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arXiv 2101.01043cs.NI
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边缘缓存:中断概率

Caching at the Edge: Outage Probability

Estefanía Recayte, Andrea Munari

摘要:

在无线网络的边缘进行缓存是减少回程链路流量的关键技术。然而,在高峰期集中的请求量可能会导致系统中断,这意味着网络无法满足全部需求。中断概率是网络设计中需要考虑的一个基本指标。在本文中,我们推导出中断概率的解析表达式作为用户请求的总量,库大小,请求分布,缓存大小和回程资源的容量约束的函数。特别地,我们关注的场景是终端用户没有直接连接到主节点,主节点拥有可以请求的完整内容库。针对随机缓存和最流行的两种缓存机制,推导并研究了中断的一般表达式,给出了中断的精确闭合表达式,为在设计缓存网络的参数时如何平衡请求、内存和资源提供了有益的启示

英文摘要:

Caching at the edge of wireless networks is a keytechnology to reduce traffic in the backhaul link. However, aconcentrated amount of requests during peak-periods may causethe outage of the system, meaning that the network is not ableto serve the whole set of demands. The outage probability is afundamental metric to take into account during the networkdesign. In this paper, we derive the analytical expression ofthe outage probability as a function of the total amount ofusers requests, library size, requests distribution, cache size andcapacity constraints on the backhaul resources. In particular, wefocus on a scenario where end-users have no direct connectionto the master node which holds the complete library of contentthat can be requested. A general formulation of the outage isderived and studied for two relevant caching schemes, i.e. therandom caching scheme and the most popular caching schemes.The exact closed form expressions presented in this paper provideuseful insights on how requests, memory and resources can bebalanced when the parameters of a cache-enabled network haveto designed

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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