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; 薛开平; 卢汉成

doi:10.11959/j.issn.2096-8930.2021016

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低轨小卫星网络中基于编码缓存的协同传输机制研究

专题：空间组网与交换技术 | 更新时间：2024-06-03

- 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
- 天地一体化信息网络 2021年2卷第2期页码：20-27
- 作者机构：
  
  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
- 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" ]
- 基金信息：
  
  国家自然科学基金面上项目;National Natural Science Foundation of China(61972371);中科院青年创新促进会优秀会员支持项目;Youth Innovation Promotion Association of the Chinese Academy of Sciences(Y202093)
- DOI：10.11959/j.issn.2096-8930.2021016
  中图分类号： TN927
- 网络出版日期：2021-06，
  
  纸质出版日期：2021-06-20
- 稿件说明：
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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.
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. DOI： 10.11959/j.issn.2096-8930.2021016.

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. DOI： 10.11959/j.issn.2096-8930.2021016.

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。

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.

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references

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