Modeling and implementation of 5G edge caching over satellite

Abstract

The fifth generation (5G) wireless networks have to deal with the high data rate and stringent latency requirements due to the massive invasion of connected devices and data-hungry applications.Edge caching is a promising technique to overcome these challenges by prefetching the content closer to the end users at the edge node's local storage. In this paper, we analyze the performance of edge caching 5G networks with the aid of satellite communication systems. Firstly, we investigate the satellite-aided edge caching systems in two promising use cases: a) in dense urban areas, and b) in sparsely populated regions, e.g., rural areas. Secondly, we study the effectiveness of satellite systems via the proposed satellite-aided caching algorithm, which can be used in three configurations: i) mono-beam satellite, ii) multi-beam satellite, and iii) hybrid mode. Thirdly, the proposed caching algorithm is evaluated by using both empirical Zipf-distribution data and the more realistic Movielens dataset. Last but not least, the proposed caching scheme is implemented and tested by our developed demonstrators which allow real-time analysis of the cache hit ratio and cost analysis.

Two-Tier Cache-Aided Full-Duplex Hybrid Satellite–Terrestrial Communication Networks

“…Results show that the greater self interference cancellation parameter is, the worse performance FD transmission achieves, and the critical point where the FD mode performs worse than the HD mode is also determined. In addition, numerical results show that the proposed system outperforms the single-tier cache systems in [8]- [10] with at least 25% higher average SDP.…”

“…On the performance investigation of 5G edge caching over satellite, [10] uses off-line caching approaches to offload terrestrial backhaul networks. The proposal in [10] focuses on the multimode satellite backhaul in two use cases, i.e., dense urban areas and sparsely populated regions. The effectiveness of the system is studied by virtue of the cache hit ratio and cost per bit for satellite transmission.…”

Satellite Communications in the New Space Era: A Survey and Future Challenges

“…Therefore, bringing these two technologies together can further off-load the network. The main idea is to integrate the satellite with the terrestrial telecommunication systems in order to create a hybrid federated content delivery network, which can improve the user experience [264]- [267]. The application of satellite communications in feeding several network caches at the same time using broad/multi-cast is investigated in [264], [268], [269].…”

LEO satellite constellations to offload optical terrestrial networks in placement of popular content in 5G edge nodes

“…Only recently, the integration of satellite and terrestrial communication technologies has been seriously considered as part of 5G [3], and interesting papers have been published in this area [2]. For example, the authors of [4] studied the benefits of using a GEO satellite to feed several network caches at the same time, whereas the optimal placement of content on-board LEO satellites was considered in [5] to minimize the delay. Nevertheless, most of these reported results depend notably on the architecture that was implemented, and addressed mainly the dimensioning of the CDN to attain e.g.…”

“…Nevertheless, most of these reported results depend notably on the architecture that was implemented, and addressed mainly the dimensioning of the CDN to attain e.g. a given cache hit probability [4].…”