Caching in large wireless networks
In this chapter we study the fundamental theoretical underpinnings of wireless networks with caching capabilities. More specifically: 1. We present an analytical tool for simplifying the calculations required to decide the optimal content replication in a wireless network. This tool is used to derive the asymptotic laws of backhaul capacity scaling for multihop wireless networks. The presented results consider (i) the number of networks nodes N, (ii) the number of contents M, and (iii) the cache size K as the key system “size”parameters that increase arbitrarily at different proportions. By studying the different cases we extract valuable intuition into the benefits of caching for the sustainability of wireless networks. 2. We investigate the performance of dense cache-enabled small cell networks and provide useful insights on how the system operating values, the network topology and the interference affect the network performance. Using tools from stochastic geometry to model the node distribution, we provide guidelines where to place the most popular content, i.e., at the mobile device or at the AP/BS. The effect of spatial correlation in content requests is also analysed. 3. The chapter is concluded with a summary of interesting research directions for the future that can play a crucial role in the proliferation of caching as a wireless network technique.
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