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About this paper
Dong Liu, Binqiang Chen, Chenyang Yang, Andreas F. Molisch
This paper presents a comprehensive survey of caching at the wireless edge, distinguishing it from wired caching by detailing design aspects, placement and delivery strategies, and unique challenges inherent to wireless environments. The authors provide simulation results demonstrating its potential to achieve substantial gains in spectral and energy efficiency, while outlining critical future research directions.
Key insights
- Caching at the wireless edge yields significantly higher gains in Spectral Efficiency (up to 900%) and Energy Efficiency (up to 500%) compared to caching at the wired edge or no caching, primarily by alleviating backhaul congestion.
- Wireless-specific factors like content popularity prediction uncertainty, user mobility, small cache sizes, and the impact of fading and interference fundamentally alter caching design compared to wired networks.
- Crucial tradeoffs exist between performance metrics (SE, EE, offloading ratio) and system parameters (total cache size, energy consumption in D2D, collaboration distance).
Summary by alphaXiv.
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