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arXiv 2108.08486cs.ITmath.IT
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一种新的基于笛卡尔积的编码缓存框架

Novel Frameworks for Coded Caching via Cartesian Product with Reduced Subpacketization

Jinyu Wang, Minquan Cheng, Kai Wan, Giuseppe Caire

摘要:

高速缓存在非高峰时间(即,{ \it放置阶段}),使得在峰值业务时间期间的传输数量(即,{ \it输送阶段})。编码缓存策略最初是由Maddah-Ali和Niesen(MN)提出的,与传统的未编码缓存相比,它可以获得多播增益,其中每个消息在交付阶段对多个用户同时有用。然而,MN编码的缓存方案遭受高的子分组化,这使得它不切实际。为了减少子分组的同时保留在交付阶段的多播机会,Yan等人提出了一种组合结构称为放置交付阵列(PDA)设计编码缓存方案。本文提出了两种新的基于笛卡尔积的PDA构造框架,该框架利用$K_1$用户PDA的$m$折叠笛卡尔积构造$mK_1$用户PDA.通过将所提出的框架应用于一些现有的PDA,获得三种新的缓存方案,可以显着减少MN方案的子分组化,同时稍微增加所需的传输次数。例如,对于适用于任何数量的用户和任何存储器机制的第三种方案,在将编码高速缓存增益减少1的同时,所需的子分组化至多是MN方案的子分组化的$O\left(\sqrt{\frac{K}{q}}2^{-\frac{K}{q}}\right)$,其中$K$是用户的数量,$0<z/q<1$是每个用户的存储器比率,并且$q,z$互质。

英文摘要:

Caching prefetches some library content at users' memories during the off-peak times (i.e., {\it placement phase}), such that the number of transmissions during the peak-traffic times (i.e., {\it delivery phase}) are reduced. A coded caching strategy was originally proposed by Maddah-Ali and Niesen (MN) leading to a multicasting gain compared to the conventional uncoded caching, where each message in the delivery phase is useful to multiple users simultaneously. However, the MN coded caching scheme suffers from the high subpacketization which makes it impractical. In order to reduce the subpacketization while retain the multicast opportunities in the delivery phase, Yan et al. proposed a combinatorial structure called placement delivery array (PDA) to design coded caching schemes. In this paper, we propose two novel frameworks for constructing PDA via Cartesian product, which constructs a PDA for $mK_1$ users by the $m$-fold Cartesian product of a PDA for $K_1$ users. By applying the proposed frameworks to some existing PDAs, three novel caching schemes are obtained which can significantly reduce the subpacketization of the MN scheme while slightly increasing the needed number of transmissions. For instance, for the third scheme which works for any number of users and any memory regime, while reducing the coded caching gain by one, the needed subpacketization is at most $O\left(\sqrt{\frac{K}{q}}2^{-\frac{K}{q}}\right)$ of that of the MN scheme, where $K$ is the number of users, $0<z/q<1$ is the memory ratio of each user, and $q,z$ are coprime.

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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