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A Priority-Based Cross-Layer Design for Future VANETs through Full-Duplex Technology
IEEE Transactions on Vehicular Technology ( IF 6.8 ) Pub Date : 2020-07-01 , DOI: 10.1109/tvt.2020.2993923
Junwei Zang , Vahid Towhidlou , Mohammad-Reza Shikh-Bahaei

Among all requirements for vehicle-to-everything (V2X) communications, successful delivery of packets with small delay is of the highest significance. Especially, the delivery of a message before a potential accident (i.e. emergency message) should be guaranteed. In this work, we propose a novel cross-layer design to enhance the delivery of emergency messages so that accidents can be further avoided. Particularly, in the PHY layer, imperfect full-duplex (FD) simultaneous transmitting and sensing is analysed and dynamic thresholds for determining the channel status before and during transmissions are mathematically formulated. Then a novel FD MAC protocol, named priority-based multiple access (PBMA), based on prioritised messaging between different vehicles is proposed. Average collision probability, collision duration, waiting time as well as successful delivery rate of the system are formulated too. The delivery performance of emergency messages is also mathematically derived. In addition, comparisons have been made among three different mechanisms. Benchmark is the DSRC standard which uses half-duplex (HD) technology with enhanced distributed channel access (EDCA) protocol. We also compare our proposed protocol with FD EDCA. Simulations have verified the accuracy of our analysis. They have also illustrated the delivery of emergency messages has been enhanced by deploying our proposed design.

中文翻译:

通过全双工技术为未来 VANET 的基于优先级的跨层设计

在车对一切 (V2X) 通信的所有要求中,以小延迟成功交付数据包的重要性最高。尤其是,应该保证在潜在事故发生之前的消息(即紧急消息)的传递。在这项工作中,我们提出了一种新颖的跨层设计来增强紧急消息的传递,从而可以进一步避免事故。特别地,在 PHY 层,分析了不完美的全双工 (FD) 同时传输和感知,并在数学上制定了用于确定传输之前和传输期间信道状态的动态阈值。然后,提出了一种基于不同车辆之间优先消息传递的新型 FD MAC 协议,称为基于优先级的多路访问 (PBMA)。平均碰撞概率、碰撞持续时间、还制定了系统的等待时间和成功交付率。紧急消息的传递性能也是从数学上推导出来的。此外,还对三种不同的机制进行了比较。基准是 DSRC 标准,它使用半双工 (HD) 技术和增强型分布式信道访问 (EDCA) 协议。我们还将我们提出的协议与 FD EDCA 进行了比较。仿真验证了我们分析的准确性。他们还表明,通过部署我们提出的设计,紧急消息的传递得到了增强。基准是 DSRC 标准,它使用半双工 (HD) 技术和增强型分布式信道访问 (EDCA) 协议。我们还将我们提出的协议与 FD EDCA 进行了比较。仿真验证了我们分析的准确性。他们还表明,通过部署我们提出的设计,紧急消息的传递得到了增强。基准是 DSRC 标准,它使用半双工 (HD) 技术和增强型分布式信道访问 (EDCA) 协议。我们还将我们提出的协议与 FD EDCA 进行了比较。仿真验证了我们分析的准确性。他们还表明,通过部署我们提出的设计,紧急消息的传递得到了增强。
更新日期:2020-07-01
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