IEEE 802.11p 前导码插入在 C-V2X 辅助链路信号中的性能分析用于同频共存
Performance Analysis of IEEE 802.11p Preamble Insertion in C-V2X Sidelink Signals for Co-Channel Coexistence
AI总结：
研究提出在 LTE-V2X 辅助链路中插入 IEEE 802.11p 前导码以缓解同频共存碰撞，通过分析和模拟验证其在不同负载条件下的有效性。
摘要：
频谱稀缺是未来无线技术的主要挑战之一。在考虑车辆到万物（V2X）时，这一问题被放大，因为频谱共享可能影响道路安全和交通效率。因此，研究允许在相同地理区域和相同信道中共存当今主要 V2X 接入技术（即 IEEE 802.11p 和辅助链路 LTE-V2X 模式 4）的解决方案尤为重要。在本工作中，除了研究相互干扰的影响，我们证明其在拥堵信道条件下对第一和拥堵信道条件有强影响外，还研究了缓解方案，该方案基于在 LTE-V2X 辅助链路传输开始处插入 IEEE 802.11p 前导码。该方案也正在标准化机构中讨论，不需要修改 IEEE 802.11p 协议栈，仅需对 LTE-V2X 辅助链路进行小修改。该解决方案可直接应用于即将推出的 IEEE 802.11bd，并可扩展到 NR-V2X 辅助链路。通过自由流动和密集场景中的分析和模拟，本文表明该方案在低到高负载信道条件下能够缓解由同频共存引起的碰撞，并且在结合额外措施时，改进也适用于拥堵情况。在后者方面，特别是比较了不同方法，证明对拥堵控制机制进行干预是一种简单但有效的解决方案。
英文摘要：
Spectrum scarcity is one of the main challenges of future wireless technologies. When looking at vehicle-to-everything (V2X), this is amplified as spectrum sharing could impact road safety and traffic efficiency. It is therefore of particular importance to study solutions that allow the coexistence, in the same geographical area and in the same channels, of what are today the main V2X access technologies, namely IEEE 802.11p and sidelink LTE-V2X Mode 4. In this work, in addition to investigating the impact of the reciprocal interference, which we demonstrate to have a strong impact especially on the first and in congested channel conditions, a mitigation solution is extensively studied, which is based on the insertion of the IEEE 802.11p preamble at the beginning of the LTE-V2X sidelink transmission. The proposal, which is also under discussion within the standardization bodies, requires no modifications to the IEEE 802.11p protocol stack and minor changes to LTE-V2X sidelink. This solution is directly applicable to upcoming IEEE 802.11bd and extendable to NR-V2X sidelink. The paper shows, through analysis and simulations in free-flow and dense scenarios, that the proposal allows for a mitigation of collisions caused by co-channel coexistence under low to high-load channel conditions and that the improvement is also granted in congested cases when combined with additional countermeasures. Regarding the latter aspect, in particular, different approaches are compared, demonstrating that acting on the congestion control mechanisms is a simple but effective solution.
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