Energy Efficiency of Downlink Networks With Caching at Base Stations
Dong Liu,Chenyang Yang +1 more
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TLDR
In this article, the authors explore the potential of EE of cache-enabled wireless access networks and identify the key factors that contribute more to the EE gain from caching, and derive the closed-form expression of the approximated EE.Abstract:
Caching popular contents at base stations (BSs) can reduce the backhaul cost and improve the network throughput. Yet whether locally caching at the BSs can improve the energy efficiency (EE), a major goal for fifth generation cellular networks, remains unclear. Due to the entangled impact of various factors on EE such as interference level, backhaul capacity, BS density, power consumption parameters, BS sleeping, content popularity, and cache capacity, another important question is what are the key factors that contribute more to the EE gain from caching. In this paper, we attempt to explore the potential of EE of the cache-enabled wireless access networks and identify the key factors. By deriving closed-form expression of the approximated EE, we provide the condition when the EE can benefit from caching, find the optimal cache capacity that maximizes the network EE, and analyze the maximal EE gain brought by caching. We show that caching at the BSs can improve the network EE when power efficient cache hardware is used. When local caching has EE gain over not caching, caching more contents at the BSs may not provide higher EE. Numerical and simulation results show that the caching EE gain is large when the backhaul capacity is stringent, interference level is low, content popularity is skewed, and when caching at pico BSs instead of macro BSs.read more
Citations
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A Survey of Energy-Efficient Techniques for 5G Networks and Challenges Ahead
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Cooperative Caching and Transmission Design in Cluster-Centric Small Cell Networks
TL;DR: In this paper, the authors considered a cluster-centric small cell network with combined design of cooperative caching and transmission policy, where small base stations (SBSs) are grouped into disjoint clusters, in which in-cluster cache space is utilized as an entity.
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Cooperative Edge Caching in User-Centric Clustered Mobile Networks
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A Survey of Caching Techniques in Cellular Networks: Research Issues and Challenges in Content Placement and Delivery Strategies
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Green and Mobility-Aware Caching in 5G Networks
TL;DR: Simulation results prove that the caching placement on SBS and on mobile devices leveraging user mobility is more efficient than other existing caching strategies in terms of both cache hit ratio and energy efficiency.
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