7,539 research outputs found
Edge-Caching Wireless Networks: Performance Analysis and Optimization
Edge-caching has received much attention as an efficient technique to reduce
delivery latency and network congestion during peak-traffic times by bringing
data closer to end users. Existing works usually design caching algorithms
separately from physical layer design. In this paper, we analyse edge-caching
wireless networks by taking into account the caching capability when designing
the signal transmission. Particularly, we investigate multi-layer caching where
both base station (BS) and users are capable of storing content data in their
local cache and analyse the performance of edge-caching wireless networks under
two notable uncoded and coded caching strategies. Firstly, we propose a coded
caching strategy that is applied to arbitrary values of cache size. The
required backhaul and access rates are derived as a function of the BS and user
cache size. Secondly, closed-form expressions for the system energy efficiency
(EE) corresponding to the two caching methods are derived. Based on the derived
formulas, the system EE is maximized via precoding vectors design and
optimization while satisfying a predefined user request rate. Thirdly, two
optimization problems are proposed to minimize the content delivery time for
the two caching strategies. Finally, numerical results are presented to verify
the effectiveness of the two caching methods.Comment: to appear in IEEE Trans. Wireless Commu
Caching Gain in Wireless Networks with Fading: A Multi-User Diversity Perspective
We consider the effect of caching in wireless networks where fading is the
dominant channel effect. First, we propose a one-hop transmission strategy for
cache-enabled wireless networks, which is based on exploiting multi-user
diversity gain. Then, we derive a closed-form result for throughput scaling of
the proposed scheme in large networks, which reveals the inherent trade-off
between cache memory size and network throughput. Our results show that
substantial throughput improvements are achievable in networks with sources
equipped with large cache size. We also verify our analytical result through
simulations.Comment: 6 pages, 4 figures, conferenc
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