LTE系统视频业务的调度算法

A scheduling algorithm for optimizing video traffic

实时性是评价实时视频业务的重要指标之一,目前针对实时视频业务的已有调度算法还存在严重的时延拖尾现象。重点研究了该问题,在分析已有调度算法的基础上,提出了"最大吞吐率—最大权重时延优先"(modified largest weighted delay first,MT-LWDF)算法;理论分析了算法中β参数的取值范围,并通过仿真确定β的最优解,在此基础上,对视频业务的平均时延、最大时延、业务速率、丢帧率等性能进行了仿真,并与其他6种算法进行对比。结果表明,提出的MT-LWDF算法在优化视频业务的速率的基础上,有效降低时延拖尾现象。

Real-time is an important criterion for evaluation of the real-time video traffic. Most of the existing scheduling algorithms have a wide distribution of user time delay. Firstly, based on the analysis of the existing scheduling algorithms and system rate, an algorithm called MT-LWDF was proposed. Secondly, obtained the range ofβ after the theoretical analysis, the optimal value of β was got by computer simulation. Then, β was set with the optimal value, the simulation relating to average delay of the system, maximum delay of the users, rate of the system, video frame loss rate and other performance was done. And the results indicate that MT-LWDF algorithm can reduce the distribution of user delay at the same time of optimizing the rate of the system.