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arXiv 2108.13801cs.NI
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面向延迟的并行调度算法

Optimal Latency-Oriented Scheduling in Parallel Queuing Systems

Andrea Bedin, Federico Chiariotti, Stepan Kucera, Andrea Zanella

摘要:

5G及以后网络的演进使新应用具有严格的端到端延迟要求,但在公共无线网络上提供可靠的低延迟服务和高吞吐量仍然是一个重大挑战。解决这个问题的一种可能方法是利用路径分集,对跨并行链路的多个流上的信息流进行编码。这种方法所提出的挑战是设计联合编码和调度算法,以适应链路的状态,以充分利用路径分集。在本文中,我们解决了这个问题的同步流量源,产生数据块在定期的时间间隔(例如,具有恒定帧速率的视频)并且需要在预定的期限内递送每个块。我们首先开发了一个封闭形式的性能分析在两个并行服务器没有任何缓冲和单包块的简单情况下,并提出了一个模型的一般问题的基础上的马尔可夫决策过程(MDP)。我们应用策略迭代来获得编码和调度策略,最大限度地提高在截止日期内交付的源块的比例:我们的模拟显示了不同的常用启发式解决方案的缺点,绘制一般的设计见解的最佳政策。

英文摘要:

The evolution of 5G and Beyond networks has enabled new applications with stringent end-to-end latency requirements, but providing reliable low-latency service with high throughput over public wireless networks is still a significant challenge. One of the possible ways to solve this is to exploit path diversity, encoding the information flow over multiple streams across parallel links. The challenge presented by this approach is the design of joint coding and scheduling algorithms that adapt to the state of links to take full advantage of path diversity. In this paper, we address this problem for a synchronous traffic source that generates data blocks at regular time intervals (e.g., a video with constant frame rate) and needs to deliver each block within a predetermined deadline. We first develop a closed-form performance analysis in the simple case of two parallel servers without any buffering and single-packet blocks, and propose a model for the general problem based on a Markov Decision Process (MDP). We apply policy iteration to obtain the coding and scheduling policy that maximizes the fraction of source blocks delivered within the deadline: our simulations show the drawbacks of different commonly applied heuristic solutions, drawing general design insights on the optimal policy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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