Vehicular networks use Decentralized Congestion Control (DCC) mechanisms to operate effectively, but this mechanism may introduce queuing delays. Freshness of Cooperative Awareness Messages (CAMs) is critical for their usefulness. In this letter we explore how the presence of other types of traffic additional to CAMs, even with lower priorities, has an impact on the freshness of CAM messages due to DCC queuing. Finally, we propose Generate-on-Time (GoT), which is a simple mechanism that reduces DCC queuing delays for CAM messages without introducing any downside in other performance metrics.

翻译：车载网络采用分散式拥塞控制（DCC）机制以确保有效运行，但该机制可能引入排队延迟。协作感知消息（CAM）的时效性对其效用至关重要。本文探讨了除CAM外其他类型流量（即使优先级较低）的存在如何因DCC排队而影响CAM消息的时效性。最后，我们提出"即时生成"（Generate-on-Time，GoT）机制——一种简单的方法，可在不损害其他性能指标的前提下减少CAM消息的DCC排队延迟。