Optimized coded prefetching scheme in hierarchical cache-enabled networks

Tan, Yan, Wang, Ye, Gu, Shushi, Sun, Xianfan, Zhang, Qinyu, and Xiang, Wei (2020) Optimized coded prefetching scheme in hierarchical cache-enabled networks. In: Proceedings of the IEEE Wireless Communications and Networking Conference Workshops. From: WCNCW 2020: IEEE Wireless Communications and Networking Conference Workshops, 6-9 April 2020, Seoul, Korea.

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Abstract

Caching popular content at small base stations (SBSs) of a wireless edge network is a good choice to reduce user request latency and backhaul load. However, an effective coded caching scheme to solve the challenges in hierarchical cacheenabled networks (HCENs), including the limited SBS cache capacity, rich content amount, especially the deployment of coded prefetching, has not yet been fully studied. In this paper, we propose a caching scheme based on coded prefetching and coded transmission in HCENs. In particular, considering the impact of preference of users, the SBSs cache capacity, and the number of contents of coded linear combination, we design a cache probability matrix, where contents is stored at each SBS by linear combination with caching probability. Furthermore, the proposed algorithm including prefetching and transmission is analyzed, the expression of the system average delay is derived, and an optimization problem of minimizing the average delay is established to obtain the optimal cache probability matrix. Finally, the simulation results verify the effectiveness of our coded prefetching caching scheme, which can achieve lower average delay than other caching schemes with uncoded prefetching and coded transmission in HCENs.

Item ID: 67218
Item Type: Conference Item (Research - E1)
ISBN: 978-1-7281-5178-6
Keywords: average delay, coded prefetching, coded transmission, Hierarchical cache-enabled network, optimization
Copyright Information: © 2020 IEEE.
Funders: National Natural Science Foundation of China (NNSFC), Guangdong Science and Technology Planning Project (GSTPP), Shenzhen Basic Research Program (SBRP), Verification Platform of Multi-tier Coverage Communication Networkfor Ocean (VP)
Projects and Grants: NNSFC 61701136, NNSFC 61813008, NNSFC 61525103, GSTTP 2018B030322004, SBRP JCYJ20170811154233370, VP project PCL2018KP002
Date Deposited: 28 Apr 2021 23:09
FoR Codes: 40 ENGINEERING > 4006 Communications engineering > 400607 Signal processing @ 100%
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