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Optimal multilevel media stream caching in cloud-edge environment

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Abstract

Due to the problem of high link load of edge cache and small storage space of edge server, a caching architecture by the collaborative of edge nodes and the cloud server is proposed. The content cache location is designed and optimized, which can be the content provider, cloud server (CS), and edge node (EN). In the proposed system, cloud servers collaborate with edge servers and the performance of content caching can be improved by coordinating caching on the cloud server or caching on the edge server. In this paper, a cloud-edge collaborative caching model based on the greedy algorithm is proposed, which includes the content caching model and collaborative caching model. Network architecture, file popularity estimation, link capacity, and other factors are considered in the model. Correspondingly, a cloud-edge collaborative cache algorithm based on a greedy algorithm is proposed. The related optimization problem is decomposed into the knapsack problem of cache layout in each layer, and then the greedy algorithm is used to solve the knapsack problem of cache placement and cooperative cache proposed in this paper. The affiliation between CS cache and EN caches in the layered architecture is improved and recognized. In the experimental results, the link load is reduced, the cache hit rate is improved by using the proposed method of edge caching, and it also has obvious advantages in the average end-to-end service delay.

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Acknowledgements

The work was supported by Key Research and Development Plan of Hubei Province (No.2020BAB102), Beijing Intelligent Logistics System Collaborative Innovation Center Open Project (No.BILSCIC-2019KF-02). Any opinions, findings, and conclusions are those of the authors and do not necessarily reflect the views of the above agencies.

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Authors and Affiliations

  1. School of Information, Beijing Wuzi University, Beijing, 101149, China

    Hengliang Tang & Chunlin Li

  2. Department of Computer Science, Wuhan University of Technology, Wuhan, 430063, People’s Republic of China

    Chunlin Li, Yihan Zhang & Youlong Luo

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  1. Hengliang Tang
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  2. Chunlin Li
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  3. Yihan Zhang
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  4. Youlong Luo
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Correspondence to Youlong Luo.

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Tang, H., Li, C., Zhang, Y. et al. Optimal multilevel media stream caching in cloud-edge environment. J Supercomput 77, 10357–10376 (2021). https://doi.org/10.1007/s11227-021-03683-x

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