论文标题

WiFi Edge的在线缓存和编码:收益和权衡

Online Caching and Coding at the WiFi Edge: Gains and Tradeoffs

论文作者

Chhangte, Lalhruaizela, Viterbo, Emanuele, Manjunath, D, Karamchandani, Nikhil

论文摘要

无线边缘的视频内容传递继续受到带宽不足和高度动态用户行为的挑战,这会影响有效的吞吐量和延迟。已经发现在网络边缘的缓存和编码的传输可改善视频内容传递的用户性能。无线边缘站(BSS,APS)和用户最终设备的缓存可以通过预处理内容或使用在线缓存策略来填充。在本文中,我们提出了一个系统,该系统通过在线缓存策略在WiFi网络的用户中进行缓存,并且WiFi AP使用编码的交付来将请求的内容交付给用户群体。用户处的高速缓存内容是索引编码的侧面信息。我们还向用户提出了LFU-INDEX缓存替换策略,可以明显地改善拟议系统WiFi AP的索引编码机会。通过广泛的仿真研究,我们通过编码来确定通过缓存和索引获得的收益。接下来,我们根据来自用户的不同内容请求行为的数据传输,延迟和吞吐量来分析它们之间的权衡。我们还表明,所提出的缓存替换策略比传统的缓存替换策略(如LRU和LFU)更好。

Video content delivery at the wireless edge continues to be challenged by insufficient bandwidth and highly dynamic user behavior which affects both effective throughput and latency. Caching at the network edge and coded transmissions have been found to improve user performance of video content delivery. The cache at the wireless edge stations (BSs, APs) and at the users' end devices can be populated by pre-caching content or by using online caching policies. In this paper, we propose a system where content is cached at the user of a WiFi network via online caching policies, and coded delivery is employed by the WiFi AP to deliver the requested content to the user population. The content of the cache at the user serves as side information for index coding. We also propose the LFU-Index cache replacement policy at the user that demonstrably improves index coding opportunities at the WiFi AP for the proposed system. Through an extensive simulation study, we determine the gains achieved by caching and index by coding. Next, we analyze the tradeoffs between them in terms of data transmitted, latency, and throughput for different content request behaviors from the users. We also show that the proposed cache replacement policy performs better than traditional cache replacement policies like LRU and LFU.

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