视频实时传输在车辆自组网中的性能评估

Real-time Transmission Performance Evaluation of Video in VANET

设计了一种用于车辆自组网中视频实时传输性能评估的仿真平台,并在此仿真平台下做了相应的仿真实验来验证车载自组网中的各种相关机制对视频实时传输质量的影响.构建了不同的高速公路场景作为相应的仿真环境,并通过本文设计的仿真平台比较了几种路由协议的性能,以及统计了画面在不同真实车辆仿真环境下实时传输的丢失率和延时.仿真实验表明:AODV协议更适合本文构建的高速公路场景;视频实时传输的质量随着车辆之间初始跳数的增加而降低,特别是在初始跳数为8的条件下,画面丢失率会达到70%以上,平均延时会超过1 s;除此之外,车辆之间相对行驶形成的相对速度也严重影响视频的实时传输质量.

A simulation platform is designed to evaluate the real-time transmission quality of video in VANET; and different experiments under the designed simulation platform are carried out to validate the influence of every kind of related mechanism in VANET on the real-time transmission quality of video. The differ- ent scenes on expressways as the simulation environment are constructed to compare the performance of different routing protocols, and count the frame loss rate and delay of the transmitted video under different simulation environments through the designed simulation platform. The simulation result shows that. AODV protocol is more suitable to the constructed scenes in this paper~ the real-time transmission quality of video re- duces with the increase of the initial hops between vehicles, especially under the hop= 8 environment; the frame loss rate will reach more than 70%; the average frame delay will be more than 1s; in addition, the relative velocity between the vehicles severely affects the real-time transmission quality of video too.