| 基于分层网络的中心化和去中心化编码缓存方案 |
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| 作者姓名： | 汪科 陈家慧 吴幼龙 |
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| 作者单位： | 1.上海科技大学信息科学与技术学院, 上海 201210;2.中国科学院上海微系统与信息技术研究所, 上海 200050;3.中国科学院大学, 北京 100049 |
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| 基金项目： | 国家自然科学基金（61901267）和上海市浦江人才计划（18PJ1408500）资助 |
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| 摘 要： | 针对包含服务器、中继以及用户的分层网络,研究如何利用缓存降低传输延迟的问题.通过结合传统缓存和网络编码技术,提出新型的中心化和去中心化编码缓存方案.其中,中心化的方案根据中继、用户的数量以及缓存大小,对文件布置和发送策略进行优化设计,在满足用户文件请求的同时,实现数据的高效传输;去中心化的方案以牺牲少量性能为代价,支持...
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| 关 键 词： | 编码缓存 中继 中心化 去中心化 |
| 收稿时间： | 2020-02-12 |
| 修稿时间： | 2020-04-08 |
Coded caching in hierarchical network with centralized and decentralized strategy |
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| Authors: | WANG Ke CHEN Jiahui WU Youlong |
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| Institution: | 1.School of Information Science and Technology, ShanghaiTech University, Shanghai 201210, China;2.Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Science, Shanghai 200050, China;3.University of Chinese Academy of Science, Beijing 100049, China |
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| Abstract: | For a hierarchical network consisting of a server, multiple relays and multiple users, this paper studies on how to utilize cache at user and relay nodes to reduce the transmission delay. We propose novel coded caching schemes for the centralized and decentralized settings respectively. Our centralized scheme achieves better performance but requiring a fixing number of users, and our decentralized scheme supports flexible network change with only small loss of performance. Both schemes combine the traditional caching technology with network coding, and exploit the relays' cache resource to assist the transmission between the server and users. Moreover, our schemes allow parallel transmission between the server and relay, and achieve multicast gain by using coding during the delivery phase. The simulation results show that compared to the previous scheme, our schemes can greatly reduce the transmission delay without increasing the caching size. |
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| Keywords: | coded caching relay centralized decentralized |
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