A Data Scheduling Method for Video-on-Demand Systems on Radio Broadcasting Environments
A Data Scheduling Method for Video-on-Demand Systems on Radio Broadcasting Environments
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DOI：
10.1109/compsac51774.2021.00084
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
Satoru Matsumoto;T. Yoshihisa;S. Shimojo
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文献类型：
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作者：
Satoru Matsumoto;T. Yoshihisa;S. Shimojo
近年来，由于无线通信速度的提高，视频点播系统受到了广泛的关注。在传统的视频点播系统中，当接收视频数据的客户端数量增加时，会出现播放中断时间较长或缓冲时间较长的问题。因此，一些研究集中在采用广播式分发（B-VoD）的VoD系统上。在B-VoD系统中，视频文件被分成几个部分，分发服务器按照预定的播放时间表顺序播放，以减少中断时间。然而，传统的广播方法没有考虑到实际B-VoD系统中出现的问题，例如初始缓冲延迟和视频文件分割导致的数据大小增加。通过考虑它们，可以进一步减少中断时间。因此，在本研究中，我们提出一种B-VoD系统的数据段调度方法。我们在一个实际的B-VoD系统上测量了我们提出的方法的性能，该系统利用无线电广播（vhf频段）来实现广播型分布。实验结果证实，在不间断播放的情况下，通过将请求的视频数据分成6部分并并行播放，我们提出的方法可以减少到播放开始的等待时间，最多可减少85%。
Due to the increase in the speed of wireless communication in recent years, video-on-demand (VoD) systems has got great attention. In conventional VoD systems, when the number of clients receiving video data increases, the problems of longer playback interruptions or longer buffering times occur. Accordingly, several research focus on the VoD systems that adopt broadcast-type distribution (B-VoD). In B-VoD systems, video files are divided into several parts and distribution servers broadcast them in the sequences of predetermined broadcast schedules to reduce interruption time. However, conventional broadcasting methods do not consider the issues that occur in actual B-VoD systems, such as initial buffering delay and the increases of data sizes caused by video file division. Interruption time can be further reduced by considering them. Hence, in this research, we propose a data segment scheduling method for B-VoD systems. We measure the performance of our proposed method on an actual B-VoD system utilizing radio broadcasting (VHF-band) to achieve a broadcast-type distribution. The results of the experiments confirmed that, under the condition of an uninterrupted playback, the waiting time until the start of a playback can be reduced by up to 85% under our proposed method by dividing the requested video data into 6 parts and broadcasting the parts in parallel.