摘要
为了提高视频流数据的传输质量,减小视频流数据的失真率,从而提高网络中视频流数据的利用效率,提出了一种多用户视频流分布式最小失真调度方案。该方案采用相加模型来捕捉总的视频失真,建立起视频流失真模型,并通过M/G/1排队模型来进一步建模,得到视频流失真与视频流传输的延迟分布相关性函数,通过优化网络拥塞来进行系统的延迟约束,从而减小视频流失真率;通过同时考虑路由和速率分配问题来得到路由拥塞的最小化最优解,最大限度地减少网络的传输延迟。实验数据结果及对比分析表明,该方案在减小视频流失真比率、缩短视频流传输的延迟时间和控制网络丢包率上均取得了较好的效果。
In order to improve the transmission quality of the video data stream, reduce the distortion rate of the video data stream, and then improve network utilization efficiency of video data stream, this paper presented a multi-user video stream distributed scheme with minimum distortion scheduling. The program uses the model to capture the sum total of the video distortion, and establishes video stream distortion model. By further modelling with M/G/1 queuing model, the delay distribution correlation function about video distortion and transmission is gotten. By optimizing the network con- gestion, the delay for the system can be constrainted, thereby reducing the loss of straightforward video. The minimized optimal solution of routing congestion is gotten by considering routing and rate allocation of common questions, minimi- zing network transmission delays. Comparative analysis and experimental results show that the scheme achieves good results in reducing distortion ratio of the video, shortening latency of video stream transmission and controling packet loss rate.
出处
《计算机科学》
CSCD
北大核心
2015年第6期131-134,共4页
Computer Science
基金
河北省科学技术研究与发展计划项目(14K50123D)资助
关键词
多信道无线电网络
视频流
最小失真调度
相加模型
延迟约束
Multi-channel radio network
Video streaming
Minimal distortion scheduling
Additive model
Delay constraint
