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QoS Enhancement In VoD Systems: Load Management And Replication Policy Optimization Perspectives

机译：VOD系统中的QoS增强：负载管理和复制策略优化视角

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摘要

The amount of online video content is exponentially increasing, which spurs its access demands. Providing optimal quality of service (QoS) for this ever-increasing video data is a challenging task due to the number of QoS constraints. The system resources, the distributed system platform and the transport protocol thus all need to collaborate to guarantee an acceptable level of QoS for the optimal video streaming process. In this paper, we present a comprehensive survey on QoS management for the video-on-demand systems. First, we focus on load management and replication algorithms in content delivery networks and peer-to-peer (P2P) networks for their shortcomings. We also address the problem of admission control and resource allocation with the objectives of congestion avoidance and frame-loss reduction. Besides, we introduce and discuss various replication schemes. For both the client-server architecture and P2P networks, we highlight the need for a specific storage management policy to preserve system reliability and content availability. We also focus on content distribution and streaming protocols scaling. We deduce that content availability is linked to the characteristics and the performance of the streaming protocols. Finally, we create a comparison table that presents the different contributions of the discussed approaches as well as their limitations. We believe that such a comprehensive survey provides useful insights and contributes to the related domains.
机译：在线视频内容的数量是指数增长的，其获取其访问需求。由于QoS限制的数量，为此，为此不断增长的视频数据提供最佳的服务质量（QoS）是一个具有挑战性的任务。因此，系统资源，分布式系统平台和传输协议都需要协作以保证最佳视频流过程的可接受的QoS水平。在本文中，我们对视频按需系统进行了全面的QoS管理调查。首先，我们专注于内容传递网络和对等（P2P）网络中的负载管理和复制算法，以实现其缺点。我们还通过拥塞避免和帧损失减少的目标解决了录取控制和资源分配问题。此外，我们介绍并讨论各种复制方案。对于客户端 - 服务器体系结构和P2P网络，我们突出了特定的存储管理策略的需要，以保留系统的可靠性和内容可用性。我们还专注于内容分发和流传输协议缩放。我们推断了内容可用性与流协议的特征和性能相关联。最后，我们创建了一个比较表，它提出了讨论的方法的不同贡献以及它们的局限性。我们认为，如此全面的调查提供了有用的见解并为相关领域做出了贡献。

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