车路通信环境下TD-LTE无线资源调度建模与仿真

为了改善现有车路通信方式覆盖范围小、交付时延大和传输速率低的现状,将TD-LTE技术引入车路通信接入系统。提出了基于TD-LTE的车路通信接入系统无线资源调度模型;构建了车路通信仿真场景,对比例公平算法、指数比例公平算法和改进的最大权重时延优先算法进行性能分析。仿真结果表明:车辆低速移动场景下,系统负载较低时指数比例公平算法性能较好,系统负载较高时改进的最大权重时延优先算法表现更优,比例公平算法不适合车路通信多媒体业务流调度;车辆高速移动场景下,三者都不适合车路通信多媒体业务流调度。

Research on resource scheduling algorithm in V2I communication access system based on TD-LTE

To improve the existing V2I communication mode with small-scale coverage,long delivery latency and low trans-mission rate,TD-LTE technology was introduced into V2I communication access system. A radio resource scheduling model based on TD-LTE is proposed for V2I communication access system. Three typical resource scheduling algorithms of PF,EXP and M-LWDF were tested and contrasted in different vehicle mobile simulation scenarios. Simulation results show that in slow moving scenario,when the system load is low,EXP algorithm can provide better performance;M-LWDF algorithm can perform better as load is enhenced;PF algorithm is not suitable for multi-media resource scheduling. In high moving scenario,all the three algorithms are not suitable.