关键词: 星间路由, 多路径路由, 可靠传输, 分段路由

Abstract: Due to limited resources and weak performance, satellite networks are difficult to effectively carry high-reliability, low-latency industrial control business flows (such as power grid multi-source survey and equipment control, etc.). From the perspective of multi-service differentiated scheduling, an "avoidance" lightweight and highly controllable inter-satellite segment routing mechanism (AVSR, Avoidance Segment Routing) is proposed: first, using snapshot technology or inter-satellite distributed routing The protocol obtains the topology information of the entire network. Secondly, the high-priority path is calculated based on the distribution characteristics of risk nodes in the original SPF (Shortest Path First) path. If risk nodes are clustered and distributed, they are regarded as continuous risk areas, and link weights are adjusted to avoid these areas. If the risk nodes are hashed, use them as breakpoints to cut the original SPF path into several path segments, and then reconnect them through detours. Finally, SRv6 (Segment Routing over IPv6) technology is used to accurately specify the path. In view of the limited inter-satellite bandwidth, the calculation amount of dynamic and static topology conversion in snapshot mode is large. We also designed a lightweight SRH (Segment Routing Header) compression algorithm that adapts to different topological characteristics. By bisecting it with the original SPF path Comparison, expanding the search range of connected paths, etc. seek simpler node stacking methods, which reduce the calculation overhead and SRH header overhead. Experiments show that the average compression rate of AVSE's SRH can reach 55%, and the average memory occupied is always no more than 3.5MB.

Key words: inter-satellite routing mechanism, multi-path routing, reliable transmission, segment routing