内的调整和编码办法(MMCS)的调整具有广泛的应用潜力,包括拥堵控制、支持可变包尺寸、对密度有认识的适应和改进对单式传输的支持,然而,对移动和编码办法的适应的实际实施对C-V2X无线电资源、带宽、动力水平的计算和排期机制的运作产生了范围广泛的影响。本文件介绍了第一份研究报告,其中提供了详细的分析和执行模式,突出了移动和编码办法的调整对C-V2X侧链接内基于遥感的半自动调度(SB-SPS)机制的运作的影响。为了展示为某一特定目的使用移动和编码和编码系统调整办法的情况,在考虑不同的车辆密度的同时,详细分析了其在分布式拥堵控制方面的性能。结果表明,移动和编码和编码系统调整有助于通过减少资源占用来减少频道拥堵,但除非减少子气网占用,否则可能不会提高总包件交付率。最后,这项研究为C2X的侧点其他应用MCSMCS调整提供了基础。