A Routing and Wavelength Assignment Algorithm Based on Two Types of LEO Constellations in Optical Satellite Networks
A Routing and Wavelength Assignment Algorithm Based on Two Types of LEO Constellations in Optical Satellite Networks
复制标题
光卫星网络中基于两种LEO星座的路由和波长分配算法
DOI：
10.1109/jlt.2020.2965185
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发表时间：
2020-04-15
影响因子：
4.7
通讯作者：
Cao, Suzhi
中科院分区：
文献类型：
--
作者：
Sun, Xue;Cao, Suzhi
研究基于波分复用星间链路的低轨星间激光通信及其路由和波长分配（RWA）技术是解决自由空间光通信低时延、大容量、高速率传输和低成本在轨实时路由问题的重要途径。由于星间通信的发射端和接收端都是高速运动的卫星，因此整个星间通信过程中的网络拓扑结构是时变的。因此，基于这一特殊性，本文提出了SpacePro星座，并结合经典的NeLS星座进行数学建模，对网络拓扑和星间链路进行了全周期的预测和分析。提出了具有计算和存储功能的超级卫星节点下的RWA算法（SCSA），并从波长资源需求和连通性两个方面对其效果进行了比较和分析。结果表明，SCSA算法可以节省高达50%的波长需求，SpacePro星座可以在比NeLS更少的星上处理器和波长的情况下达到相同的网络连通效果。卫星光网络节点的连通性和波长需求是一个权衡问题。研究该场景下的RWA问题，对于未来卫星光网络如何进行波长使用配置，帮助提高网络性能具有非常重要的参考意义。
Research on LEO inter-satellite laser communication based on wavelength division multiplexing inter-satellite links and its routing and wavelength assignment (RWA) technology is an important way to solve the problem of low-latency, high-capacity, high-speed transmission, and low-cost on-orbit real-time routing of free-space optical communications. Since both the transmitting and receiving sides of the inter-satellite communication are high-speed moving satellites, the network topology in the whole inter-satellite communication process is time-varying. Therefore, based on this particularity, we propose the SpacePro constellation and combined the classical NeLS constellation for mathematical modeling, and the network topology and inter-satellite links are predicted and analyzed in their entire cycles. The RWA under the super satellite nodes with computation and storage functions algorithm (SCSA) is proposed and its effect is compared and analyzed in the wavelength resource requirement and connectivity. The results showed that the SCSA algorithm can save up to 50% in wavelength requirements, and the SpacePro constellation can achieve the same network connectivity effect with fewer on-board processors and wavelengths than NeLS. Satellite optical network node connectivity and wavelength demand are a trade-off problem. Studying the RWA problem in this scenario has a very critical reference for how the future satellite optical network performs wavelength usage configuration to help improve the performance of networks.