The cellular vehicle-to-everything (C-V2X) sidelink technology, specified in the long-term evolution (LTE) and further improved in the 5G new radio (NR) standards to facilitate direct data exchange between vehicles, will play a crucial role in revolutionizing transportation systems. However, the demand for very high reliability and ultralow latency services especially challenges the sidelink resource allocation mechanism when performed by distributed vehicles, in the so- called autonomous mode. One of the major causes of performance degradation is the resource allocation mechanism, which was designed for orthogonal multiple access (OMA) and can generate interference and collisions under high load conditions. In this context, here we argue in favor of the use of non-OMA (NOMA) as a game changer for the sidelink in the upcoming 6G V2X, and the purpose of this article is to provide a reference for further intriguing studies in the field. Additionally, the gain achievable over conventional allocation schemes by enabling NOMA through the use of successive interference cancelation (SIC) at the receiver is measured through realistic simulations conducted when considering the latest C-V2X specifications.

中文翻译：

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迈向 6G 车联网侧链：自主模式下的非正交多址接入

在长期演进（LTE）中指定并在5G新空口（NR）标准中进一步改进以促进车辆之间直接数据交换的蜂窝车联网（C-V2X）侧链技术将发挥关键作用革新交通系统。然而，对非常高的可靠性和超低延迟服务的需求尤其挑战了由分布式车辆执行的侧链资源分配机制，即所谓的自治模式。性能下降的主要原因之一是资源分配机制，该机制专为正交多址接入 (OMA) 而设计，在高负载条件下会产生干扰和碰撞。在此背景下，我们在此主张在即将到来的 6G V2X 中使用非 OMA (NOMA) 作为侧链的游戏规则改变者，本文的目的是为该领域进一步有趣的研究提供参考. 此外，通过在考虑最新的 C-V2X 规范时进行的真实模拟来测量通过在接收器处使用连续干扰消除 (SIC) 启用 NOMA 可实现的传统分配方案的增益。