标题： 无线设备到设备通信中的分布式缓存 显示英文标题

标题： Wireless Device-to-Device Communications with Distributed Caching

摘要： 我们引入了一种新颖的无线设备到设备（D2D）协作架构，该架构利用流行内容的分布式存储来实现频率复用。 我们确定了协作距离和干扰之间的基本冲突，并展示了如何优化传输功率以最大化频率复用。 我们的分析依赖于用户内容请求统计，这些统计由Zipf分布建模。 我们的主要结果是最佳协作距离的显式表达式，作为内容重用分布参数的函数。 我们表明，如果内容重用分布的Zipf指数大于1，则可以拥有数量与节点数成线性关系的D2D无干扰协作对。 如果Zipf指数小于1，我们确定了D2D协作链路数量的最佳可能扩展。 令人惊讶的是，一种非常简单的分布式缓存策略可以实现最优扩展行为，因此不需要集中协调每个节点的缓存内容。 显示英文摘要

摘要： We introduce a novel wireless device-to-device (D2D) collaboration architecture that exploits distributed storage of popular content to enable frequency reuse. We identify a fundamental conflict between collaboration distance and interference and show how to optimize the transmission power to maximize frequency reuse. Our analysis depends on the user content request statistics which are modeled by a Zipf distribution. Our main result is a closed form expression of the optimal collaboration distance as a function of the content reuse distribution parameters. We show that if the Zipf exponent of the content reuse distribution is greater than 1, it is possible to have a number of D2D interference-free collaboration pairs that scales linearly in the number of nodes. If the Zipf exponent is smaller than 1, we identify the best possible scaling in the number of D2D collaborating links. Surprisingly, a very simple distributed caching policy achieves the optimal scaling behavior and therefore there is no need to centrally coordinate what each node is caching.