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首页> 外文期刊>International Journal of Innovative Computing Information and Control >A HANDOVER SCHEME FOR VIDEO STREAMING OVER HETEROGENEOUS MULTICAST/BROADCAST AND UNICAST NETWORKS
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A HANDOVER SCHEME FOR VIDEO STREAMING OVER HETEROGENEOUS MULTICAST/BROADCAST AND UNICAST NETWORKS

机译：异构多播/广播和Unicast网络上视频流的切换方案

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摘要

With the deployment of heterogeneous networks, mobile users are expecting ubiquitous connectivity when using applications. For bandwidth-intensive applications such as Internet Protocol Television (IPTV), multimedia contents are usually transmitted using multicast delivery method for reason of efficiency. However, not all networks support multicast delivery. Hence, multicast delivery could lead to service disruption when the users move from a multicast network to non-multicast network. In this paper, we propose a connection handover subsystem called Application Layer Seamless Switching (ALSS) to provide smooth multimedia delivery across multicast and unicast networks. Attention is paid on analyzing and fine-tuning the various stages within the third phase of vertical handoff process, i.e., handover execution in order to reduce handover latency needed by Mobile Terminals (MTs) to achieve seamless playback. A prototype has been implemented to study the overall handover delay, particularly on the overlapping period where both network interfaces were activated. Results showed that the overlapping period for Multicast-to- Unicast (M2U) and Unicast-to-Multicast (U2M) handover took a minimum of 56 and 4 milliseconds respectively. The measurement of Peak Signal-to-Noise Ratio (PSNR) further showed that the quality of received video frame during handover was at the minimum of 33dB which is categorized as good based on ITU-T recommendation.
机译：随着异构网络的部署，移动用户期望在使用应用程序时实现普遍连接。对于诸如互联网协议电视（IPTV）之类的带宽密集型应用，出于效率考虑，通常使用多播传送方法来传输多媒体内容。但是，并非所有网络都支持多播传递。因此，当用户从多播网络移动到非多播网络时，多播传递可能导致服务中断。在本文中，我们提出了一个称为应用程序层无缝交换（ALSS）的连接切换子系统，以在多播和单播网络之间提供流畅的多媒体传递。注意分析和微调垂直切换过程的第三阶段中的各个阶段，即切换执行，以减少移动终端（MT）实现无缝回放所需的切换等待时间。已经实现了一个原型来研究整体切换延迟，特别是在两个网络接口均被激活的重叠时段。结果显示，多播到单播（M2U）和单播到多播（U2M）切换的重叠时间分别最少花费56毫秒和4毫秒。峰值信噪比（PSNR）的测量进一步表明，切换过程中接收到的视频帧的质量至少为33dB，根据ITU-T的建议被归类为良好。

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