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Optimal Throughput-Outage Analysis of Cache-Aided Wireless Multi-Hop D2D Networks

机译：高速缓存辅助无线多跳D2D网络的最佳吞吐量分析

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摘要

Cache-aided wireless device-to-device (D2D) networks have demonstrated more promising performance improvement for video distribution than conventional distribution methods; thus, understanding the fundamental scaling behavior of such networks is highly important. However, the existing scaling laws for multi-hop networks are not optimal even in the case of Zipf popularity distributions (gaps between upper and lower bounds are not constants); furthermore, there are no scaling law results for such networks for the more practical case of a Mandelbrot-Zipf (MZipf) popularity distribution. We thus in this work investigate the throughput-outage performance for cache-aided wireless D2D networks adopting multi-hop communications, with the MZipf popularity distribution for file requests and users distributed according to Poisson point process. We propose an achievable content caching and delivery scheme, and then analyze its performance. We obtain the optimal scaling law by showing that the achievable performance is tight to the proposed outer bound. Since the Zipf distribution is a special case of the MZipf distribution, the optimal scaling law for the networks considering the Zipf popularity distribution is also obtained, which closes the gap in literature.
机译：缓存辅助无线设备到设备（D2D）网络已经表明了比传统分布方法的视频分布更有希望的性能改进;因此，了解这些网络的基本缩放行为非常重要。然而，即使在ZIPF普及分布的情况下，即使在ZIPF普及分布（上限和下限之间的间隙不是常数）的情况下，对于多跳网络的现有缩放法也不是最佳的。此外，对于这种网络，对于Mandelbrot-ZIPF（MZIPF）普及分布的更实际情况，没有扩展法律结果。因此，我们在这项工作中调查了采用多跳通信的缓存辅助无线D2D网络的吞吐量 - 中断性能，具有根据Poisson Point过程的文件请求和用户分发的MZIPF流行分布。我们提出了可实现的内容缓存和交付方案，然后分析其性能。我们通过表明可实现的性能紧固到所提出的外部界限来获得最佳缩放法。由于ZIPF分布是MZIPF分布的特殊情况，因此还获得了考虑ZIPF普及分布的网络的最佳缩放法，其中缩短了文献中的差距。

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