卫星互联网光电混合交换技术综述

doi:10.11959/j.issn.1000-0801.2022284

Abstract

Abstract:

In the space environment where laser links and microwave links coexist, the development of satellite Internet optical/electric hybrid switching will help promoting the construction of air-space-ground integration.According to the characteristics and transmission requirements of satellite Internet services, the current status of electrical domain switching technology and optical domain switching technology were investigated and analyzed, and the applicability of existing switching technologies in the construction of satellite Internet was summarized.At the same time, according to the analysis results, the end-to-end network on the satellite was constructed, and based on this, the design of the optical/electric hybrid switching architecture on the satellite was completed.It mainly included the interface, electrical domain adaptation module, optical domain adaptation module, optical/electric convergence module, optical switching module, packet switching module and management control module.

Key words: satellite Internet, optical/electric hybrid switching, end-to-end network

CLC Number:

TP393

Zhenhua ZHANG, Siyue SUN, Gaosai LIU, Long WANG, Xinglong JIANG, Lin DONG, Guang LIANG. A survey of optical/electric hybrid switching technology for satellite Internet[J]. Telecommunications Science, 2022, 38(11): 1-10.

Figures/Tables 9

References 22

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星座	规模/颗	频段	服务
Iridium	66	L/Ka	语音通信
Starlink	4.2万	Ku/Ka/V	高速互联网
OneWeb	882	Ku/Ka/V	高速互联网
Kuiper	3 236	Ka	互联网
虹云	156	Ka	互联网
鸿雁	324	L/Ka	互联网

轨道类型	链路类型	传输介质	单端口速率	服务
星间轨道	同轨、异轨、跨层建链	激光/微波	多档速率（100 Mbit/s、2.5 Gbit/s、5 Gbit/s、10 Gbit/s、100 Gbit/s）	支持语音、图像、视频等应用服务
接入链路轨道	用户建链	微波	多用户、多频段
			速率差异大（1 Mbit/s～20 Gbit/s）
馈电链路轨道	信关站建链	微波	Ka频段
			10～20 Gbit/s

数据类型	资源类型	分组时延/ms	丢包率	可保证带宽
信令	non-GBR	100	10^-6	共享
会话类语音	GBR	100	10^-2	共享
会话类视频	GBR	150	10^-6	共享
非会话类视频	GBR	300	10^-6	共享
多媒体视频	non-GBR	300	10^-6	共享
TCP、P2P文件共享	non-GBR	300	10^-6	共享
专线业务	GBR	100	—	独占线路

交换技术	交换层面	可实现性	性能	当前星上适用性
OSU	电域	成熟	性能较好，但受限于电子瓶颈	适用
OCS	光域	成熟	传输容量大，但不灵活，适用于专线业务	不适用
OBS	光域	较成熟	业务粒度适中，传输效率较高，但拥塞对性能影响较大	适用
OPS	光域	不成熟	由于光器件不成熟，无法满足业务需求	不适用

A survey of optical/electric hybrid switching technology for satellite Internet

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