In vehicular ad hoc networks (VANETs), transmission power is a key factor in several performance measures, such as throughput, delay, and energy efficiency. Vehicle mobility in VANETs creates a highly dynamic topology that leads to a nontrivial task of maintaining connectivity due to rapid topology changes. Therefore, using fixed transmission power adversely affects VANET connectivity and leads to network performance degradation. New cross-layer power control algorithms called (BL-TPC 802.11MAC and DTPC 802.11 MAC) are designed, modeled, and evaluated in this paper. The designed algorithms can be deployed in smart cities, highway, and urban city roads. The designed algorithms improve VANET performance by adapting transmission power dynamically to improve network connectivity. The power adaptation is based on inspecting some network parameters, such as node density, network load, and media access control (MAC) queue state, and then deciding on the required power level. Obtained results indicate that the designed power control algorithm outperforms the traditional 802.11p MAC considering the number of received safety messages, network connectivity, network throughput, and the number of dropped safety messages. Consequently, improving network performance means enhancing the safety of vehicle drivers in smart cities, highway, and urban city.

中文翻译：

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通过设计车载自组织网络中的动态功率控制机制来增强安全消息通信的性能

在车载自组织网络 (VANET) 中，传输功率是多项性能指标的关键因素，例如吞吐量、延迟和能源效率。VANET 中的车辆移动性创建了一个高度动态的拓扑结构，由于拓扑结构的快速变化，这导致了维护连接的重要任务。因此，使用固定传输功率会对 VANET 连接产生不利影响，并导致网络性能下降。本文设计、建模和评估了新的跨层功率控制算法（BL-TPC 802.11MAC 和 DTPC 802.11 MAC）。设计的算法可以部署在智慧城市、高速公路和城市道路上。设计的算法通过动态调整传输功率来提高网络连接性，从而提高 VANET 性能。功率适配基于检查一些网络参数，例如节点密度、网络负载和媒体访问控制 (MAC) 队列状态，然后决定所需的功率级别。获得的结果表明，考虑到接收到的安全消息的数量、网络连接性、网络吞吐量和丢弃的安全消息的数量，设计的功率控制算法优于传统的 802.11p MAC。因此，提高网络性能意味着提高智慧城市、高速公路和城市中车辆驾驶员的安全性。以及丢弃的安全消息的数量。因此，提高网络性能意味着提高智慧城市、高速公路和城市中车辆驾驶员的安全性。以及丢弃的安全消息的数量。因此，提高网络性能意味着提高智慧城市、高速公路和城市中车辆驾驶员的安全性。