This article investigates the reliability gain of broadcast (BC)/broadband (BB) cooperation for mobile scalable video streaming. A specific form of BC-BB cooperation is introduced, which is referred to as cooperative casting . The proposed system primarily utilizes a BC transmission for streaming, while BB backup transmissions are requested whenever the BC signal is not decodable. For BC deliveries in this system, a cross-layer collaboration between scalable video coding (SVC) and layered-division multiplexing is used to improve spectral efficiency by coupling their hierarchical structures. In this end, in tandem with designing the uplink requesting rules based on channel status, delivery performance of the cooperative casting is analytically evaluated in a probabilistic framework. The system design and analyses presented in this article focus on the service continuity in a mobile and time-varying channel, where the physical aspects, such as delayed unicast response and inter-carrier interference, are carefully taken into account. Compared to the standalone network transmissions, the cooperative casting is numerically verified to better prevent the delivery failures in high-speed mobile channels, especially when the SVC layer-combined (full-scale video) service is intended. Furthermore, it is also shown that relaxing the criteria for the BB stream requesting can reduce delivery failures substantially, while it increases transmission redundancy.

中文翻译：

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基于LDM的地面广播和宽带单播之间的合作：在可伸缩视频流应用程序上

本文研究了用于移动可伸缩视频流的广播（BC）/宽带（BB）合作的可靠性增益。介绍了BC-BB合作的一种特定形式，称为合作铸造 。所提出的系统主要利用BC传输进行流传输，而每当BC信号不可解码时就请求BB备用传输。对于此系统中的BC交付，可伸缩视频编码（SVC）与分层分隔多路复用之间的跨层协作用于通过耦合其层次结构来提高频谱效率。为此，与基于信道状态设计上行链路请求规则相结合，在概率框架中分析性地评估了协作演员表的传递性能。本文介绍的系统设计和分析着重于移动和时变信道中的服务连续性，其中仔细考虑了诸如延迟单播响应和载波间干扰之类的物理方面。与独立网络传输相比，对协作转换进行了数值验证，可以更好地防止高速移动通道中的传递失败，尤其是在打算使用SVC层组合（全尺寸视频）服务的情况下。此外，还显示出放宽BB流请求的标准可以显着减少传送失败，同时增加传输冗余。