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Analysis of mobility speed impact on end-to-end communication performance in VANETs

机译：分析VANET中端到端通信性能的移动速度影响

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Vehicular ad hoc networks (VANETs) have the potential to enable communication among vehicles either directly using a vehicle-to-vehicle (V2V) communication model or through a road side unit (RSU) while using a vehicle-to-infrastructure (V2I) communication model. In multi-hop messaging, end-to-end (E2E) communication delay and messages reachability are essential performance indicators for VANET applications, which in-fact are critical criteria for safety related messaging services. Several investigations have been carried on the impact of different cars mobility patterns on communication performance in VANETs and over different road networks. However, and to the best of our knowledge, a study aiming towards the analysis of mobility speed differences and their impact on E2E delays and messages reachability has not been thoroughly investigated for sender-oriented messaging schemes in VANETs. This paper evaluates the impact of speed differences among vehicles over the performance of two widely adopted classes of messaging schemes in VANETs, namely the furthest distance and link quality based schemes. The considered schemes are devised using a sender-oriented relay selection mechanism due to its efficient utilization of channel bandwidth. Simulation experiments are performed over two mobility speed scenarios with the first depicting a small speed difference among vehicles while the other depicting a large difference in speed. Analysis of the obtained results reveals the following major findings. In scenarios with small speed differences, the furthest distance scheme exhibits lower E2E delays when compared to link quality based scheme with a difference of up to 29.5 msec. Conversely, large differences in mobility speed have noticeable adverse effects on furthest distance scheme resulting into it having higher E2E delays as compared to link quality scheme, with a difference of up to 127.43 msec. In-terms of message reachability, the link quality scheme prominently outperforms the further distance scheme in both speed difference scenarios. Consequently, the link quality scheme shows robustness towards the adverse effects resulting from large differences in mobility speed while further distance scheme struggles to do so. (c) 2020 Elsevier Inc. All rights reserved.
机译：车辆ad hoc网络（VANET）具有在使用车辆到基础设施（V2I）通信的同时直接使用车辆到车辆（V2V）通信模型或通过路侧单元（RSU）之间的车辆之间的通信。模型。在多跳消息传递中，端到端（E2E）通信延迟和消息可达性是VANET应用程序的基本性能指标，其实际上是安全相关消息服务的关键标准。几种调查已经对不同汽车移动模式对VANET和不同公路网络的通信性能的影响进行了影响。然而，据我们所知，旨在分析移动速度差异的一项研究及其对E2E延迟和信息的影响，并未对VANET中的发件人的消息传递计划进行彻底调查。本文评估了在VANET中的两个广泛采用的媒体传递方案的性能下的速度差异的影响，即最远距离和链路质量的方案。由于其高效利用信道带宽而设计，使用发送方的继电器选择机制设计了所考虑的方案。模拟实验在两个移动速度场景上进行，其中第一描绘车辆之间的小速度差，而另一个描绘了速度较大的差异。获得的结果分析揭示了以下主要发现。在具有小速度差异的情况下，与链路质量的方案相比，最远距离方案呈现较低的E2E延迟，其差异高达29.5毫秒。相反，移动速度的巨大差异对最远距离方案具有明显的不利影响，导致与链路质量方案相比具有更高的E2E延迟，差异高达127.43毫秒。信息到达性方面，链路质量方案在速度差异方案中突出地优于进一步的距离方案。因此，链路质量方案表现出朝着流动性速度大的差异导致的不利影响的鲁棒性，而进一步的距离方案努力这样做。 （c）2020 Elsevier Inc.保留所有权利。

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