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Distributed rate allocation in inter-session network coding

机译:会话间网络编码中的分布式速率分配

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摘要

© 2014 IEEE. In this work, we propose a distributed rate allocation algorithm that minimizes the average decoding delay for multimedia clients in inter-session network coding systems. We consider a scenario where the users are organized in a mesh network and each user requests the content of one of the available sources. We propose a novel distributed algorithm where network users determine the coding operations and the packet rates to be requested from the parent nodes, such that the decoding delay is minimized for all clients. A rate allocation problem is solved by every user, which seeks the rates that minimize the average decoding delay for its children and for itself. Since this optimization problem is a priori non-convex, we introduce the concept of equivalent packet flows, which permits to estimate the expected number of packets that every user needs to collect for decoding. We then decompose our original rate allocation problem into a set of convex subproblems, which are eventually combined to obtain an effective approximate solution to the delay minimization problem. The results demonstrate that the proposed scheme eliminates the bottlenecks and reduces the decoding delay experienced by users with limited bandwidth resources. We validate the performance of our distributed rate allocation algorithm in different video streaming scenarios using the NS-3 network simulator. We show that our system is able to take benefit of inter-session network coding for simultaneous delivery of video sessions in networks with path diversity.
机译:©2014 IEEE。在这项工作中,我们提出了一种分布式速率分配算法,该算法将会话间网络编码系统中多媒体客户端的平均解码延迟最小化。我们考虑这样一种场景:用户被组织在一个网状网络中,每个用户都请求一个可用源中的内容。我们提出了一种新颖的分布式算法,其中网络用户确定要从父节点请求的编码操作和数据包速率,从而使所有客户端的解码延迟最小。速率分配问题由每个用户解决,该用户寻求速率以最小化其子代及其自身的平均解码延迟。由于此优化问题是先验非凸的,因此我们引入了等效数据包流的概念,该概念允许估计每个用户需要收集以进行解码的数据包的预期数量。然后,我们将原始的速率分配问题分解为一组凸子问题,这些子问题最终组合在一起,以获得有效的近似解决方案,以解决延迟最小化问题。结果表明,该方案消除了瓶颈,减少了带宽资源有限的用户所经历的解码延迟。我们使用NS-3网络模拟器在不同的视频流场景中验证了分布式速率分配算法的性能。我们证明了我们的系统能够利用会话间网络编码来在具有路径多样性的网络中同时交付视频会话。

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