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Placement Delivery Array Design for Coded Caching Scheme in D2D Networks

机译:D2D网络中的编码缓存方案的放置传送阵列设计

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Ji et al. (IEEE TRANSACTIONS ON INFORMATION THEORY, 62(2): 849-869, 2016) first studied coded caching in device-to-device (D2D) networks, and proposed a D2D coded caching scheme, which is referred to as the JCM scheme. In practice, we prefer to design a scheme with its two important targets, i.e., the rate (the maximal total amount of transmission) and packet number F, as small as possible. In this paper, we first propose a simple array called D2D placement delivery array (DPDA) to characterize the placement phase and the delivery phase in D2D networks. Consequently, some D2D coded caching schemes can be realized by an appropriate DPDA. Second, a lower bound on the rate of a DPDA is derived. And, we show that the JCM scheme achieves our lower bound. However, it is well known that its packet number F increases exponentially with the number of users K. So, we propose two classes of new schemes by constructing DPDAs. One reduces the packet number exponentially with K compared with the JCM scheme while keeping the rate near to our lower bound. The other further reduces F to increasing sub-exponentially with K.
机译:Ji等。 (IEEE TRANSACTIONS on INFORMATION THEORY,62(2):849-869,2016)首先研究了设备到设备(D2D)网络中的编码缓存,并提出了一种D2D编码缓存方案,称为JCM方案。实际上,我们倾向于设计一种方案,使其具有两个重要的目标,即速率(最大传输总量)和数据包数量F尽可能小。在本文中,我们首先提出一个称为D2D放置交付阵列(DPDA)的简单阵列,以表征D2D网络中的放置阶段和交付阶段。因此,一些D2D编码的缓存方案可以通过适当的DPDA来实现。其次,得出DPDA速率的下限。并且,我们证明了JCM方案可以达到我们的下限。但是,众所周知,其数据包数量F随着用户数量K呈指数增长。因此,我们通过构造DPDA提出了两类新方案。与JCM方案相比,一个包的数量与K呈指数关系减少,同时保持速率接近我们的下限。另一个将F减小到与K呈指数增长。

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