低轨小卫星网络中基于编码缓存的协同传输机制研究

doi:10.11959/j.issn.2096-8930.2021016

天地一体化信息网络 ›› 2021, Vol. 2 ›› Issue (2): 20-27.doi: 10.11959/j.issn.2096-8930.2021016

所属专题：专题：空间组网与交换技术

• 专题：空间组网与交换技术 • 上一篇下一篇

低轨小卫星网络中基于编码缓存的协同传输机制研究

李健¹, 薛开平¹, 卢汉成²

¹ 中国科学技术大学网络空间安全学院，安徽合肥 230027
² 中国科学技术大学电子工程与信息科学系, 安徽合肥 230027

修回日期:2021-03-10 出版日期:2021-06-20 发布日期:2021-06-01
作者简介:李健（1992-），中国科学技术大学网络空间安全学院博士后，主要研究方向为天地一体化信息网络和未来网络架构
薛开平（1980-），中国科学技术大学网络空间安全学院教授，博士生导师，主要研究方向为未来网络体系架构和网络安全
卢汉成（1977-），中国科学技术大学电子工程与信息科学系副教授，主要研究方向为多媒体通信与网络、无线异构网络中的资源优化等
基金资助:
国家自然科学基金面上项目(61972371);中科院青年创新促进会优秀会员支持项目(Y202093)

Research on Coded Caching-Enabled Cooperative Transmission Mechanism in LEO Small Satellite Network

Jian LI¹, Kaiping XUE¹, Hancheng LU²

¹ School of Cyber Security, University of Science and Technology of China, Hefei 230027, China
² Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei 230027, China

Revised:2021-03-10 Online:2021-06-20 Published:2021-06-01
Supported by:
National Natural Science Foundation of China(61972371);Youth Innovation Promotion Association of the Chinese Academy of Sciences(Y202093)

摘要/Abstract

摘要：

随着低轨小卫星网络的快速发展，地面用户将可以借助密集部署的低轨卫星网络享受到全球覆盖的内容传输服务。由于星地通信链路往往具有长时延特性，再加上星上有限的通信和能量资源，卫星在提供内容传输服务的同时面临着传输开销的压力。因此，针对低轨小卫星网络，提出一种基于编码缓存的协同传输机制以实现高效的内容分发。通过采用细粒度的编码缓存方案，可以使得地面用户在请求内容数据时，同时接收来自多个低轨卫星节点缓存的编码数据，实现回程链路开销的降低与缓存效率的提升。仿真结果表明，在部署星上缓存后，可以降低39%以上的传输开销；当采用基于编码缓存的传输方案时，随着协同卫星数量的增加，可以进一步降低9%～42%的传输开销。

关键词: 低轨小卫星网络, 编码缓存, 协同传输, 内容分发

Abstract:

Along with the rapid development of low earth orbit (LEO) small satellite network, users can access content retrieval service through dense-deployed LEO satellite networks in the future.Due to the long propagation delay of satellite-to-terrestrial link, and also the constraint of limited communication resource and energy resource, it is diffi cult for satellites to provide effi cient content transmission service when facing the pressure of onboard overhead.A coded caching-based cooperative transmission mechanism was proposed in dense-deployed LEO small satellite network to achieve effi cient content distribution.By adopting fi ne-grained coded caching scheme, users could simultaneously receive cached packets from multiple LEO satellites to mitigated the cost of satellite backhaul link and improved the caching effi ciency.The simulation results showed that, after deploying onboard caching, the cost of content transmission could be reduced at least 39%.When coded caching-based transmission scheme was adopted, the cost of content transmission could be further reduced by 9%-42% with the increase of satellites providing cooperative transmission.

Key words: low earth orbit small satellite network, coded caching, cooperative transmission, content distribution

中图分类号:

TN927

李健, 薛开平, 卢汉成. 低轨小卫星网络中基于编码缓存的协同传输机制研究[J]. 天地一体化信息网络, 2021, 2(2): 20-27.

Jian LI, Kaiping XUE, Hancheng LU. Research on Coded Caching-Enabled Cooperative Transmission Mechanism in LEO Small Satellite Network[J]. Space-Integrated-Ground Information Networks, 2021, 2(2): 20-27.

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参数名称	参数值
卫星轨道高度	550 km
星间/星地一跳传输时延	1.8 ms
回程链路跳数H/跳	1
文件数量/个	10³

低轨小卫星网络中基于编码缓存的协同传输机制研究

Research on Coded Caching-Enabled Cooperative Transmission Mechanism in LEO Small Satellite Network

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